American Go E-Journal » 2012 » March

Taking just a four-stone handicap on a full board, the Zen computer go program defeated Takemiya Masaki 9P on March 17. The legendary pro played two games against Zen as part of the 6th E&C Symposium in Japan. In the first game Zen received a five stone handicap and won by 11 points. After that the handicap was reduced to four stones, but Zen surprised many by winning again, this time by 20 points. Zen — aka Zen19 — was written by programmer Yoji Ojima and ran on hardware provided by Kato Hideki, of team DeepZen. According to Hideki, the hardware for this match was a mini-cluster of four PCs (a dual 6-core Xeon X5680/4.2 GHz, a 6-core Xeon W3680/4 GHz and two 4-core i7 920/3.5 GHz) connected via a GbE LAN. This is the same hardware used by Zen’s ‘zen19s’ and ‘zen19d’ accounts on KGS. Both of the games were played with 30 minutes main time and 60 seconds byo-yomi. Zen is currently ranked 5 dan when playing under similar time conditions on KGS. Earlier in the day, another pro, Ohashi Hirofumi 5P played two even games on 9×9 against Zen. The result was one win each. While winning against a pro with four stones is very impressive and shows how far computers have come in go, it’s clear that Zen was able to win these games by avoiding fighting to a certain extent and relying on its excellent positional judgement, raising the question of whether Zen and other programs will continue to improve steadily as the handicap is reduced and they’re forced to play a more risky style.
– adapted from David Ormerod’s report on GoGameGuru, which includes both Takemiya-Zen game records. Photo: Takemiya Masaki 9P.

Kiseido has just issued Modern Master Games, Volume One, The Dawn of Tournament Go in hard-copy; it was first released in September 2011 (Modern Master Games & More New Releases from SmartGo Books 9/19 EJ) in digital format by SmartGo Books. A survey of Japanese go from the founding of the Honinbo tournament in the 1940s to the Meijin and Judan tournaments in the 1960s, Modern Master Games was written by by Rob van Zeijst and Richard Bozulich, with historical notes by John Power. It includes 11 games, including the “Atomic Bomb Game” between Iwamoto and Hashimoto, analyzed in detail and tied together with a historical commentary by John Power. The games in this book were played in turbulent times. When the first Honinbo tournament was established in 1941, the war had not yet seriously affected the Japanese go world or the daily life of the average Japanese. But by the time of the third Honinbo tournament, Japanese society was in chaos — bullets were whizzing overhead during the first game of the title match and the atomic bomb was dropped just 10 kilometers from where the second game was being played. After the war, life slowly returned to normal. By the 1950s, the go world was again abuzz. Rivalries were flourishing, and newspapers were establishing new tournaments with abundant prize money. As the post-war go world was reorganizing itself, the matches played were of much consequence — it became more than just winning a title. The results were to determine the organizations that governed the game in Japan until today. The pressures on the players were intense, and it exposed their psychological strengths as well as fragilities. Takagawa’s games in this book show how dangerous it is to underestimate an opponent. It was almost unbelievable to some that the mild-mannered Takagawa, whose quiet and laid-back style, never attacking too strongly and lacking the brilliance of a player like Sakata, could hold the Honinbo title against all comers for nearly a decade. Sakata’s games are good illustrations of the slashing style which earned him the moniker Razor-Sharp Sakata. We also see examples of the depth of his analysis when he makes an unorthodox peep (dubbed the tesuji of the century) against Fujisawa Shuko that entails another tesuji 15 moves later whose consequences also have to be analyzed. The fact that both Sakata and Fujisawa could read this deeply and accurately shows that the level of their play was second to none. Fujisawa Hosai was another important player of this era — his power on the go board was likened to that of a bulldozer. He had a penchant for playing imitation go, but this was, as explained in the commentary on one of his games, a well thought-out strategy that he used to take advantage of the komi system that had been recently adopted. photo: Hashimoto Utaro (l) and Go Seigen (r) in 1947; photo courtesy Go Igo Weiqi Baduk blog.