Computer shogi

Computer shogi is a field of artificial intelligence concerned with the creation of computer programs which can play shogi. The research and development of shogi software has been carried out mainly by freelance programmers, university research groups and private companies. By 2017, the strongest programs were outperforming the strongest human players.

Game complexity

Shogi has the distinctive feature of reusing captured pieces. Therefore, shogi has a higher branching factor than other chess variants. The computer has more positions to examine because each piece in hand can be dropped on many squares. This gives shogi the highest number of legal positions and the highest number of possible games of all the popular chess variants. The higher numbers for shogi mean it is harder to reach the highest levels of play. The number of legal positions and the number of possible games are two measures of shogi's game complexity.

The complexity of Go can be found at Go and mathematics. More information on the complexity of Chess can be found at Shannon number.

Game	Board Size	Number of Pieces	Number of Different Pieces Per Side	Legal Positions	Possible Games	Average Game Length
Chess	64	32	6	1047	10123	70
Xiangqi	90	32	7	1040	10150	95
Janggi	90	32	7	1044	10160	100
Shogi	81	40	8	1071	10226	115 [1]
Go / Baduk / Weiqi	361	Up to 361	1	10170	10360 [2]	150

Components

The primary components of a computer shogi program are the opening book, the search algorithm and the endgame. The "opening book" helps put the program in a good position and saves time. Shogi professionals, however, do not always follow an opening sequence as in chess, but make different moves to create good formation of pieces. The "search algorithm" looks ahead more deeply in a sequence of moves and allows the program to better evaluate a move. The search is harder in shogi than in chess because of the larger number of possible moves. A program will stop searching when it reaches a stable position. The problem is many positions are unstable because of the drop move. Finally, the "endgame" starts when the king is attacked and ends when the game is won. In chess, there are fewer pieces which leads to perfect play by endgame databases; However, pieces can be dropped in shogi so there are no endgame databases. A tsumeshogi solver is used to quickly find mating moves.

Computers versus humans

In the 1980s, due to the immaturity of the technology in such fields as programming, CPUs and memory, computer shogi programs took a long time to think, and often made moves for which there was no apparent justification. These programs had the level of an amateur of kyu rank.

In the first decade of the 21st century, computer shogi has taken large steps forward in software and hardware technology. In 2007, top shogi player Yoshiharu Habu estimated the strength of the 2006 world computer shogi champion Bonanza. He contributed to the newspaper Nihon Keizai Shimbun evening edition on 26 March 2007 about the match between Bonanza and then Ryūō Champion Akira Watanabe. Habu rated Bonanza's game at the level of 2 dan shogi apprentice (shōreikai).^{[ citation needed ]}

In particular, computers are most suited to brute-force calculation, and far outperform humans at the task of finding ways of checkmating from a given position, which involves many fewer possibilities. In games with time limits of 10 seconds from the first move, computers are becoming a tough challenge for even professional shogi players.^{[ citation needed ]} The past steady progress of computer shogi is a guide for the future. In 1996 Habu predicted a computer would beat him in 2015. ^[3] Akira Watanabe gave an interview to the newspaper Asahi Shimbun in 2012. He estimated the computer played at the 4 dan professional level. Watanabe also said the computer sometimes found moves for him. ^[4]

On 23 October 2005, at the 3rd International Shogi Forum, the Japan Shogi Association permitted Toshiyuki Moriuchi, 2005 Meijin, to play computer shogi program YSS. Toshiyuki Moriuchi won the game playing 30 seconds per move with a Bishop handicap. ^[5] In 2012, a retired professional lost a match with computer publicly first, ^[6] and in 2013, active shogi professionals too.

