Handicap (chess)

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Initial setup for pawn and move: Black starts without the f-pawn; the weaker player (White) moves first.
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Initial setup for queen rook in exchange for the opponent's queen knight: White starts without the a-rook; Black, on the other hand, removes their b8-knight and moves their queen rook to b8. The stronger player (White) moves first.

Handicaps (or "odds") in chess are handicapping variants which enable a weaker player to have a chance of winning against a stronger one. There are a variety of such handicaps, such as material odds (the stronger player surrenders a certain piece or pieces), extra moves (the weaker player has an agreed number of moves at the beginning of the game), extra time on the chess clock, and special conditions (such as requiring the odds-giver to deliver checkmate with a specified piece or pawn). Various permutations of these, such as "pawn and two moves", are also possible.

Contents

Handicaps were quite popular in the 18th and 19th centuries, when chess was often played for money stakes, in order to induce weaker players to play for wagers. Today handicaps are rarely seen in serious competition outside of human–computer chess matches. As chess engines have been routinely superior to even chess masters since the late 20th century, human players need considerable odds to have practical chances in such matches – as of 2024, approximately knight odds for grandmasters. [1]

History

According to Harry Golombek, "Odds-giving reached its heyday in the eighteenth century and the early nineteenth century." [2] Indeed, it was so prevalent in the 18th century that Philidor (1726–1795) played the vast majority of his games at odds. [2] About fifteen percent of the known games of Paul Morphy (1837–1884) are games in which he gave odds. [3] Other strong odds-givers of this time were George Henry Mackenzie (1837–1891) and Wilhelm Steinitz (1836–1900). [1]

Howard Staunton in The Chess-Player's Handbook (1847) advised inexperienced players to accept odds offered by superior players and, upon improving to the point that they can themselves give odds to some players, to avoid playing such players on even terms, warning that doing so is apt to induce "an indolent, neglectful habit of play". [4] In 1849, Staunton published The Chess-Player's Companion, a 510-page work "chiefly directed to the exposition of openings where one party gives odds". [5] Just over 300 pages were devoted to odds games: Book I (pages 1 to 185) contained games played at various odds, and most of Book V (pages 380–496) discussed various types of odds, including exotic and unusual ones. [6] The late-19th century chess opening treatise Chess Openings Ancient and Modern, by Edward Freeborough and Charles Ranken, included fourteen pages of analysis of best play in games played at odds of pawn and move, pawn and two moves, and either knight. [7]

Macon Shibut writes that in the mid-19th century "chess was a gambling game ... . Individual matches for stakes were the focus of organized play. Matches between leading players attracted a wide following so masters often succeeded in finding sponsors to back their personal wagers." [8] However, the available sums were generally relatively meager, and travel was arduous, so the amount of money obtained in this way was not sufficient to enable professional chess players to support themselves financially. [8] Moreover, the first major chess tournament was not organized until 1851, [9] and chess tournaments remained a rarity for several decades following. [10] With tournaments an unreliable means of making a living, odds-giving became a way for masters to entice amateurs into playing for wagers, since the odds gave the amateur a fighting chance. [8] [11] [12] The odds system even became the earliest rating system: amateurs were graded according to what handicap they needed to compete against a master, and were referred to as a "Rook player" or "Pawn and move player", for example, as many people would today speak of players by their Elo ratings (e.g. a "1200 player" or an "1800 player"). [13]

The playing of games at odds gradually grew rarer as the nineteenth century proceeded. [2] Today, except for time odds, they have all but disappeared. [14] Shibut posits that games played at material odds became unpopular for (1) technological, (2) political, and (3) philosophical reasons. Taking these in turn, first, the introduction of chess clocks gave rise to a new way to give odds, one that has today supplanted material odds as the preferred mode of odds-giving. Second, the Soviet Union supported chess masters and sponsored chess education, but expected chess masters "to be cultural icons, not hustlers". Third, chess began to be treated in a scientific, logical way, "with an assumption of idealized 'best play' [coming] to underpin all analysis". From this perspective, a game beginning from a "lost" position becomes less interesting, even distasteful. [15] Writings by Wilhelm Steinitz (1836–1900), the first World Champion, and James Mason (1849–1905) are consistent with the last point. [16] [17] GM Larry Kaufman argued in 2024 that another factor was that chess became more popular and the standard of play rose, so that it was no longer reasonable to give piece odds to strong players. [1]

World Chess Champion Bobby Fischer often gave odds, as did IM Israel Albert Horowitz before him. Against FIDE Master Asa Hoffmann, Fischer first gave pawn and move (f7), then pawn and two moves, and then pawn and three moves. [1] In an interview with Ralph Ginzburg published in the January 1962 issue of Harper's Magazine , Bobby Fischer was quoted as saying that women were weak chessplayers and that he could successfully give knight odds to any woman in the world. [18] [19] [20] Fischer later claimed that Ginzburg had distorted what he had said. [21]

In 2001, London businessman Terence Chapman, a master-level player, played a match against former World Champion Garry Kasparov, with Kasparov giving odds of two pawns in each game (the pawns removed were different each time); Kasparov won the match by two games to one, with one draw. [22]

Rybka, a top-rated computer chess engine designed by International Master Vasik Rajlich, played a series of handicap matches against strong human players. In March 2007, Rybka defeated Grandmaster Jaan Ehlvest after giving pawn odds (removing a different pawn each time). [23] In January 2008, Rybka defeated Grandmaster Joel Benjamin after giving draw odds. [24] In March 2008, Rybka gave pawn and move (removing a different pawn each time) to Grandmaster Roman Dzindzichashvili, drawing the match 4–4. [25] In June 2008, Rybka gave knight odds to FIDE Master John Meyer, losing 4–0. [26] [27] On July 6, 2008, Rybka gave Meyer odds of pawn and three moves, winning 3–1. [28] [29] In 2015, Komodo (co-authored by Don Dailey and Larry Kaufman) defeated strong grandmasters at the f7-pawn handicap and rook (a1) for knight (b8), without losing a single game. [1]

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Initial setup for the "Knightmare" position. White has all knights, while Black has no knights.

