American Go E-Journal

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 202017.11.11_ag-ag-zero-opening 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.

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