Author: Jorge Pichard
Date: 13:35:20 04/02/04
Go up one level in this thread
On April 02, 2004 at 14:23:31, Uri Blass wrote: >On April 02, 2004 at 13:53:03, Tord Romstad wrote: > >>On April 02, 2004 at 13:01:02, Matthias Gemuh wrote: >> >>>Hi Tord, >> >>Hi Matthias! >> >>>I think the next version of Gothmog shall be "of commercial strength". >> >>Thanks for the kind words, but I think you are too optimistic. And even if it >>will some >>day achieve "commercial strength", it will never be of "commercial quality". >> >>>You deserve the money. >> >>I don't want money. I want people to have fun and be happy, and computer chess >>in general (not only my engine) to advance. :-) > >In that case I hope that you will support my idea of general search code. >The idea is to have code(not chess related) that can be used for chess and for >other games when people can use it for chess and for other games. > >I plan to think later again about improvement for that code and to add >information. > >I think that it is important to have a small tree with probabilities for every >move that the program remembers and modify during the search. > >I think that evaluation of every node in terms of probabilities and not in a >number is also important(not only in chess) and I may add in the general search >code something about it. > >I can give an example > >A good evaluation can evaluate that black has 0 chances to win here(I think that >it is a draw but assume for the discussion that there is no knowledge to be sure >about it) > >[D]5rk1/6pp/8/8/8/8/5PPP/5RK1 w - - 0 1 Interesting position, NOT even the top program like Shredder8 can evaluate it as draw New game Analysis by Shredder 8: 1.f4 Rd8 2.Rc1 Kf7 3.Rc7+ Kf6 4.g4 ± (0.97) Depth: 1/1 00:00:00 1.f4 Rd8 2.Rc1 Kf7 3.Rc7+ Kf6 4.g4 ± (0.97) Depth: 6/14 00:00:00 1.f4 Rd8 2.Rc1 Kf7 3.Rc7+ Kf6 4.g4 ± (0.97) Depth: 6/14 00:00:00 1.f4 Rd8 2.Rc1 Kf7 3.Rc7+ Kf6 4.g4 ± (0.97) Depth: 6/14 00:00:00 1.f4 Rd8 2.Rc1 Kf7 3.Rc7+ Kf6 4.g4 ± (0.97) Depth: 6/14 00:00:00 1.f4 Rd8 2.Rc1 Kf7 3.Rc7+ Kf6 4.g4 ± (0.97) Depth: 6/14 00:00:00 1.f4 Rd8 2.Rc1 Kf7 3.Rc7+ Kf6 4.g4 ± (0.97) Depth: 6/14 00:00:00 1.f4 Rc8 2.Kf2 Rc4 3.Ke3 Kf7 ± (0.97) Depth: 6/14 00:00:00 1.f3 Rc8 2.Kf2 Rc4 ± (0.98) Depth: 6/14 00:00:00 1.f3 Kf7 2.Re1 Rd8 3.Kf2 Ra8 ± (0.99) Depth: 6/14 00:00:00 1.f3 Kf7 2.Kf2 Kf6 3.Re1 Rd8 4.Kg3 ± (0.97) Depth: 7/11 00:00:00 13kN 1.f4 Rd8 2.Kf2 Ra8 ± (0.98) Depth: 7/11 00:00:00 15kN 1.f4 Kf7 2.Re1 Kg6 3.g3 Kf5 4.Kf2 ± (0.99) Depth: 7/12 00:00:00 18kN 1.f4 Rb8 2.Rc1 Kf7 3.Rc7+ Kf6 4.Kf2 Rb1 5.g3 ± (1.00) Depth: 8/18 00:00:00 37kN 1.Rb1 Rc8 2.g3 Kf7 3.Rb6 Rf8 ± (1.01) Depth: 8/18 00:00:00 44kN 1.Rb1 Rc8 2.g3 Kf7 3.Rb7+ Kf6 4.Kg2 ± (1.01) Depth: 8/18 00:00:00 47kN 1.Rb1 Kf7 2.Rb6 Rc8 3.g3 Rc4 ± (1.03) Depth: 9/22 00:00:00 75kN 1.Re1 Rd8 2.f4 Rd2 3.Re7 Kf8 4.Ra7 Rf2 ± (1.04) Depth: 9/22 00:00:00 96kN 1.Re1 Rd8 2.f4 Kf7 3.Kf2 Rd3 4.g4 Rd2+ 5.Re2 Rd1 ± (1.04) Depth: 9/22 00:00:00 98kN 1.Re1 Kf7 2.f4 Rc8 3.Kf2 g6 4.g3 Kf6 ± (1.06) Depth: 10/19 00:00:00 142kN 1.f4 Rf5 2.g4 Rc5 3.Kf2 Rc2+ 4.Kg3 Kf7 ± (1.07) Depth: 10/26 00:00:00 175kN 1.f4 Kf7 