by John Power, Japan Correspondent for the E-Journal
Iyama and Xie to meet in LG Cup final: A Japanese representative had made the best eight of the 22nd LG Cup, so the Nihon Ki-in offered to host the quarterfinals and semifinals at its headquarters in Tokyo. If one motive was to give its player the advantage of playing on home ground, this worked out just right, as Japan got its first finalist in a world championship since 2007. That year was also the only previous time that Japan hosted LG Cup games. All the games were telecast with live commentary on the Igo & Shogi Channel.
The quarterfinals were played on November 13. The results were as follows: Ke Jie 9P (China) (W) beat Shin Jinseo 8P (Korea) by resig.; Xie Erhao 5P (China) (W) beat Choi Cheolhan 9P (Korea) by resig.; Jiang Weijie 9P (China) (W) beat Lee Wonyong 7P (Korea) by half a point; Iyama Yuta 9P (Japan) (W) beat Yang Tingxin 6P (China) by resig.
The LG Cup is a Korean-sponsored tournament, but no Korean players made the
semifinals, so perhaps Korean fans didn’t mind the tournament’s being held overseas. Lots are drawn after each round to do the pairings for the next round, and Iyama (at right in photo at left) was paired with Ke Jie (left), who is widely recognized as the world’s number one. In this tournament, the player who wins the nigiri can choose colors; Ke (right) took white—perhaps he was influenced by the fact that White won all the games in the quarterfinals. He started out with two three-three points, showing the influence of AI. In contrast, Iyama played the high Chinese Opening. Initially, Ke took the lead, but in a later fight his play was perhaps a little too aggressive, letting Iyama get back into the game. Later on, Ke made a mistake and resigned after 267 moves. In the all-Chinese semifinal, Xie (W) Jiang beat by resig.
The best-of-three final will be held on February 5, 7, and, if needed, 8. Iyama has won the TV Asia Cup, but this will be his first final in a full-scale international tournament. If he wins, it will be Japan’s first international title since 2005, when Cho U won the LG Cup. Unfortunately, I have no information about Xie Erhao.
Ida defends Crown title: The Crown tournament is open only to players at the Central Japan (Nagoya) branch of the Nihon Ki-in. First prize is 1.7 million yen (about $15,400). Ida Atsushi 8P won this title for the first time last year and was able to defend it this year. The one-game final was played on November 13; taking white, Ida defeated Mutsuura Yuta 7P by resig. after 174 moves.
Tomorrow: Shibano picks up first league win; Fujisawa levels score in Women’s Honinbo; Suzuki makes Tengen main tournament; Iyama increases lead in Oza
AlphaGo Zero-AlphaGo Master: Two openings, less variety
Saturday November 11, 2017
“In the set of 20 games between AG Zero and AG Master, there are pretty much just two openings — i.e. identical moves for about the first 20
moves — one with Zero as Black and one with Master as Black,” says Michael Redmond 9p in this first commentary on the recently released AG Zero games. “This provides an opportunity to examine how Zero differs from Master, as well as how Master differs from earlier versions. ”
“When AGMaster plays against AGZero, it does not show the variety that it had before,” says Redmond. “As AG does not change within a version, I find it hard to accept that it apparently does not have the option to play moves that it played before in identical board positions. In the ‘Master series’, 60 games played against top pros in Dec 2016 to Jan 2017, Master could play the 3-4 point as it’s first move in about 1/4 of the games when it had Black. Incidentally, AGKeJie also could play the 3-4 point in some of it’s games. The fact that Master repeats the same opening every time in these games against AGZero bothers me and makes me question, is this truly the same version of AGMaster that played the Master series, and if so, what caused it to play the same opening every time in this series, when it was allowed to have variety in previous games with identical board positions? The difference in calculated winning percentage between A and B should be extremely small and I would expect it to have little or no effect on the ultimate win-loss record. This set of games would be much more valuable if Master had been allowed to vary in it’s choices for moves.”
Click here for Redmond’s video commentary, hosted by the AGA E-Journal’s Chris Garlock, and see below for the two sgf commentaries. Note that these commentaries focus only on the two openings; watch for a full-game Zero-Master commentary next week. Click here for a playlist of all the Redmond AG commentaries.
Video produced by Michael Wanek and Andrew Jackson. The sgf files were created by Redmond, with editing and transcription by Garlock and Myron Souris.
[link]
[link]