Bonanza versus Watanabe (2007)

The Japan Shogi Association (JSA) gave reigning Ryuo Champion Watanabe permission to compete against the reigning World Computer Shogi Champion Bonanza on 21 March 2007. Daiwa Securities sponsored the match. Hoki Kunihito wrote Bonanza. The computer was an Intel Xeon 2.66 GHz 8 core with 8 gigabytes of memory and 160-gigabyte hard drive. The game was played with 2 hours each and 1 minute byo-yomi per move after that. Those conditions favor Watanabe because longer time limits mean there are fewer mistakes from time pressure. Longer playing time also means human players can make long-term plans beyond the computer's calculating horizon. The 2 players were not at the same playing level. Watanabe was the 2006 Ryuo Champion and he gave Bonanza a rating equivalent to first or third dan. ^[7] Bonanza was a little stronger than before due to program improvements and a faster computer. Watanabe prepared for a weaker Bonanza as Watanabe studied old Bonanza game records.

Bonanza moved first and played Fourth File Rook Bear-in-the-hole as Watanabe expected. Watanabe thought some of Bonanza's moves were inferior. However, Watanabe deeply analyzed these moves thinking that maybe the computer saw something that Watanabe did not see. Watanabe commented after the game that he could have lost if Bonanza had played defensive moves before entering the endgame. But the computer choose to attack immediately instead of taking its time (and using its impressive endgame strategies) which cost it the match. Bonanza resigned after move 112. ^[8]

After Bonanza's loss Watanabe commented on computers in his blog, "I thought they still had quite a way to go, but now we have to recognize that they've reached the point where they are getting to be a match for professionals."^{[ citation needed ]} Watanabe further clarified his position on computers playing shogi in the Yomiuri Shimbun on 27 June 2008 when he said "I think I'll be able to defeat shogi software for the next 10 years".^{[ citation needed ]} Another indication Bonanza was far below the level of professional Watanabe came 2 months after the match at the May 2007 World Computer Shogi Championship. Bonanza lost to the 2007 World Computer Shogi Champion YSS. Then YSS lost to amateur Yukio Kato in a 15-minute game.

Annual CSA tournament exhibition games (2003–2009)

The winners of CSA tournaments played exhibition games with strong players. These exhibition games started in 2003. ^[9]

Year	Program	Human	Handicap	Time	Byoyomi	Winner
2003	IS Shogi	Pro 5 Dan Katsumata	2 Piece Handicap	25 Min	None	Computer
2004	YSS	Pro 5 Dan Katsumata	Rook	25 Min	None	Computer
2005	Gekisashi	Pro 5 Dan Katsumata	Bishop	25 Min	None	Computer
2006	Bonanza	Yukio Kato	None	15 Min	30 Sec	Human
2007	YSS	Yukio Kato	None	15 Min	30 Sec	Human
2008	Tanase Shogi	Yukio Kato	None	15 Min	30 Sec	Computer
2008	Gekisashi	Toru Shimizugami	None	15 Min	30 Sec	Computer
2009	GPS Shogi	Amateur champion	None	1 hour	1 min	Canceled

In each succeeding year, the human competition was stronger to match the stronger programs. Yukio Kato was the Asahi Amateur Meijin champion. Toru Shimizugami was the Amateur Meijin champion. Eiki Ito, the creator of Bonkras, said in 2011, at present, top Shogi programs like Bonkras are currently at a level of lower- to middle-class professional players. ^[10]

Akara versus Shimizu (2010)

The computer program Akara defeated the women's Osho champion Ichiyo Shimizu. Akara contained 4 computer engines: Gekisashi, GPS Shogi, Bonanza, and YSS. Akara ran on a network of 169 computers. The 4 engines voted on the best moves. Akara selects the move with the most votes. If there is a tie vote then Akara selects Gekisashi's move. Researchers at the University of Tokyo and the University of Electro-Communications developed Akara.

Shimizu moved first and resigned in 86 moves after 6 hours and 3 minutes. Shimizu said she was trying to play her best as if she was facing a human player. She played at the University of Tokyo on 11 October 2010. The allotted thinking time per player is 3 hours and 60 seconds byoyomi. 750 fans attended the event. This is the third time since 2005 that the Japan Shogi Association granted permission to a professional to play a computer, and the first victory against a female professional.

