Search found 16846 matches

by bob
Tue Jul 10, 2007 5:10 pm
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 6320

Re: difficult endgame test

What is the issue here? Is it a tablebase position or a test of the engines capability as there are quite a few things to be calculated. I ran without tablebases myself. You can see that in the statistics where there were zero EGTB probes/hits... It is more about breaking the position open rather t...
by bob
Tue Jul 10, 2007 5:04 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: iterative deepeniing and branching factor
Replies: 32
Views: 12756

Re: iterative deepeniing and branching factor

It isn't a new idea. "BeBe" went by twosies in the middle 80's as one example. I have encountered others that did so. One reason was to eliminate the odd/even ply flip-flopping of the best move when on odd ply searches the program gets one extra move compared to the opponent, while in the even-ply ...
by bob
Tue Jul 10, 2007 2:19 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: iterative deepeniing and branching factor
Replies: 32
Views: 12756

Re: iterative deepeniing and branching factor

If the branching ratio is too low, the conventional solution is deepening in larger steps, e.g. two ply at the time. Do you know of programs that do this? It isn't a new idea. "BeBe" went by twosies in the middle 80's as one example. I have encountered others that did so. One reason was to eliminat...
by bob
Tue Jul 10, 2007 5:29 am
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 6320

Re: difficult endgame test

I ran this with crafty... it finds this move at depth=11, .1 seconds, on my core2 duo laptop. by depth=18, .5 seconds, the score is in black's favor by 1/2 pawn.... by depth 21, it is 1.5 pawns in blacks favor, taking about 2 seconds... 11 0.19 2.59 1. ... g6 2. hxg6 Kxg6 3. Kh4 Kf7 4. g5 Kg7 5. Kh5...
by bob
Tue Jul 10, 2007 5:23 am
Forum: Computer Chess Club: General Topics
Topic: Are these persons incompetent ?
Replies: 52
Views: 20663

Re: Are these persons incompetent ?

one key question... have you tested the source code by compiling it and seeing how it behaves on the test positions that have been posted??? We had a case many years ago where someone entered a genius clone, but had a source code that would play chess. Just nowhere as good as genius. And when the ch...
by bob
Fri Jul 06, 2007 9:04 pm
Forum: Computer Chess Club: General Topics
Topic: Alaric in Aljechin-Sterk
Replies: 32
Views: 20234

Re: Alaric in Aljechin-Sterk

crafty on my core-2 duo 2.0ghz laptop: 17 4:30 +1 1. Bf6!! 17 7:59 +3 1. Bf6!! 17 11:47 2.98 1. Bf6 Rfc8 2. Qe5 Rc5 3. Rxc5 gxf6 4. Qg3+ Kh8 <HT> (s=4) 17-> 12:21 2.98 1. Bf6 Rfc8 2. Qe5 Rc5 3. Rxc5 gxf6 4. Qg3+ Kh8 <HT> (s=2) 18 15:51 2.99 1. Bf6 Rfc8 2. Qe5 Rc5 3. Rxc5 gxf6 4. Qg3+...
by bob
Fri Jul 06, 2007 7:02 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Compilation question for gcc experts
Replies: 12
Views: 6576

Re: Compilation question for gcc experts

I think all of that is beyond dangerous. How do you know that nothing else has been added to the stack after your alloca()? Certainly nothing in the C calling convention standard suggests that is the case. The second alloca() has no chance. This is an amount to adjust the stack by, and I don't see a...
by bob
Fri Jul 06, 2007 2:30 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Strange Perft And Divide
Replies: 4
Views: 2526

Re: Strange Perft And Divide

are you using FEN to set up the position after each of those moves? If so, are you certain you are entering the EP target square correctly?
by bob
Fri Jul 06, 2007 2:21 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Compilation question for gcc experts
Replies: 12
Views: 6576

Re: Compilation question for gcc experts

alloca() Great, thanks! I didn't know about this function. If it also allows negative argument, to deallocate part of the earlier allocated storage, it will be all I need. If not, I can reverse engineer it, to see where exactly in the stack the allocated space should be positioned. (Note that I don...
by bob
Tue Jul 03, 2007 8:39 pm
Forum: Computer Chess Club: General Topics
Topic: Bob Hyatt Crafty 21.5 and 21.6
Replies: 10
Views: 4790

Re: Bob Hyatt Crafty 21.5 and 21.6

crafty is winboard only...