2.Re1 ± (1.07) Depth: 10/26 00:00:00 191kN 1.f4 Kf7 2.Re1 Rc8 3.Kf2 Kg6 4.g4 Rc2+ 5.Re2 Rc1 ± (1.07) Depth: 11/20 00:00:01 235kN 1.f4 Kf7 2.Re1 Kg6 3.g3 Rc8 4.Kf2 Rc2+ 5.Re2 Rc4 ± (1.07) Depth: 12/22 00:00:01 340kN 1.f4 Rd8 2.Kf2 Rd2+ 3.Kf3 Rd3+ 4.Ke2 Rc3 5.Re1 g6 6.Kd2 Rb3 7.h3 ± (1.07) Depth: 13/26 00:00:02 732kN 1.f4 Rd8 2.Kf2 Rd2+ 3.Kf3 Rd3+ 4.Ke2 Ra3 5.Re1 Kf7 6.Kf2 Kg6 7.g3 Kf5 8.Re5+ Kg6 9.h4 Kf6 10.Re8 ± (1.08) Depth: 14/28 00:00:04 1257kN 1.f4 Rc8 2.g3 Kf7 3.Kg2 Rc2+ 4.Rf2 Rc3 5.Re2 Kf6 6.Kh3 Rc4 7.Kh4 Kf5 ± (1.10) Depth: 15/30 00:00:09 2902kN 1.f4 Ra8 2.g3 g6 3.Re1 Kf7 4.Kf2 Ra2+ 5.Re2 Ra1 ± (1.10) Depth: 16/31 00:00:15 4697kN 1.f4 Rb8 2.Re1 Rb2 3.Re7 h6 4.g3 Kh7 5.f5 h5 6.f6 Kg6 7.fxg7 Rb1+ 8.Kg2 Rg1+ 9.Kxg1 ± (1.12) Depth: 17/33 00:00:30 9395kN 1.f4 Rc8 2.g3 Rc4 3.Re1 Rc2 4.Re7 Kf8 5.Rb7 Rc1+ 6.Kg2 Rc4 7.h3 Rc8 ± (1.12) Depth: 18/36 00:00:42 13205kN 1.g3 Kf7 2.Kg2 Kg6 3.f4 Kh5 ± (1.13) Depth: 18/36 00:01:05 20327kN 1.g3 Kf7 2.Kg2 Ra8 3.f4 Ra3 4.Rb1 Ra2+ 5.Kh3 Rf2 6.Rb7+ Kf6 7.Rb6+ Kf5 8.Rb7 Kg6 9.Ra7 ± (1.13) Depth: 18/36 00:01:14 23055kN 1.g3 g5 2.f4 gxf4 3.gxf4 Kg7 4.Kg2 Ra8 5.Kf3 ± (1.12) Depth: 19/38 00:01:45 32716kN 1.f4 Kf7 2.Kf2 Kg6 3.g3 Kf5 4.Re1 Rb8 5.Re5+ Kg6 ± (1.13) Depth: 19/38 00:01:48 33628kN 1.f4 Rb8 2.Re1 Rb2 3.Re7 h6 4.g3 Rc2 5.h3 Kh7 6.g4 Rd2 7.f5 Rc2 ± (1.15) Depth: 19/38 00:02:33 47286kN 1.f4 Ra8 2.g3 Kf7 3.Kg2 Kg6 4.Rb1 Ra2+ 5.Kh3 Kf5 6.Rb7 Ke4 7.Rxg7 h5 8.Kh4 Rxh2+ 9.Kg5 Ra2 ± (1.16) Depth: 20/38 00:03:34 65962kN 1.f4 Kf7 2.g3 Kf6 3.Kg2 Rb8 4.Kf3 h5 5.Re1 Rb3+ 6.Re3 Rb5 7.Rc3 ± (1.19) Depth: 21/39 00:05:28 100534kN 1.f4 Rb8 2.Kf2 h5 3.Re1 Kf7 4.Re5 Rb2+ 5.Kg3 g6 6.Kf3 Rb3+ 7.Re3 Rxe3+ 8.Kxe3 Ke6 ± (1.21) Depth: 22/42 00:11:27 211267kN 1.f4 Ra8 2.g3 Kf7 3.Kg2 Kf6 4.Kf3 h5 5.Re1 Ra2 6.Re2 Ra3+ 7.Re3 Ra2 8.h3 Ra3 ± (1.22) Depth: 23/43 00:16:45 308795kN 1.f4 Ra8 2.g3 Kf7 3.Kg2 Kf6 4.Kf3 h5 5.Re1 Ra3+ 6.Re3 Ra2 7.Re2 Ra3+ 8.Re3 Ra2 9.Re2 Ra3+ 10.Re3 Ra2 ± (1.22) Depth: 24/44 00:22:41 396804kN 1.f4 Ra8 2.g3 Kf7 3.Kg2 Ra5 4.h3 h5 5.g4 ± (1.22) Depth: 25/47 00:32:51 583668kN 1.f4 Ra8 2.Kf2 Kf7 3.g4 Ra3 4.Rb1 h6 5.Kg2 g6 6.h3 Ra2+ 7.Kg3 Ra3+ 8.Kh4 Ra4 ± (1.24) Depth: 26/49 01:19:11 1383446kN (Pichard, MyTown 02.04.2004) > >If you evaluate the root position as equal you may want to prune this position >based on your probabilities when the remaining depth is not important when >another position when black is a piece down may be interesting to search because >you evaluate it as 90% win for white but 5% win for black so continue to search >may reveal this information. > >see http://www.talkchess.com/forums/1/message.html?357887 for my last post in >this subject. > >My code still does not code special code that is using some function to evaluate >probabilities of win,draw,loss but I think that general code should allow this >possibility(there is also need to add general hash code and general iterate >code). > >I plan to think about the problem and I may post more code later and if you can >help me by looking at the code and post your ideas it may be productive. > >Uri
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