Akara aggressively pursued Shimizu from the start of the game. Akara played with a ranging rook strategy and offered an exchange of bishops. Shimizu made a questionable move partway though the game, and Akara went on to win. ^[11] Ryuo champion, Akira Watanabe, criticized Shimizu's game. On 19 November 2010, the Daily Yomiuri quoted Watanabe. Watanabe said, "Ms. Shimizu had plenty of chances to win". ^[12]

Computers Bonanza and Akara beat amateurs Kosaku and Shinoda (2011)

On 24 July 2011, there was a two-game amateur versus computer match. Two computer shogi programs beat a team of two amateurs. One amateur, Mr. Kosaku, was a Shoreikai three Dan player. The other amateur, Mr. Shinoda, was the 1999 Amateur Ryuo. The allotted time for the amateurs was main time 1 hour and then 3 minutes per move. The allotted time for the computer was main time 25 minutes and then 10 seconds per move. ^{[13] [14] [15]}

Game	Computer	Sente (first)	Gote (second)	Moves	Computer Time	Amateur Time	Hardware	Winner
1	Bonanza	Kosaku & Shinoda	Bonanza	93	24 min 41 sec	2 hours 2 min	17 processors, 132 cores, 300 GB	Bonanza
2	Akara	Akara	Kosaku & Shinoda	150	25 min 54 sec	1 hour 42 min	Intel Xeon W3680 with 6 cores	Akara

Bonkras versus Yonenaga (2011–2012)

On 21 December 2011, computer program Bonkras crushed retired 68-year-old Kunio Yonenaga, the 1993 Meijin. They played 85 moves in 1 hour, 3 minutes 39 seconds on Shogi Club 24. Each player started with 15 minute time limit and an additional 60 seconds are added to each player's time limit per move. Yonenaga was gote (white) and played 2. K-62. This move was to confuse the computer by playing a move not in Bonkras's joseki (opening book).^{[ citation needed ]} On 14 January 2012, Bonkras again defeated Yonenaga. This match is the first Denou-sen match. The game had 113 moves. Time allowed was 3 hours and then 1 minute per move. Bonkras moved first and used a ranging rook opening. Yonenaga made the same second move, K-6b, as in the previous game he lost. Bonkras ran on a Fujitsu Primergy BX400 with 6 blade servers to search 18,000,000 moves per second. Yonenaga used 2 hours 33 minutes. Bonkras used 1 hour 55 minutes. ^[6] Bonkras evaluated its game with Yonenaga in January 2012. ^[16]

Denou-sen (2013)

Denou-sen was a shogi competition where humans faced off against machines. The second Denou-sen match was a five-game match sponsored by Niconico in which five professional shogi players played against five computers. The winners of the previous World Computer Shogi Championship played against professional shogi players. The primary time control was of 4 hours, and the secondary time control was 1 move in 60 seconds. Niconico broadcast the games live with commentary. ^{[17] [ failed verification – see discussion ]}

Shogi professionals

Name	Dan	Jun'isen class	Age	JSA number
Kōru Abe	4	C2	18	283
Shin'ichi Satō	4	C2	31	271
Kōhei Funae	5	C1	26	281
Yasuaki Tsukada	9	C1	48	148
Hiroyuki Miura	8	A	39	204

Programs

Program	Programmers	Hardware	Positions/second	Moves deep	Programmer's First Tournament
Shueso	Akira Takeuchi	2 CPUs/8 cores	10,000,000	18~	2008
Ponanza	Issei Yamamoto	10 CPUs	30,000,000	30~	2009
Tsutsukana	Takanori Ichimaru	1 CPU			2010
Puella alpha	Eikyu Ito	3 CPUs/16 cores	4,000,000	20~	1999
GPS Shogi	Tanaka Tetsuro, GPS team	667 CPUs	280,000,000	22	2001