Top human players still occasionally play odds matches against engines. In 2016, Komodo played Hikaru Nakamura in four odds games, giving pawn & move odds, pawn odds, exchange odds, and 4-move odds. The first three ended drawn, while Komodo won the last game to win the match 2.5-1.5. [30] In 2018, Komodo played another handicap series against Maxime Vachier-Lagrave. Komodo won four games at pawn and two moves odds, two-pawn odds, queen for rook + queen's knight odds, and knight for f7-pawn odds. Maxime Vachier-Lagrave won at odds of exchange and pawn for knight, while the last "Knightmare" game (diagram) was drawn. [31] Finally, in 2020, Komodo played a 6-game match against GM David Smerdon at knight odds. GM Smerdon blundered away the first game, but rallied to win the remaining five. [32]

From 9 November 2023, Leela Chess Zero supports playing at knight odds (b1 or g1) on Lichess. [33] Against "par" grandmasters (Elo around 2500), the bot scored +24 −5 =2. Kaufman suggests that "only an 'elite' grandmaster could win a rapid match from LeelaKnightOdds". [1] Later, queen for knight odds (LeelaQueenForKnight) and queen odds (LeelaQueenOdds) were also added, along with the option to play as either colour (i.e. knight and move, queen for knight and move, and queen and move) [1] Rook odds were added on 29 February 2024, with the choice of rook (a-file or h-file) and colour. Two knights odds and rook and knight odds are planned to be supported in future. [34] LeelaKnightOdds played a ten-game knight odds blitz match against GM David Navara on 30 March 2024, alternating between the b1 and g1 knights: the first two games were at 5+3, the next four at 3+2, the next two at 3+1, and the last two at 3+2 again. Navara won 7–3 (+6 =2 −2). [35]

Kaufman argues that odds chess is excellent for training. He argues that if a master plays a weaker student for training, then the following options are available, and he finds the last one preferable: [1]

Handicaps

The purpose of a handicap, or odds, is to compensate for the difference in skill between two chess players. [11] [36] [37] There are a variety of handicaps: material odds; extra moves; time odds; special restrictions (such as pion coiffé); weighting of results (such as "draw odds" – counting a draw as a loss for the odds-giver); differential stakes; and physical restrictions, such as blindfold chess. [11] [15] Many different permutations of handicaps (for example, a material handicap plus time odds) are also possible, [38] [39] as are countervailing handicaps (for example, a player gives up a piece, but receives one of the opponent's pieces or pawns and/or extra moves, in return). [40] [41] [42]

Main

The following list is based on that of Larry Kaufman, mostly describing the 19th-century situation. [1] [43]

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Black to move. White mates in two moves regardless of what Black plays.

Even with the "no moves beyond the fourth rank" proviso, Black cannot give White an unlimited number of moves. Doing so would allow White to set up the position at right, when White's dual threats of 1.Qxf7# and 1.Ned6+ cxd6 2.Nxd6# are immediately decisive. [49] Kaufman also points out that pawn and four moves is already problematic due to 1.e3 2.Bd3 3.Qg4 4.Nc3, and now Black is forced to give up the e-pawn and trade queens. [50]

For the modern era, Kaufman advocates the following list: [1]

HandicapEvalNotes
Odds of the move0.17
Two moves (1.e4 and White to move again)0.48White is better, but objectively this is not a winning advantage. However, three moves (1.e4 2.d4 and White to move again) would be. [51]
Pawn (remove f2)0.71
Pawn and move (remove f7)1.20
Pawn and two moves (remove f7, 1.e4 and White to move again)1.59
Two pawns (remove c7 and f7)2.03To replace the historically unpopular pawn and three moves; odds of two pawns gives a more normal game.
Knight for second move (remove either b1 or g1, 1.e4 and White to move again)2.44
Knight (remove b1 or g1)2.81For a match, alternate the knight removed. Kaufman calls this "the critical handicap between engines and grandmasters", and notes that it is also useful and important between good players. It is a smaller handicap to give the g1-knight.
Knight and move (remove b8 or g8)3.28Historically rare, but fills the large gap between knight and rook odds.
Rook (remove a1)3.700-0-0 is not allowed; the a-pawn starts on a2.
Rook and move (remove a8)4.07
Rook and pawn (remove a1 and f2)4.48
Queen for knight (remove d1 and b8)5.21Replaces Morphy's preferred and comparable rook, pawn, and move (remove a8 and f7), as this produces a more normal game.
Queen for knight and move (remove d8 and b1)5.48Replaces Morphy's preferred and comparable rook, pawn, and two moves (remove a8 and f7, 1.e4 and White to move again), as this produces a more normal game.
Two knights (remove b1 and g1)5.64
Two knights and move (remove b8 and g8)5.84
Rook and knight (remove a1 and b1)6.59
Rook, knight, and move (remove a8 and b8)6.76
Rook, knight, and pawn (remove a1, b1, and f2)7.33
Rook, knight, pawn, and move (remove a8, b8, and f7)7.56
Queen (remove d1)7.95
Queen and move (remove d8)8.20
Queen and pawn (remove d1 and f2)8.80
Queen, pawn, and move (remove d8 and f7)9.08
Queen, pawn, and two moves (remove d8 and f7, 1.e4 and White to move again)9.44

Kaufman mentions even greater handicaps, such as queen and knight; queen and two knights; and queen and two rooks. [1]

Others

Some other rarer material odds are mentioned by Harry Golombek: [2]

I.A. Horowitz also notes: [45]

Time handicaps are most often practised in blitz games. The stronger player may be given one or two minutes to play the whole game, while the weaker player receives five minutes or more. Money odds are another way of compensating for a difference in strength; the stronger player puts up some multiple (three, five, ten, etc.) of the amount of money put up by the weaker player. [52] [53]

In the 16th–19th centuries pion coiffé (capped or marked pawn) handicapping was sometimes used. The stronger player must checkmate with a particular pawn, which is usually marked at the start of play. The pawn cannot be promoted; giving checkmate with any other pawn or piece loses the game. Pion coiffé is considered to be about equivalent to giving odds of a queen. [54] Similarly, games have occasionally been played with a ringed piece, where a ring or band is placed around a particular piece, and the player giving odds must checkmate with that piece. [55] [56] [57] This form of odds, along with pion coiffé, are very difficult for the odds-giver, who cannot allow the odds-receiver to sacrifice for the capped or ringed piece or pawn. [58] [59] For instance, in pion coiffé, after 1.e4 d5 2.exd5 Qxd5, Black already threatens to sacrifice the queen for the capped pawn if it is the a-, d-, or g-pawn, to play 3...Qe5+ followed by such a sacrifice if it is the b- or h-pawn, or to play 3...Qe4+ followed by a sacrifice if it is the c-pawn.

