John Nunn | |
---|---|
Full name | John Denis Martin Nunn |
Country | England |
Born | London, England | 25 April 1955
Title | Grandmaster (1978) International Solving Grandmaster (2004) |
World Champion | WC Problem Solving 2004, 2007, 2010 WC (Seniors over-65) 2022, 2023 |
FIDE rating | 2546 (November 2024) |
Peak rating | 2630 (January 1995) |
Peak ranking | No. 9 (January 1985) |
Scientific career | |
Thesis | Some problems in algebraic topology (1978) |
Doctoral advisor | John Hubbuck |
John Denis Martin Nunn (born 25 April 1955) is an English chess grandmaster, a three-time world champion in chess problem solving, a chess writer and publisher, and a mathematician. He is one of England's strongest chess players and was formerly in the world's top ten. [1] [2]
Nunn was born in London. As a junior, he showed a prodigious talent for chess and in 1967, at 12 years of age, he won the British under-14 Championship. At 14, he was London Under-18 Champion for the 1969–70 season [3] and less than a year later, at just 15 years of age, he proceeded to Oriel College, Oxford, to read Mathematics. At the time, Nunn was Oxford's youngest undergraduate since Cardinal Wolsey in 1520. [4] Graduating in 1973, he went on to gain a Doctor of Philosophy degree in 1978 with a thesis on finite H-spaces, supervised by John Hubbuck. [5] In 1978, Nunn spent a year teaching Mathematics at Maidstone Grammar School, before returning to Oxford as a mathematics lecturer until 1981, when he became a professional chess player.
In 1975, he became the European Junior Chess Champion. He gained the Grandmaster title in 1978 and was British champion in 1980. Nunn has twice won individual gold medals at Chess Olympiads. In 1989, he finished sixth in the inaugural 'World Cup', a series of tournaments in which the top 25 players in the world competed. His best performance in the World Chess Championship cycle came in 1987, when he lost a playoff match against Lajos Portisch for a place in the Candidates Tournament. At the prestigious Hoogovens tournament (held annually in Wijk aan Zee) he was a winner in 1982, 1990 and 1991.
Nunn achieved his highest Elo rating of 2630 in January 1995. Six years earlier, in January 1989, his then rating of 2620 was high enough to elevate him into the world's top ten, where he shared ninth place. This was close to the peak of the English chess boom, and there were two English players above him on the list: Nigel Short (world number three, 2650) and Jonathan Speelman (world number five, 2640). Nunn has now retired from serious tournament play and, until he resurfaced as a player in two Veterans events in 2014 and 2015, had not played a FIDE-rated game since August 2006; [6] however, he has been active in the ECF rapid play. [7]
As well as being a strong player, Nunn is regarded as one of the best contemporary authors of chess books. He has penned many books, including Secrets of Grandmaster Chess, which won the British Chess Federation Book of the Year award in 1988, and John Nunn's Best Games, which took the award in 1995. He is the director of chess publishers Gambit Publications. Chess historian Edward Winter has written of him: [8] [9]
A polymath, Nunn has written authoritative monographs on openings, endings and compositions, as well as annotated games collections and autobiographical volumes. As an annotator he is equally at home presenting lucid prose descriptions for the relative novice and analysis of extreme depth for the expert.
In a 2010 interview, Magnus Carlsen said he thought extreme intelligence could be a hindrance to one's chess career. [10] As an example of this, he cited Nunn:
I am convinced that the reason the Englishman John Nunn never became world champion is that he is too clever for that. ... He has so incredibly much in his head. Simply too much. His enormous powers of understanding and his constant thirst for knowledge distracted him from chess.
Nunn is also involved with chess problems, composing several examples and solving as part of the British team on several occasions. On this subject he wrote Solving in Style (1985). He won the World Chess Solving Championship in Halkidiki, Greece, in September 2004 and also made his final GM norm in problem solving. There were further wins of the World Solving Championship in 2007 [11] and in 2010. [12] He is the third person ever to gain both over-the-board and solving GM titles (the others being Jonathan Mestel and Ram Soffer; Bojan Vučković has been the fourth since 2008).
Nunn has long been interested in computer chess. In 1984, he began annotating games between computers for Personal Computer World magazine, and joined the editorial board of Frederic Friedel's Computerschach & Spiele magazine. In 1987, he was announced as the first editor of the newly created Chessbase magazine. [13] The 1992 release of his first book making use of chess endgame tablebases, Secrets Of Rook Endings, was later followed by Secrets of Minor-Piece Endings, and Secrets Of Pawnless Endings. These books include human-usable endgame strategies found by Nunn (and others) by extensive experimentation with tablebases, and new editions have come out and are due as more tablebases are created and tablebases are more deeply data-mined. Nunn is thus (as of 2004) the foremost data miner of chess endgame tablebases.
Nunn finished third in the World Senior Chess Championship (over-50 section) of 2014 in Katerini, Greece, [14] second in the European Senior Chess Championship (over-50) of 2015 in Eretria, Greece, [15] and first in the World Senior Chess Championship (over-65 section) in Assisi, Italy in 2022. [16] He was the winner again in 2023, at Terrasini.
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Nunn is married to Petra Fink-Nunn, a German chess player with the title Woman FIDE Master. They have a son, Michael.