Games

Date	Black	White	Moves	Professional time	Computer time	Winner
23 March	Kōru Abe	Shueso	113	3 hours, 1 minute	3 hours, 15 minutes	Human
30 March	Ponanza	Shin'ichi Satō	141	3 hours, 59 minutes	3 hours, 31 minutes	Computer
6 April	Kōhei Funae	Tsutsukana	184	3 hours, 59 minutes	3 hours, 27 minutes	Computer
13 April	Puella Alpha	Yasuaki Tsukada	230	3 hours, 29 minutes	2 hours, 19 minutes	Draw
20 April	Hiroyuki Miura	GPS Shogi [18]	102	3 hours, 59 minutes	2 hours, 7 minutes	Computer

Miura versus GPS Shogi

Miura vs gps将棋 (2013)

☖ pieces in hand: –

9	8	7	6	5	4	3	2	1
香	桂						桂	香	1
	飛					金	王		2
		銀	歩		金	銀	歩		3
歩			角	歩	歩	歩		歩	4
	歩	歩					歩		5
歩		歩	歩	歩		歩		歩	6
	歩	銀	金		歩	銀			7
	玉	金	角				飛		8
香	桂						桂	香	9

☗ pieces in hand: –

The game was a Double Yagura opening with both kings fully castled. ^[19] The engine gps将棋 (playing as White) started the attack on the seventh file with 20...P-75.

Hiroyuki Miura said before his game he would play with "all his heart and soul". Miura decided to use trusted opening theory instead of an anti-computer strategy. The computer played book moves and they castled symmetrically to defend their kings. The computer attacked quickly and Miura counterattacked with a drop move. More than 8 hours later Miura resigned. After the game, Miura said that "he should not have prepared for the game the way he did. He should have prepared for the game with a genuine sense of urgency, if only he knew, the computer was so strong." ^[20] Miura expressed disappointment and said he had yet to figure out where he went wrong. ^[21] The evaluation of the game by GPS is on the GPS Shogi web site. ^[22]

Funae versus Tsutsukana (revenge match)

On 31 December 2013, Funae and Tsutsukana played a second game. Tsutsukana was the same version that beat Funae on 6 April 2013. The computer was one Intel processor with 6 cores. Funae won. ^[23]

Denou-sen 3 (2014)

In 2013, the Japan Shogi Association announced that five professional shogi players would play five computers from 15 March to 12 April 2014. ^[24] On 7 October 2013, the Japan Shogi Association picked the five players. ^[25]

Professional Shogi Players

Name	Dan	Jun'isen	JSA number	Age
Tatsuya Sugai	5	C1	278	22
Shinya Satō	6	C1	224	36
Masayuki Toyoshima	7	B1	264	24
Taku Morishita	9	B2	161	47
Nobuyuki Yashiki	9	A	189	42

The professional shogi players played the winners of a preliminary computer tournament. The preliminary computer tournament was held 2–4 November 2013. ^[26]

Winners of the Preliminary Computer Tournament

Programmers	Program	Rank	Positions/second
Akira Takeuchi	Shueso	5
Motohiro Isozaki	Yaneuraou	4	4,000,000
Hiroshi Yamashita	YSS	3	4,000,000
Takanori Ichimaru	Tsutsukana	2
Issei Yamamoto	Ponanza	1	3,000,000

Computer restrictions

• Each shogi program ran on a single Intel processor with 6 cores. No multiple processor systems were allowed. ^[27]
• No changes were allowed to the shogi programs after the preliminary computer tournament.
• Professional shogi players trained with the shogi programs after the preliminary computer tournament.

