Author: Robert Hyatt
Date: 19:19:47 07/21/04
Go up one level in this thread
On July 21, 2004 at 19:51:21, Ed Trice wrote: >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. It wasn't a gain in my testing. I set up crafty vs MPC-crafty and played a _bunch_ of games on the older quad cluster. MPC was somewhat worse in every test I tried. Way worse in fast games, but worse overall, period. That's why it is not in the released versions... > >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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