Coincident with a reduction in his over-the-board chess, Nunn has developed a passion for astronomy, a hobby he shares with ex-world chess champion Viswanathan Anand. Nunn has various articles and lectures published in Chessbase News. [18] [19] [20] [21]
The endgame is the final stage of a chess game which occurs after the middlegame. It begins when few pieces are left on the board.
Zugzwang is a situation found in chess and other turn-based games wherein one player is put at a disadvantage because of their obligation to make a move; a player is said to be "in zugzwang" when any legal move will worsen their position.
The fifty-move rule in chess states that a player can claim a draw if no capture has been made and no pawn has been moved in the last fifty moves. The purpose of this rule is to prevent a player with no chance of winning from obstinately continuing to play indefinitely or seeking to win by tiring the opponent.
Joseph Gerald Gallagher is a British-born Swiss chess player and writer. He was awarded the title of Grandmaster by FIDE in 1990 and has been the national champion of both Britain and Switzerland.
The two knights endgame is a chess endgame with a king and two knights versus a king. In contrast to a king and two bishops, or a bishop and a knight, a king and two knights cannot force checkmate against a lone king. Although there are checkmate positions, a king and two knights cannot force them against proper, relatively easy defense.
The Philidor position is a chess endgame involving a drawing technique for the defending side in the rook and pawn versus rook endgame. This technique is known as the third-rank defense due to the positioning of the defending rook. It was analyzed by François-André Danican Philidor in 1777. Many rook and pawn versus rook endgames reach either the drawn Philidor position or the winning Lucena position. The defending side should try to reach the Philidor position; the attacking side should try to reach the Lucena position. Said grandmaster Jesús de la Villa, "[The Lucena and Philidor positions] are the most important positions in this type of endgame [...] and in endgame theory."
The Tarrasch rule is a general principle that applies in the majority of chess middlegames and endgames. Siegbert Tarrasch (1862–1934) stated the "rule" that rooks should be placed behind passed pawns – either the player's or the opponent's. The idea behind the guideline is that (1) if a player's rook is behind their own passed pawn, the rook protects it as it advances, and (2) if it is behind an opponent's passed pawn, the pawn cannot advance unless it is protected along its way.
John Michael Emms is an English chess Grandmaster and chess author. He tied for first in the 1997 British Championship. He was the 2002 captain of the English Olympiad team. In October 2004, he also coached a woman's team in the 36th Chess Olympiad in Calvià, Majorca.
In chess, the endgame tablebase, or simply tablebase, is a computerised database containing precalculated evaluations of endgame positions. Tablebases are used to analyse finished games, as well as by chess engines to evaluate positions during play. Tablebases are typically exhaustive, covering every legal arrangement of a specific selection of pieces on the board, with both White and Black to move. For each position, the tablebase records the ultimate result of the game and the number of moves required to achieve that result, both assuming perfect play. Because every legal move in a covered position results in another covered position, the tablebase acts as an oracle that always provides the optimal move.
In chess, the exchange is the material difference of a rook for a minor piece. Having a rook for a minor piece is generally advantageous, since the rook is usually more valuable. A player who has a rook for a minor piece is said to be up the exchange, and the other player is down the exchange. A player who wins a rook for a minor piece is said to have won the exchange, while the other player has lost the exchange. The opposing captures often happen on consecutive moves, but this is not strictly necessary. Although it is generally detrimental to lose the exchange, one may occasionally find reason to purposely do so; the result is an exchange sacrifice.
In chess, a fortress is an endgame drawing technique in which the side behind in material sets up a zone of protection that the opponent cannot penetrate. This might involve keeping the enemy king out of one's position, or a safe zone the enemy cannot force one out of. An elementary fortress is a theoretically drawn position with reduced material in which a passive defense will maintain the draw.
A pawnless chess endgame is a chess endgame in which only a few pieces remain, and no pawns. The basic checkmates are types of pawnless endgames. Endgames without pawns do not occur very often in practice except for the basic checkmates of king and queen versus king, king and rook versus king, and queen versus rook. Other cases that occur occasionally are (1) a rook and minor piece versus a rook and (2) a rook versus a minor piece, especially if the minor piece is a bishop.
Much literature about chess endgames has been produced in the form of books and magazines. A bibliography of endgame books is below.
The rook and bishop versus rook endgame is a chess endgame where one player has just a king, a rook, and a bishop, and the other player has just a king and a rook. This combination of material is one of the most common pawnless chess endgames. It is generally a theoretical draw, but the rook and bishop have good winning chances in practice because the defense is difficult. Ulf Andersson won the position twice within a year, once against a grandmaster and once against a candidate master; and grandmaster Keith Arkell has won it 27 times out of 27. In positions that have a forced win, up to 59 moves are required. Tony Kosten has seen the endgame many times in master games, with the stronger side almost always winning. Pal Benko called this the "headache ending." David Howell observed, "Especially below elite grandmaster level, this is one of the hardest endgames to draw."
The game of chess is commonly divided into three phases: the opening, middlegame, and endgame. There is a large body of theory regarding how the game should be played in each of these phases, especially the opening and endgame. Those who write about chess theory, who are often also eminent players, are referred to as "chess theorists" or "chess theoreticians".
The queen and pawn versus queen endgame is a chess endgame in which both sides have a queen and one side has a pawn, which one tries to promote. It is very complicated and difficult to play. Cross-checks are often used as a device to win the game by forcing the exchange of queens. It is almost always a draw if the defending king is in front of the pawn.