Tournament ^[28]

Date	Black	White	Moves	Professional time	Computer time	Winner
15 March	Tatsuya Sugai	Shueso	98 [29]	4 hours, 39 minute	4 hours, 1 minutes	Computer
22 March	Yaneuraou	Shinya Satō	95 [30]	5 hours, 0 minutes	3 hours, 27 minutes	Computer
29 March	Masayuki Toyoshima	YSS	83 [31]	2 hours, 8 minutes	3 hours, 15 minutes	Professional
5 April	Tsutsukana	Taku Morishita	135 [32]	4 hours, 48 minutes	3 hours, 56 minutes	Computer
12 April	Nobuyuki Yashiki	Ponanza	130 [33]	5 hours, 0 minutes	4 hours, 51 minutes	Computer

Each player started with 5 hours at 10 am. After the 5 hours, the player must complete each move in 1 minute. There was a 1 hour lunch break at 12:00 and a half hour dinner break at 5 pm. ^[34] Niconico is broadcasting the games live with commentary. ^[35] Japanese auto parts maker Denso developed a robotic arm to move the pieces for the computer. ^[36]

Yashiki versus Ponanza

Ōshō and Kiō champion Akira Watanabe wrote in his blog that "a human cannot think of some of Ponanza's moves such as 60.L*16 and 88.S*79. I am not sure they were the best moves or not right now, but I feel like I'm watching something incredible." ^[37] Kisei, Ōi and Ōza champion Yoshiharu Habu told The Asahi Shimbun , "I felt the machines were extraordinarily strong when I saw their games this time." ^[38]

Denou-sen 3.1: Sugai versus Shueso (revenge match)

On Saturday 19 July 2014, Tatsuya Sugai once again got the chance to play against Shueso in what was billed as the "Shogi Denou-sen Revenge Match". Sugai had already been beaten by Shueso four months earlier in game one of Denou-sen 3, so this was seen as his chance to gain revenge for that loss. The game was sponsored by both the Japan Shogi Association and the telecommunications and media company Dwango and was held at the Tokyo Shogi Kaikan (the Japan Shogi Association's head office). Although the playing site was closed to the public, the game was streamed live via Niconico Live with commentary being provided by various shogi professionals and women's professionals. Shuesho's moves were made by Denso's robotic arm. The initial time control for each player was eight hours which was then followed by a 1-minute byoyomi. In addition, four 1-hour breaks were scheduled throughout the playing session to allow both sides time to eat and rest. The game lasted through the night and into the next day and finally finished almost 20 hours after it started when Sugai resigned after Shueso's 144 move. ^{[39] [40]}

Programmer tools

Shogidokoro

Screenshot of 将棋所 in English with analysis window as run on a Mac

Shogidokoro (将棋所) is a Windows graphical user interface (GUI) that calls a program to play shogi and displays the moves on a board. ^[41] Shogidokoro was created in 2007. Shogidokoro uses the Universal Shogi Interface (USI). The USI is an open communication protocol that shogi programs use to communicate with a user interface. USI was designed by Norwegian computer chess programmer Tord Romstad in 2007. Tord Romstad based USI on Universal Chess Interface (UCI). UCI was designed by computer chess programmer Stefan Meyer-Kahlen in 2000. Shogidokoro can automatically run a tournament between two programs. This helps programmers to write shogi programs faster because they can skip writing the user interface part. It is also useful for testing changes to a program. Shogidokoro can be used to play shogi by adding a shogi engine to Shogidokoro. Some engines that will run under Shogidokoro are the following:

• Apery ^[42]
• aperypaq (Apery SDT5 + Qhapaq SDT5) ^{[43] [44]}
• BlunderXX ^[45]
• Bonanza ^[46]
• elmo ^[47]
• eloqhappa (elmo WCSC27 + Qhapaq WCSC27) ^[44]
• Gikou (技巧) ^[48]
• GPS Shogi ^[49]
• Laramie
• Lesserkai ^[50]
• Lightning
• Ponanza Quartet
• Qhapaq ^[51]
• relmo (elmo WCSC27 + rezero8), ^[52]
• rezero ^{[53] [54]}
• Silent Majority ^[55]
• Spear
• SSP
• Tanuki (ナイツ・オブ・タヌキ WCSC27, 平成将棋合戦ぽんぽこ SDT5) ^[56]
• TJshogi
• Ukamuse (浮かむ瀬 – the 2016 release of Apery) ^[57]
• YaneuraOu (やねうら王) ^[54]
• Yomita (読み太) ^[58]

The interface can also use tsumeshogi solver-only engines like SeoTsume (脊尾詰). ^[59] The software's menus have both Japanese and English language options available.