Staunton also mentioned the following unusual forms of odds not discussed by Carrera:

Opening theory

Kaufman provides the following lines of pawn and move opening theory, analysed using Leela Chess Zero. He only considers 1.e4, noting that it is "clearly the best move" in this handicap. [43]

French Defense

1. e4 e6 2. d4 An alternative is 2.Nc3, which prevents the French due to Qh5+ after the trade. In the case of 2...Bb4 3.Qh5+ g6 4.Qe5 Nf6 5.Nd5 0-0 6.Nxf6+ Qxf6 7.Qxf6 Rxf6 8.c3 Be7 9.d4, White has traded queens, kept the pawn advantage, and secured central control. Black could also enter a Taimanov Sicilian with 2...c5 3.Nf3 Nc6 4.d4 cxd4 5.Nxd4 Qc7 6.Be3 a6 7.f4, where the missing f-pawn necessitates some unnatural development on Black's part. [43] 2... d5 3. Nc3 Also possible is the Tarrasch Variation: 3.Nd2 c5 4.exd5 exd5 5.Bb5+ Bd7 6.Qh5+ g6 7.Bxd7+ Qxd7 8.Qe5+ Qe7 9.Qxe7+ Bxe7 10.dxc5 Bxc5 11.Ngf3 Nf6 12.0-0 0-0 13.Nb3 Bb6 14.Re1 produces a normal Tarrasch endgame against a Black isolated queen pawn, but where White is up a pawn. [43] 3... Bb4 4. exd5 exd5 5. Qh5+ g6 6. Qe5+ Qe7 7. Bf4 Nc6 8. Qxe7+ Ngxe7 9. Bxc7 0-0 Also possible is 9...Nxd4 10.0-0-0 Bxc3 11.bxc3 Ndc6 12.Nf3, conceding the bishop pair: White is better developed. 10. Nge2 Be6 11. a3 Rac8 12. Bg3 White is securely up two pawns. [43]

Nimzowitsch Defense

1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. Nf3 Nxf3+ An alternative is 4...Qf6 5.Nc3 Bb4 6.Bd2 Nxf3+ 7.Qxf3 Qxf3 8.gxf3 Ne7 9.0-0-0, where White has advantages in material, space, and development. 5. Qxf3 Bd6 6. Nc3 Nf6 7. Bf4 Bxf4 8. Qxf4 d6 9. Bc4 Bd7 10. 0-0-0 Qe7 11. Rhe1 0-0-0 12. e5 dxe5 13. Rxe5 Qf8 14. f3 White has a large advantage in development and has kept the extra pawn. [43]
1. e4 Nc6 2. d4 d5 3. e5 This is good because the normal undermining move ...f6 is not available. 3... Bf5 4. c3 e6 5. Ne2 g5 6. Ng3 Bg6 7. Be2 In addition to spatial and material advantages, White has secured control over the important square h5. [43]

Philidor Defense

1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nc6 5. h3 Be7 6. Bc4 Na5 7. Bb5+ Bd7 8. dxe5 dxe5 9. Bxd7+ Qxd7 10. Qxd7+ Nxd7 11. Nd5 Bd6 12. Ke2 0-0-0 13. Rd1 In addition to the initial material advantage, White has the good bishop, a strongly positioned knight on the outpost d5, and a better positioned king for the endgame. [43]

Pirc Defense

1. e4 d6 2. d4 Nf6 3. Nc3 e6 4. Nf3 Be7 5. Bb5+ c6 6. Bd3 0-0 7. 0-0 Na6 8. a3 White has developed better and secured central control, in addition to the extra pawn. [43]

Sicilian Defense

1. e4 c5 A gambit once played by Alexander Alekhine, but Black has very little compensation for being two pawns down after 2. Qh5+ g6 3. Qxc5 e6 4. Qe3 Bh6 5. Qa3. [43]

Adams Defense

1. e4 Nh6 Intending to post the knight on f7, the best square possible. 2. d4 Nf7 3. Be3 e6 4. a3 Be7 5. Nc3 0-0 6. Bd3 d6 7. f4 Nd7 8. Nf3 c5 9. Qe2 cxd4 10. Nxd4 Nb6 11. 0-0 e5 12. fxe5 Nxe5 13. Rxf8+ Bxf8 14. h3 White has a large advantage in development and has kept the extra pawn. [43]

Rating equivalent

In 2008, Kaufman wrote the following about the Elo rating equivalence of giving knight odds: [71]

[T]he Elo equivalent of a given handicap degrades as you go down the scale. A knight seems to be worth around a thousand points when the "weak" player is around IM level, but it drops as you go down. For example, I'm about 2400 and I've played tons of knight odds games with students, and I would put the break-even point (for untimed but reasonably quick games) with me at around 1800, so maybe a 600 value at this level. An 1800 can probably give knight odds to a 1400, a 1400 to an 1100, an 1100 to a 900, etc. This is pretty obviously the way it must work, because the weaker the players are, the more likely the weaker one is to blunder a piece or more. When you get down to the level of the average 8 year old player, knight odds is just a slight edge, maybe 50 points or so.

Kaufman has written that Kasparov could give pawn and move odds to a weak grandmaster (2500 FIDE rating) and be slightly favored, and would have even chances at knight odds against a player with a FIDE rating of 2115. [72]

In 2024, Kaufman provided a more detailed table, giving rating equivalents for a fair game (based on Chess.com ratings at 10+10 rapid; classical ratings would be 200 points higher, and blitz 3+2 or 5+0 ratings would be 200 points lower). He wrote that players below 1600 or above 2000 should "look for the same Elo difference" between opponents in the table. Ratings above 2900 would only apply for engines; perfect play for engines is expected to be 4000. [1]

