[computer-go] Interesting Test Position (for UCT)

[chrilly]

Attached is an interesting testposition which occured in UCT-Suzie against Peter-Woitke. If black plays 37 c4 the game is lost by 0.5 points. If Black passes, white gets a lot of threats. Black can choose between a safe loss, or some risk and a win. UCT-Suzie and the public domain version of Crazy-Stone played the save loss. See also comments in the sgf-Files by Peter Woitke.

Alpha-Beta-Suzie plays the position right. If one replaces for such situations the Rollout by the AB-Eval also the UCT version plays correct. According our tests AB-Suzie is on 9x9 slightly stronger than UCT-Suzie. But UCT is plain-vannila, about 100h development time. AB-Suzie about 1500 h (mainly by Peter Woitke). The h/Elo ratio is much better for UCT-Suzie. Replacing always the Rollout by the AB-Eval is worse. With other words, UCT is not in generall the better tree-search. It is better for a Rollout-Eval. I think AB-Suzie is for humans more difficult, because it plays more aggressive. But sometimes too aggressive. If its ahead, it plays still risky. The UCT-version plays such positions safly home. The test is biased, because the human is always Peter Woitke. The Go-European Championship in Villach/Austria will be a better test. Chrilly

UCT_verrueckt_02.sgf
Description: Binary data

_______________________________________________
computer-go mailing list
computer-go@computer-go.org
http://www.computer-go.org/mailman/listinfo/computer-go/