XBoard/WinBoard

screenshot of XBoard (shogi version)

XBoard/WinBoard is another GUI that supports shogi and other chess variants including western chess and xiangqi. Shogi support was added to WinBoard in 2007 by H.G. Muller. WinBoard uses its own protocol (Chess Engine Communication Protocol) to communicate with engines, but can connect to USI engines through the UCI2WB adapter. Engines that can natively support WinBoard protocol are Shokidoki, TJshogi, GNU Shogi and Bonanza. ^[60] Unlike Shogidokoro, WinBoard is free/libre and open source, and also available for the X Window System as XBoard (for Linux and Mac systems).

A number of Shogi variants, such as Chu Shogi and Dai Shogi, are playable against AI using a forked version of Winboard. Included engines are: Shokidoki, which can play the smaller variants with drops (i.e. Minishogi); and HaChu, a large Shogi variant engine designed for playing Chu Shogi and has improved in strength over time. ^[61]

Shogi Browser Q

screenshot of 将棋ぶらうざQ

将棋ぶらうざQ (Shogi Browser Q) is a free cross-platform (Java) GUI, that can run USI engines and compete on Floodgate. ^[62] Since v3.7 both Japanese and English languages are available.

BCMShogi

BCMShogi ^[63] is an English language graphical user interface for the USI protocol and the WinBoard shogi protocol. It is no longer developed and currently is unavailable from the author's website.

Floodgate

Floodgate is a computer shogi server for computers to compete and receive ratings. ^[64] Programs running under Shogidokoro can connect to Floodgate. The GPS team created Floodgate. Floodgate started operating continuously in 2008. The most active players have played 4,000 games. From 2008 to 2010, 167 players played 28,000 games on Floodgate. Humans are welcome to play on Floodgate. The time limit is 15 minutes per player, sudden death. From 2011 to 2018, the Floodgate's number one program increased by 1184 points, an average of 169 points per year.

Floodgate Annual Highest Rating

Date	Program	Rating
23 May 2011	Bonanza_expt	3054
23 May 2012	PonanzaCluster	3080
23 May 2013	Ponanza_expt	3113
23 May 2014	NineDayFever_XeonE5-2690_16c	3252
18 May 2015	Ponanza_expt	3626
23 May 2016	Ponanza-990XEE	3715
23 May 2017	monkeymagic	3998
23 May 2018	Pulsation	4238

World Computer Shogi Championship

The annual computer vs computer world shogi championship is organized by the Computer Shogi Association (CSA) of Japan. ^[65] The computers play automated games through a server. Each program has 25 minutes to complete a game. The first championship was in 1990 with six programs. In 2001, it grew to 55 programs. The championship is broadcast on the Internet. At the 19th annual CSA tournament, four programs (GPS Shogi, Otsuki Shogi, Monju and KCC Shogi) that had never won a CSA tournament defeated three of the previous year's strongest programs (Bonanza, Gekisashi and YSS). ^[66] The top three winners of the 2010 CSA tournament are Gekisashi, Shueso and GPS Shogi. ^[67]

In 2011, Bonkras won the CSA tournament with five wins out of seven games. Bonkras ran on a computer with three processors containing 16 cores and six gigabytes of memory. Bonanza won second place on a computer with 17 processors containing 132 cores and 300 gigabytes of memory. Shueso won third place. The 2010 CSA winner, Gekisashi, won fourth place. Ponanza won fifth place. GPS Shogi won sixth place on a computer with 263 processors containing 832 cores and 1486 gigabytes of memory. ^{[68] [69]} In 2012, GPS Shogi searched 280,000,000 moves per second and the average search depth was 22.2 moves ahead. Hiroshi Yamashita, the author of YSS, maintains a list of all shogi programs that played in World Computer Shogi Championship by year and winning rank. ^[70]

