Author: Ed Trice
Date: 16:51:21 07/21/04
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Actually, ProbCut worked best when applied to the game of Othello (reversi). There is another variation of ProbCut called Multi-ProbCut (MPC) which was hooked up to the Crafty version you mentioned. The gain was minimal, but it was measureable and it did help the program's performance. But, there was also a big change in crafty since that time to correct some bad passed pawn code. [D] 8/7p/8/4pp1k/8/r6P/P5R1/6K1 b - - Before Crafty 19.13, Black to move would show ...Rxj3?? with a big positive score, which loses on the c-pawn is launched. If you use Crafty 19.13 or later, you shoud see it instantly avoiding this line of play altoether. I just mention this since if you do download the older crafty with MPC hooked up, make sure you change the most-recent split_passed_pawn stuff. >Hi, > >This is probably old news to many, but I ran across the pages of Michael Buro >(http://www.cs.ualberta.ca/~mburo/), and saw an article on ProbCut, highly >recommending it, and even mentioning its inclusion in a version of Crafty 18.15. > >"ProbCut works in chess on top of null-move search! Download >mpc_crafty_18.15.tgz to play with it. We encourage all chess programmers to >experiment with ProbCut!" > >One can download the article "ProbCut: An Effective Selective Extension of the >Alpha-Beta Algorithm" on his page of publications >(http://www.cs.ualberta.ca/~mburo/publications.html) as well as a follow-up >article "A.X. Jiang and M. Buro, First Experimental Results of ProbCut Applied >to Chess", Proceedings of the Advances in Computer Games Conference 10, Graz >2003. > >For new programmers looking for material, this is certainly one, plus it might >be added to the links in the Computer Chess Resource Center. > > Albert
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