160018002000Odds160018002000
gives odds to...receives odds from...
158217801974Odds of the move161818212027
155117411928Two moves (1.e4 and White to move again)165218632078
152817131895Pawn (f2)167718952117
148116571829Pawn (f7) and move173419662206
144616151779Pawn (f7) and two moves (1.e4 and White to move again)178220272282
140715691725Two pawns (c7 and f7)183820992382
137215281678Knight for second move (White starts without a knight, but starts 1.e4 and then moves again)189521722474
134114931637Knight (either)194922422570
130414491587Knight (either) and move201923392705
127114111544Rook (a1)208824352846
124313801508Rook (a8) and move215325252987
121413471470Rook (a1) and pawn (f2)222926403167
116312881404Queen (d1) for knight (b8)238228783604
114412681381Queen (d8) for knight (b1) and move244529803833
113412551368Two knights (b1 and g1)248430484000
112012401351Two knights (b8 and g8) and move25353136
107211881291Rook (a1) and knight (b1)27553573
106211751278Rook (a8), knight (b8), and move28113705
102711361236Rook (a1), knight (b1), and pawn (f2)3028
101311211219Rook (a8), knight (b8), pawn (f7), and move3132
99110961191Queen (d1)3333
97610801174Queen (d8) and move3488
94310421133Queen (d1) and pawn (f2)4000
92810261115Queen (d8), pawn (f7), and move
90810051092Queen (d8), pawn (f7), and two moves (1.e4 and White to move again)

Kaufman also gave the following ratings and handicaps to equalise chances against Magnus Carlsen (whose rating was rounded to Elo 2900) in rapid (10+10): [1]

OddsElo
None2900
Pawn (f2)2600
Pawn (f7) and move2500
Pawn (f7) and two moves2400
Knight (especially g1)2200
Rook (a1)2000
Queen (d1) for knight (b8)1800
Rook (a1) and knight (b1)1600
Queen (d8) and move1400
Queen (d1) and knight (b1)1200
Queen (d1) and two knights (b1 and g1)1000

The faster the time limit, the larger the handicap needed at the same rating difference. Kaufman writes that the necessary handicap for a 3-minute blitz game is about double the necessary handicap for a slow classical game, assuming the same players in each. [1]

Illustrative games

Pawn and move

This game was won by Siegbert Tarrasch, whom Assiac described as "one of the greatest experts of 'Pawn and move' theory": [61] [73]

Eckart vs. Tarrasch, 1887–88
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Position after 13...Rxd4
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Position after 16.Nc3

K. Eckart vs. Tarrasch, Nuremberg Chess Club Championship 1887–88 (remove Black's f-pawn)
1. e4 Nc6 2. f4 e5 3. Nf3 exf4 4. Bc4 Bc5 Planning the following unsound but tricky sacrifice. 5. d4 Nxd4?! 6. Nxd4 Qh4+ 7. Kf1 d5 Sacrificing another pawn for rapid development . 8. exd5 Bg4 9. Bb5+? Evidently overlooking Black's next move. Correct was 9.Qd3, with a satisfactory defense. c6! 10. dxc6 0-0-0! 11. cxb7+ Kxb7 12. Bc6+ Kb6 13. Qd3 Rxd4 Black has regained the sacrificed piece and, contrary to appearances, his king is quite safe. 14. Qb5+ Kc7 15. Qb7+ Kd6 16. Nc3 Allowing a pretty finish, but 16.Bf3 Rd1+! 17.Ke2 (17.Bxd1 Qf2#) Bxf3+ 18.Qxf3 Rxh1 also wins for Black. Qf2+! 17. Kxf2 Rd1+ (discovered check) 18. Be3 Bxe3# 0–1 Notes based on those by Fred Reinfeld. [74]

Pawn and two moves

Daniel Harrwitz vs. Howard Staunton, 1846 (remove Black's f-pawn)
1. e4 2. d4 2.Nc3 is better. e6 3. c4 3.Nc3! is better: 3...Bb4 4.Bd3 Nc6 5.e5 Qe7 6.Nf3 d5 7.0-0 gives White better development, a spatial advantage, and better king safety (Black will probably be unable to safely castle on either wing) in addition to his extra pawn. c5 4. d5 d6 5. f4 g6 6. Nf3 Bg7 7. Nc3 Ne7 8. Bd3 Na6 9. 0-0 0-0 10. h3 Nc7 11. Qc2?! 11.a4! is better. a6?! Better was 11...b5! 12.dxe6 bxc4 13.Bxc4 Bxe6, where although Black is still lost, he has more play than he would typically have at pawn and two moves handicap. 12. a4 Bd7 13. Be3 Rc8 14. Rad1 Better is 14.a5! exd5 15.cxd5 Nb5 16.Qb3 with decisive advantage to White. exd5 15. cxd5 Ne8 16. b3 Qa5 17. Ne2 b5 18. axb5 axb5 19. Rc1 Qa3 20. Nd2 20.Bf2! gives a decisive advantage. Qa5 21. Bf2 Nc7 22. Bh4 Rf7?! 22...Rce8 is a bit better. 23. Bxe7? A blunder, conceding the bishop pair for a poorly placed knight even though the position is open, though this may not have been well-understood in 1846. Rxe7 24. Nf3 Na6 25. Kh2? 25.e5! was necessary to preserve the winning advantage. c4? Better was 25...Nb4 26.Qd2 Qa2 27.Qd1 Nxd3 28.Qxd3 Qa3 where Black threatens c4, and has a bishop pair for a knight pair and a pawn. Black has reduced his disadvantage to what it usually would be in normal chess, and thus should win given that the handicap implies a strength difference. 26. bxc4 bxc4? 26...Qa3 27.Qd1 Nb4 28.Bb1 bxc4 would give practical compensation for the missing pawn, though White still stands better. 27. Bxc4 Bb5 28. Qb3 White is up two pawns and has a decisive advantage. Ba4 29. Qe3 Bb2 30. Bxa6 Bxc1 31. Rxc1 Rxc1 32. Qxc1 Qxa6 33. Ng3 Qb7 34. f5 Be8 35. Qg5 Rg7 36. f6 Rd7 37. Nf5 Kh8 38. Ne7 Qb2 39. e5 dxe5 40. f7 1–0 Notes based on those by Larry Kaufman. [43]

Even though Staunton lost, he missed some chances, and Harrwitz was a very strong player in his own right. This game was part of a pawn and two moves match, which Staunton won 4–3. [43]

Knight odds

Zukertort vs. Epureanu, 1872
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Position after 19...Ne7
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Final position; Black, ahead a queen, bishop, and knight, is defenseless.