CSA World Computer Shogi Championship Winners

	Year	Developer	Program	Score wins/total	Computer	Clock	Processors	Cores	Memory	Language
1	1990	Nobuhiro Yoshimura	Eisei Meijin	5/5	NEC PC-9801RA21
2	1991	Kazurou Morita	Morita Shogi 3	7/8	NEC PC-H98S					ASM
3	1992	Log corp.	Kiwame	5/7	486DX2	66 MHz				C
4	1993	Log corp.	Kiwame II	7/7	Pentium	60 MHz				C
5	1994	Shinichirou Kanazawa	Kiwame 2.1	6/7	Pentium	90 MHz				C
6	1996	Shinichirou Kanazawa	Kanazawa Shogi	7/7	Alpha AXP	300 MHz				C
7	1997	Hiroshi Yamashita	YSS 7.0	7/7	Alpha	500 MHz				C
8	1998	Yasushi Tanase	IS Shogi	6/7	Pentium II	300 MHz				C
9	1999	Shinichirou Kanazawa	Kanazawa Shogi	6/7	Pentium III	500 MHz				C
10	2000	Yasushi Tanase	IS Shogi	5/7	Athlon	800 MHz				C
11	2001	Yasushi Tanase	IS Shogi	9/9	Athlon	1.2 GHz				C
12	2002	University of Tokyo	Gekisashi	6/7	Athlon MP *2	2000+				C++
13	2003	Yasushi Tanase	IS Shogi	6/7	Pentium 4	3.00 GHz				C++
14	2004	Hiroshi Yamashita	YSS 7.0	6/7	Opteron 248 *2	2.2 GHz				C++
15	2005	Gekisashi Team	Gekisashi	7/7	Opteron *2	2.6 GHz				C++
16	2006	Kunihito Hoki	Bonanza	6/7	CoreDuo T2600	2.16 GHz				C
17	2007	Hiroshi Yamashita	YSS 7.0	6/7	Xeon X5355	2.66 GHz	2	8		C++
18	2008	Gekisashi Team	Gekisashi	6/7	Xeon X5482	3.2 GHz	2	8		C++
19	2009	GPS Team	GPS Shogi	6/7	Xeon X5570	2.93 GHz	2	8		C++
20	2010	Gekisashi Team	Gekisashi	6/7	Xeon W5590	3.33 GHz	2	8		C++
21	2011	Eikyu Ito	Bonkras	5/7	Core i7-980, Core i7-2600K, PhenomIIX6 1100T	3.4 GHz 3.4 GHz 3.33 GHz	3	16	6 GB	C, C++
22	2012	GPS Team	GPS Shogi	6/7	Cluster 797 computers		804	3224	3272 GB	C++
23	2013	Kunihito Hoki	Bonanza	5/7	Xeon (Multi)		31	388		C, Perl
24	2014	Osaka City University Mathematical Engineering Laboratory	Apery	5/7	Core i7 3930K	OC 4.3 GHz	1	6	32GB	C++
25	2015	Issei Yamamoto	Ponanza	7/7	Xeon E5-2666 v3	2.90 GHz	4	64	240GB	C++
26	2016	Issei Yamamoto	Ponanza	7/7	Xeon E5-2650 v3 x 4		4	20 x 4	16GB×4 8GB×2	C++ C#
27	2017	Makoto Takizawa	elmo	7/7	Xeon E 5-2686 v 4 (AWS EC 2 m 4.16 xlarge)	2.7 GHz (Full Core Turbo Boost)	2	32	256GB	C++
28	2018	Barrel house	Hefeweizen	6/7	Amazon EC2 m5.24xlarge x 5 + laptop				386GB×5 + laptop	C++, main is Python

Video game systems

Main article: List of shogi video games

Some commercial game software which play shogi are Habu Meijin no Omoshiro Shōgi for Super Famicom, Clubhouse Games for Nintendo DS and Shotest Shogi for Xbox.

Restrictions

On 18 September 2005 a Japan Shogi Association professional 5 dan played shogi against a computer. The game was played at the 29th Hokkoku Osho-Cup Shogi Tournament in Komatsu, Japan. The Matsue National College of Technology developed the computer program Tacos. Tacos played first and chose the static rook line in the opening. Professional Hashimoto followed the opening line while changing his bishop with the bishop of Tacos. Tacos had a good development with some advantages in the opening and middle game even until move 80. Many amateur players expected Tacos to win. However, professional Hashimoto defended and Tacos played strange moves. Tacos lost. ^[71]

On 14 October 2005, the Japan Shogi Association banned professional shogi players from competing against a computer. ^[72] The Japan Shogi Association said the rule is to preserve the dignity of its professionals, and to make the most of computer shogi as a potential business opportunity. The ban prevents the rating of computers relative to professional players.

From 2008 to 2012, the Japan Shogi Association (with Kunio Yonenaga as president) did not permit any games between a professional and a computer.

Milestones

• 2005: at the Amateur Ryuo tournament, program Gekisashi defeated Eiji Ogawa in a 40-minute game of the first knockout round.
• 2005: Program Gekisashi defeated amateur 6-dan Masato Shinoda in a 40-minute exhibition game.
• 2007: highest rating for a computer on Shogi Club 24 is 2744 for YSS. ^[73]
• 2008: May, computer program Tanase Shogi beat Asahi Amateur Meijin title holder Yukio Kato. 75 moves played in a 15-minute exhibition game.
• 2008: May, computer program Gekisashi beat Amateur Meijin Toru Shimizugami. 100 moves played in a 15-minute exhibition game. ^[74]
• 2008: November, Gekisashi beat Amateur Meijin Shimizugami in a 1-hour game with 1-minute byoyomi. ^[75]
• 2010: October, first time a computer beat a shogi champion. Akara beat the women's Osho champion Shimizu in 6 hours and 3 minutes.
• 2011: May, highest rated player on Shogi Club 24 is computer program Ponanza, rated 3211.^{[ citation needed ]}
• 2011: December, highest rated player on Shogi Club 24 is computer program Bonkras, rated 3364 after 2116 games.^{[ citation needed ]}
• 2012: January, Bonkras defeated the 1993 Meijin Yonenaga. They played 113 moves with main time 3 hours and then 1 minute per move. ^[6]
• 2013: 20 April, GPS Shogi defeated Hiroyuki Miura, ranked 15. Game was 102 moves with main time 4 hours then 1 minute per move. ^[76]
• 2013: 12 May, highest rated player on Shogi Club 24 is computer program Ponanza, rated 3453.^{[ citation needed ]}
• 2014: 12 April, Ponanza defeated Yashiki Nobuyuki, ranked 12. Game was 130 moves with main time 5 hours then 1 minute per move. ^[77]
• 2016: 10 April, Ponanza defeated Takayuki Yamasaki, 8-dan. Game was 85 moves. Takayuki used 7 hours 9 minutes. ^[78]
• 2017: 20 May, Ponanza defeated Meijin Amahiko Satō in 2 games. ^{[79] [80]}
• 2017: Google DeepMind's AlphaZero convincingly defeats 2017 World Computer Shogi Champion program elmo ^{[81] [82]}

See also

• List of shogi software
• Shogi variant
• Computer Chess
• Chess engine
• Chess opening book (computers)

References

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External links

• Computer versus Human Shogi Events in Japanese
• コンピュータ将棋 まとめサイト:
  • How to start computer Shogi (Japanese Chess)
  • Current ratings for development versions of shogi engines
• 将棋フリーソフト:
  • Installation instruction shogi engine (v.2019 May)
  • Instructions to set-up and play with shogi engines
  • How to install the Yaneuraou engine with third party evaluation files/opening books and the Gikou2 engine
• Nederlandse Shogi Bond: How to analyze your games using a shogi engine
• Spear a shogi engine