Johannes Zukertort vs. Epureanu, Berlin 1872 (remove White's queen knight)
1. f4 e6 2. Nf3 Nf6 3. b3 d5 4. Bb2 c5 5. e3 Nc6 6. a3 a6 7. Bd3 Bd6 8. Qe2 0-0 9. g4 Nxg4? Imprudently allowing White to attack Black's king along the g-file. 10. Qg2 Nf6 11. h4 h6 12. h5 Kh8 13. 0-0-0 Ne8 14. Rdg1 Rg8 15. Bh7!! f6 (15...Kxh7 16.Qg6+!! fxg6 17.hxg6+ Kh8 18.Rxh6#) 16. Bxg8 Kxg8 17. Qg6 Kh8 18. Ng5! hxg5 19. fxg5 Ne7 20. gxf6!! Nxg6 21. hxg6+ Kg8 22. Rh8+! Kxh8 23. f7 1–0 There is no defense against mate. If 23...Qh4 (stopping the threatened 24.Rh1+), 24.fxe8(Q)+ Bf8 25.Qxf8#. Francis J. Wellmuth calls this "the finest odds-game ever played". Irving Chernev and Fred Reinfeld call the conclusion "the finest finish in this type of contest." Notes by Chernev and Reinfeld, Wellmuth, and Napier. [75] [76] [77] [78]

Rook odds

Kashdan vs. Horneman, 1930
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Position after 13...f6?
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Final position after 16.Ng7#

Isaac Kashdan vs. Buster Horneman, Manhattan Chess Club 1930 (remove White's queen rook)
1. e4 e6 2. d4 d5 3. e5 c5 4. Qg4 cxd4 5. Nf3 Nh6 6. Qh3 Be7 7. Bd3 b6 8. Qg3 Nf5 9. Bxf5 exf5 10. Qxg7 Rf8 11. Nxd4 Ba6? 12. Nxf5 Nd7 13. Bg5 f6? 14. e6! fxg5 15. Qg6+!! hxg6 16. Ng7# 1–0 [45] [79] [80]

It would be a mistake to suppose that the odds-giver always wins. Even the strongest players sometimes meet with disaster:

Morphy vs. Maurian, 1855
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Position after 9.Qe2
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Final position after 12...Ng4#

Paul Morphy vs. Charles Maurian, Springhill 1855 (remove White's queen rook)
1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 b5 5. Bd5 Nc6 6. Nf3 Qh5 7. d4 Nf6 8. Bb3 Ba6 9. Qe2 Nxd4! 10. Nxd4 b4! 11. Qxa6?? Qd1+ 12. Kf2 Ng4# 0–1 [81] [82]

Queen odds

Apšenieks vs. Amateur, 1934
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Position after 21...Rad8
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Final position after 25.Nh6#

Apšenieks vs. Amateur, Riga 1934 (remove White's queen)
1. b3 e5 2. Bb2 d6 3. Nc3 Be7 4. 0-0-0 Nf6 5. f3 0-0 6. e3 c6 7. g4 h6 8. Nge2 Be6 9. Ng3 Nbd7 10. h4 Nh7 11. g5 hxg5 12. hxg5 Bxg5 13. Bd3 Bh6 14. Rdg1 d5 15. Nf5 Bxf5 16. Bxf5 Qf6 17. Bxd7 d4 18. exd4 exd4 19. Ne2 Qe7 20. Nxd4 Qxd7 21. Rxh6 Rad8 22. Rxg7+! Kxg7 23. Nf5+ (double check) Kg8 24. Rg6+! fxg6 25. Nh6# 1–0 [83]

Ringed piece

Lange vs. von Schierstedt, 1856
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Position after 14.Raf1
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Final position: the ringed knight mates.

Max Lange vs. Jenny von Schierstedt, Halle 1856 (White's queen knight is the ringed piece with which he must checkmate)
1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. 0-0 gxf3 7. d4 fxg2 8. Bxf7+ Kxf7 9. Qh5+ Kg7 10. Rxf4 Nh6 11. Be3 d6 12. Ne2 Qe7 13. Kxg2 Be6 14. Raf1 Bf7? Black could have won with 14...Qg5+!!, when 15.Qxg5# would checkmate Black, but violate the stipulation that the queen knight must checkmate. [84] 15. Qxh6+!! Kxh6 16. Rg4+ Kh5 17. Ng3+ Kxg4 18. Rf5 h6 19. h3+ Kh4 20. Rh5+ Bxh5 21. Nf5# 1–0 [55] [56] [57]

Pion coiffé

Staunton vs. Taverner
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Position after 3.Ng3; White guards the capped pawn against frontal attack.
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Final position; the capped pawn gives mate.

Howard Staunton vs. Taverner?, date unknown (White's pawn on g2 is the capped pawn, with which he must give checkmate) [85]
1. Nc3 e5 2. Ne4 d5 3. Ng3 Covering the pawn to make it less assailable by Black's pieces. f5 4. e3 Bd6 5. c4 h5 6. Nxh5 Qg5 7. Ng3 f4 8. exf4 Not 8.Nf3??, when 8...Bh3! would win the g-pawn and the game. exf4 9. d4 Qg6 10. Bd3 Qh6 Now Black threatens 11...Qh3! and wins. 11. Qh5+ Qxh5 12. Nxh5 Rxh5 13. Bg6+ Ke7 14. Bxh5 Nf6 15. Bf3 g5 16. c5 g4 17. cxd6+ cxd6 18. Bxg4 Bxg4 19. Bxf4 Nh5 20. Bg3 Nc6 21. h3 21.f3? Be6 22.Ne2 Rg8 23.Kf2 Bh3! 24.gxh3 Nxg3 followed by 25...Rh8 would win the capped pawn. Be6 22. Ne2 Rg8 23. Rc1 Bf5 24. Rc3 Be4 25. Re3 Nb4 26. Kd2 Nxa2 27. Ra1 Nb4 28. Rxa7 Nc6 29. Rxb7+ Ke6 30. Rh7 Rg5 31. Rxe4+ dxe4 32. Rxh5 Rxh5 33. Nf4+ Ke7 34. Nxh5 Nxd4 35. Ke3 Nc2+ 36. Kxe4 Ne1 Attacking the "game pawn". 37. Bh4+ Kd7 38. g4 Kc6 39. f4 Nc2 40. f5 d5+ 41. Kf4 d4 42. Bf2 d3 43. Be3 Nd4 44. Ke4 d2 45. Bxd2 Nb3 46. Be3 Kd6 47. Nf6 Kc6 48. h4 Na5 49. h5 Nc4 50. Bf4 Nxb2 51. h6 Na4 52. h7 Nc5+ 53. Ke3 Kb5 54. Ne4 Na6 55. h8=Q Ka5 56. Qc3+ Kb5 57. Qb3+ Ka5 58. Nc3 Nc5 59. Bc7+ Ka6 60. Qb5+ Ka7 61. Qxc5+ Ka6 Deliberately allowing checkmate. 62. Qa5+ Kb7 63. Ke4 Kc8 64. Qa7 Kd7 65. Qb7 Ke7 66. Qc8 Kf6 67. Bd8+ Kg7 68. Qe6 Kf8 69. Qe7+ Kg8 70. Nd5 Kh8 71. g5 Kg8 72. g6 Kh8 73. Ke5 Kg8 74. Nf6+ Kh8 75. g7# 1–0 Notes by Staunton, who wrote that he and his opponent played many games at these odds, of which this was "perhaps the weakest, but ... also the shortest". [86] [87]

Odds of queen

Paris vs. Marseilles, 1878
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Position after 67.Kb1
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Final position; Black, having forced White to give checkmate, wins.

In response for receiving the queen, Black undertakes to force White to checkmate Black.

Paris vs. Marseilles, correspondence 1878 (remove White's queen)
1. d4 d5 2. Nc3 c6 3. Nf3 g6 4. e4 e6 5. e5 Bb4 6. Bd2 Bxc3 7. Bxc3 b5 8. h4 h5 9. 0-0-0 a6 10. Ng5 f5 11. g3 Nh6 12. Bd3 Nf7 13. Bxf5? gxf5 14. Nxf7 Kxf7 15. Bd2 Nd7 16. Rhe1 c5 17. dxc5 Nxc5 18. Bg5 Qg8 19. Re3 Bb7 20. Rc3 Rc8 21. Be3 Nd7 22. Bd4 Rxc3 23. bxc3 a5 24. Kd2 a4 25. Rb1 Ba6 26. Rg1 Qg4 27. Rb1 Rc8 28. Rb4 Rc4 29. Rxc4 dxc4 30. a3 f4 31. Kc1 fxg3 32. fxg3 Qxg3 33. Kb2 Qxh4 34. Kc1 Qe1+ 35. Kb2 Qd1 36. Ba7 Nxe5 37. Bc5 h4 38. Bd4 Nc6 39. Be3 e5 40. Bf2 h3 41. Bg3 e4 42. Bf4 Ke6 43. Bg3 e3 44. Bf4 e2 45. Bg3 Kd7 46. Bh2 e1=Q 47. Bf4 Qee2 48. Bg3 Qdxc2+ 49. Ka1 Qf1+ 50. Be1 Qd2 Now White is reduced to shuffling the king back and forth while Black sets up self-mate. 51. Kb1 h2 52. Ka1 h1=Q 53. Kb1 Qf8 54. Ka1 Qxa3+ 55. Kb1 Qad6 56. Ka1 Qf6 57. Kb1 Kc7 58. Ka1 b4 59. Kb1 b3 60. Ka1 Kb6 61. Kb1 Ka5 62. Ka1 Ne7! 63. Kb1 Nc8 64. Ka1 Bb5 65. Kb1 Qa6! 66. Ka1 Nb6 67. Kb1 Qh7+ (not 67...Qhxe1#??, when White wins) 68. Ka1 Qxc3+! 69. Bxc3# The only legal move. 0–1 Black, having forced White to checkmate, wins. [88] [89]

See also

Notes

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Kaufman, Larry (January 2024). "Against All Odds". New in Chess. New in Chess. pp. 70–77.
  2. 1 2 3 4 5 Harry Golombek, Golombek's Encyclopedia of Chess, Crown Publishers, 1977, p. 218.
  3. Macon Shibut, Paul Morphy and the Evolution of Chess Theory, Dover Publications, 2004, p. 121. ISBN   978-0-486-43574-9.
  4. Howard Staunton (1847). The Chess-player's Handbook. Bohn. p. 46.
  5. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, p. v.
  6. Books II and III were devoted to games not at odds, classified by opening, Book IV analyzed the games of Staunton's 1843 match against Saint Amant. The last chapter of Book V was devoted to chess problems.
  7. E. Freeborough and Rev. C.E. Ranken, Chess Openings Ancient and Modern, Third Edition, Kegan Paul, Trench, Trübner and Co., London, 1896, pp. 271–84. The authors, after discussing general principles applicable to odds games, devoted pages 274–76 to analyzing games played at pawn and move, pages 277–79 to pawn and two moves games, pages 281–82 to games played at queen knight odds, and page 283 to the unusual odds of king knight.
  8. 1 2 3 Macon Shibut, Paul Morphy and the Evolution of Chess Theory, Dover Publications, 2004, p. 122. ISBN   978-0-486-43574-9.
  9. "Indeed, it was not until the International Tournament of 1851, held at the Crystal Palace of the London Exhibition, that tournament play entered the chess scene." Robert Byrne "Chess", The New York Times , January 14, 1997. Accessed July 21, 2008.
  10. Reuben Fine writes that for Adolf Anderssen (1818–1879), winner of the 1851 tournament, "There were few tournaments (none at all from 1851 to 1857)". Reuben Fine, The World's Great Chess Games, Dover, 1983, p. 16. ISBN   0-486-24512-8. Similarly, for Wilhelm Steinitz (1836–1900), the first World Champion, "active tournaments were few and far between ... Steinitz could hardly find one every three or four years". Id. at 31. It was only during Emanuel Lasker's 1894–1921 reign as World Champion that "the institution of the chess tournament was really developed", with "half a dozen international tournaments a year and innumerable local ones". Id. at 49.
  11. 1 2 3 David Hooper and Kenneth Whyld, The Oxford Companion to Chess , Oxford University Press, 2nd ed. 1992, p. 166 ("handicap" entry). ISBN   0-19-866164-9.
  12. "It was the pernicious practice at the time [of Philidor] for the best players to give odds to weaker ones, no doubt as an inducement for them to play for wagers." Harry Golombek, Chess: A History, G.P. Putnam's Sons, 1976, p. 120.
  13. Macon Shibut, Paul Morphy and the Evolution of Chess Theory, Dover Publications, 2004, pp. 122–23. ISBN   978-0-486-43574-9.
  14. Shibut addresses the question "why has odds chess all but disappeared today?" Macon Shibut, Paul Morphy and the Evolution of Chess Theory, Dover Publications, 2004, pp. 122. ISBN   978-0-486-43574-9. He notes that, "Today, the game's gambling heritage is best preserved in the arena of blitz chess and, not coincidentally, we can still find oddsgiving in blitz. However, time odds have replaced material as the preferred form of handicapping." Id. at 124.
  15. 1 2 Macon Shibut, Paul Morphy and the Evolution of Chess Theory, Dover Publications, 2004, p. 124. ISBN   978-0-486-43574-9.
  16. Steinitz wrote:
    [A] learner should seek as much as possible to play on even terms with superior players. From experience and observation we feel sure that he will learn much faster in this manner than by taking odds. The latter method of practice engenders the habit on the part of the odds-receiver of exchanging pieces without any motive other than to reduce the forces. He may also with comparative impunity commit many mistakes anyone of which would surely cost him the game if he started on even terms, and the object of the student ought to be not so much to win games as to train himself to play correctly. By taking odds a players loses the opportunity to observe the finer points of play of his adversary who on account of his inferiority in force cannot always afford to adopt the best strategy and is more apt to resort to lines of play which he knows to be unsound, relying on the inability of the weaker player to perceive the correct reply. Moreover, the openings in games at odds are quite different from those adopted in even games and, therefore, the odds-receiver is not advancing in one important branch of Chess knowledge.
    Wilhelm Steinitz, The Modern Chess Instructor, Part I, Edition Olms Zürich, 1990 (reprint of 1889 work), pp. xxix–xxx. ISBN   3-283-00111-1.
  17. Mason wrote:
    Strictly speaking, odds play is somewhat foreign to the general principles of Chess, and, therefore, less conducive to improvement of the player—giver or receiver—than serious conduct of the game on proper even terms. This would be so for the weaker party, if only because correctness of development must needs be missing, the whole theory of the opening being distorted and disturbed; and it would be so, for the stronger party, if only because of the habit of speculative and unsound combination odds play so naturally induces—a habit which if once acquired is so difficult of rejection, and whose effects cannot fail to prove inconvenient to its subject, when confronted by a foeman entirely worthy of his steel, and calling for the full exercise of all his powers.
    James Mason, The Principles of Chess in Theory and Practice, David McKay, Fourth Edition, c. 1910, pp. 317–18.
  18. Ralph Ginzburg, "Portrait of a Genius as a Young Chess Master", Harper's Magazine, January 1962, pp. 49–55, at 50.
  19. Bobby Fischer quotes Archived 2007-10-26 at the Wayback Machine
  20. I. A. Horowitz and P. L. Rothenberg, The Complete Book of Chess, Collier Books, 1972, pp. 139–40.
  21. Fischer biographer Frank Brady wrote of the Ginzburg interview (not specifically addressing the part about women chessplayers) that Fischer "claimed emphatically that much in it had been twisted, distorted, and taken out of context". Frank Brady, David McKay, Profile of a Prodigy, Second Edition, 1973, p. 47.
  22. Kasparov makes it a knight to remember – Telegraph
  23. "Rybka–Ehlvest I". Archived from the original on 2023-06-27. Retrieved 2008-07-21.
  24. "Rybka–Benjamin match". Archived from the original on 2023-06-28. Retrieved 2008-07-21.
  25. "Rybka–Dzindzichashvili match". Archived from the original on 2023-04-13. Retrieved 2008-07-21.
  26. "Rybka–Meyer match conditions". Archived from the original on 2023-06-28. Retrieved 2008-07-21.
  27. Rybka–Meyer games
  28. "Rybka–Meyer II match conditions". Archived from the original on 2022-11-01. Retrieved 2008-07-21.
  29. Rybka–Meyer II games
  30. "Komodo beats Nakamura in final battle". chess.com. 13 January 2016.
  31. "MVL Battles Komodo In Close Match With Commentary". chess.com. 6 September 2018.
  32. "Breaking: Knight Slays Dragon". 15 April 2020.
  33. Naphthalin (9 November 2023). "Play with knight odds against Lc0 on lichess". lczero.org. Leela Chess Zero. Retrieved 23 December 2023.
  34. Naphthalin (11 February 2024). "Update on playing with piece odds against Lc0 on Lichess". lczero.org. Leela Chess Zero. Retrieved 6 March 2024.
  35. Matthew Sadler (2 April 2024). "GM David Navara – Leela Zero knight odds match on lichess!". matthewsadler.me.uk. Retrieved 6 March 2024.
  36. Pritchard, D. (1994). The Encyclopedia of Chess Variants. Games & Puzzles Publications. ISBN   0-9524142-0-1.
  37. Assiac, The Pleasures of Chess, Dover Publications, 1960, p. 147.
  38. For example, in 1747 Philidor won a match against Philipp Stamma in which Philidor gave move odds and draw odds in every game. H. J. R. Murray, A History of Chess, Oxford University Press, 1913, p. 862. ISBN   0-19-827403-3. By another account, Philidor gave draw odds and 5:4 money odds. David Hooper and Kenneth Whyld, The Oxford Companion to Chess (2nd ed. 1992), Oxford University Press, p. 303. ISBN   0-19-866164-9. According to a third account, he gave all of these: move odds, draw odds, and 5–4 money odds. Harry Golombek, Golombek's Encyclopedia of Chess, Crown Publishers, pp. 304–05. ISBN   0-517-53146-1.
  39. In 1914, future World Champion Alexander Alekhine played the famous composer Sergei Prokofiev blindfold and at knight odds. Prokofiev won handily in 31 moves. Andrew Soltis, Chess to Enjoy, Stein and Day, 1978, pp. 92–93. ISBN   0-8128-6059-4.
  40. Staunton gives the score of games where Kieseritzky gave odds of his queen rook in exchange for the opponent's queen knight, and Philidor gave odds of his queen rook in return for pawn and move. He also mentions odds of queen rook in exchange for pawn and two moves. Staunton, The Chess Player's Companion, Henry G. Bohn, 1849, pp. 409–12. Staunton also cites games where Philidor gave odds of queen knight in exchange for pawn and move, and in exchange for the first two moves. Id., pp. 435–40.
  41. Irving Chernev cites a game Andreaschek–Dr. R.M., Olmütz 1901, where White gave queen odds in return for the right to make the first six moves: 1.e4 2.d4 3.Nc3 4.f4 5.Nf3 6.Bc4 d6 7.h3 Nd7 8.Bxf7+ Kxf7 9.Ng5+ Kf6? 10.Nd5+ Kg6 11.f5+ Kh6 12.Nf7+ Kh5 13.g4+ (13.Bg5! Ngf6 14.Nf4#) Kh4 14.Kf2 e5 15.Ne3 any 16.Ng2#. Irving Chernev, The Chess-Player's Companion, Simon and Schuster, 1973, p. 215.
  42. A bizarre example of countervailing odds was ParisMarseilles, correspondence 1878. Marseilles received queen odds, in return for which it undertook to force Paris to checkmate it. (See game at the end of this article.)
  43. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Kaufman 2021, Chapter 28
  44. 1 2 Howard Staunton (1849). The Chess-Player's Companion. Henry G. Bohn. p.  440.
  45. 1 2 3 I.A. Horowitz, All About Chess, Collier Books, 1971, pp. 56–57.
  46. "2008-06-30 comment by Kaufman". Archived from the original on 2022-11-01. Retrieved 2008-07-21.
  47. Naphthalin (26 March 2024). "Leela vs GM David Navara". lczero.org. Leela Chess Zero. Retrieved 4 April 2024.
  48. Abrahams, Gerald (1948). Chess. Teach Yourself Books. English Universities Press. p. 59.
  49. Andy Soltis, Chess to Enjoy, Stein and Day, 1978, pp. 104–05. ISBN   0-8128-6059-4.
  50. 2008-07-01 comment by Kaufman
  51. Kaufman 2021, pp. 203–204
  52. Staunton discusses 2–1 money odds, for example betting two pounds on each game to the opponent's one. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, pp. 388–89.
  53. In 1963 Bobby Fischer, playing five-minute chess, gave 10–1 money odds to Stewart Reuben and 20–1 money odds to National Master Asa Hoffman. John Donaldson and Eric Tangborn, The Unknown Bobby Fischer, International Chess Enterprises, 1999, p. 71. ISBN   1-879479-85-0.
  54. Howard Staunton (1849). The Chess-Player's Companion. Henry G. Bohn. p.  384.
  55. 1 2 Irving Chernev, Wonders and Curiosities of Chess, Dover Publications, 1974, p. 31. ISBN   0-486-23007-4.
  56. 1 2 Edward Winter, Kings, Commoners and Knaves, Russell Enterprises, 1999, pp. 114–15. ISBN   1-888690-04-6.
  57. 1 2 Chess Notes No. 3502
  58. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, p. 383 (quoting Carrera).
  59. "[O]bviously, the odds-receiver can go to any limit of material sacrifice in order to get rid of that one 'fatal' piece. Conversely, this means that the odds-giver must guard that particular piece no less jealously than his King—a condition liable to cramp the style and tax the ingenuity of the best player." Assiac, The Pleasures of Chess, Dover Publications, 1960, p. 153.
  60. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, pp. 381.
  61. 1 2 Assiac, The Pleasures of Chess, Dover Publications, 1960, p. 150.
  62. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, pp. 387.
  63. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, pp. 389.
  64. 1 2 3 Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, pp. 390.
  65. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, pp. 391.
  66. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, pp. 395.
  67. Howard Staunton, The Chess-Player's Companion, 1849, pp. 395–400.
  68. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, p. 398.
  69. Staunton, The Chess Player's Companion, Henry G. Bohn, 1849, pp. 409–12.
  70. Howard Staunton, The Chess Player's Companion, Henry G. Bohn, 1849, pp. 435–40.
  71. "2008-06-02 comment on Rybka Community Forum". Archived from the original on 2023-06-28. Retrieved 2018-12-27.
  72. Larry Kaufman, The Evaluation of Material Imbalances, originally published in Chess Life , March 1999.
  73. Eckart–Tarrasch
  74. Fred Reinfeld, Tarrasch's Best Games of Chess, Dover, 1960, pp. 287–88. ISBN   0-486-20644-0.
  75. Irving Chernev and Fred Reinfeld, The Fireside Book of Chess, Simon and Schuster, 1976, p. 218. ISBN   0-671-21221-4.
  76. William Ewart Napier, Paul Morphy and the Golden Age of Chess, William Ewart Napier, David McKay, 1971, pp. 112–13.
  77. Francis J. Wellmuth, The Golden Treasury of Chess, Chess Review, 1943, p. 5.
  78. As to the spelling of Zukertort's opponent's name and the year in which the game was played, see Edward Winter, Chess Notes 5564, 5568, and 5580.
  79. Francis J. Wellmuth, The Golden Treasury of Chess, Chess Review, 1943, p. 250.
  80. Arnold Denker and Larry Parr, The Bobby Fischer I Knew and Other Stories, Hypermodern Press, 1995, pp. 10–11. ISBN   1-886040-18-4.
  81. Irving Chernev, 1000 Best Short Games of Chess, Fireside; Rei Sub edition, 1955, pp. 56–57. ISBN   978-0-671-53801-9.
  82. Macon Shibut, Paul Morphy and the Evolution of Chess Theory, Dover Publications, 2004, p. 212. ISBN   978-0-486-43574-9.
  83. Irving Chernev, 1000 Best Short Games of Chess, Fireside; Rei Sub edition, 1955, p. 433. ISBN   978-0-671-53801-9.
  84. Staunton quotes Carrera: "The player who gives the odds, loses the game if he checkmate with any other Piece than the one named." Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, p. 383.
  85. Staunton wrote in 1849 that the game was played "some years ago" and referred to his opponent as the "Hon. Mr. T." Howard Staunton, The Chess-Player's Compansion, Henry G. Bohn, 1849, p. 384. David Levy writes, "probably Taverner". D.N.L. Levy, Howard Staunton, The Chess Player, 1975, p. 137–38. ISBN   978-0-486-43574-9.
  86. Howard Staunton, The Chess-Player's Companion, Henry G. Bohn, 1849, p. 387 n. *.
  87. D.N.L. Levy, Howard Staunton, The Chess Player, 1975, pp. 137–38. ISBN   978-0-486-43574-9.
  88. Andy Soltis, Chess to Enjoy, Stein and Day, 1978, pp. 53–54. ISBN   0-8128-6059-4.
  89. Irving Chernev, The Chess Companion, Simon and Schuster, 1973, pp. 216–17.

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References