Search found 16763 matches

by bob
Sat Aug 17, 2019 10:07 pm
Forum: Computer Chess Club: General Topics
Topic: when is a win a win and a draw a draw
Replies: 14
Views: 391

Re: when is a win a win and a draw a draw

Bob you are right the position is illegal my mistake. The point was unless a position is 100% certain that its a draw then just because black only has a knight doesn't foot the bill. To me only 2 kings and a bishop or 2 kings and a knight I think are the only 2 scenarios guaranteed a draw. Uri only...
by bob
Sat Aug 17, 2019 1:31 am
Forum: Computer Chess Club: General Topics
Topic: Congrats the Komodo Team
Replies: 32
Views: 1360

Re: Congrats the Komodo Team

that is actually pretty amazing numbers...
by bob
Thu Aug 15, 2019 4:41 am
Forum: Computer Chess Club: General Topics
Topic: when is a win a win and a draw a draw
Replies: 14
Views: 391

Re: when is a win a win and a draw a draw

This is a sticky wicket in the FIDE rules. Technically even a KB vs KB is winnable by FIDE rules since black could put his king on H8, his bishop on H7, white could have his king on F8 and moves his bishop to the a1-h8 diagonal. Nobody would play that bishop to h7 of course, but the rules... Chess s...
by bob
Wed Aug 14, 2019 6:54 pm
Forum: Computer Chess Club: General Topics
Topic: Does computer chess sponsorship exist?
Replies: 24
Views: 801

Re: Does computer chess sponsorship exist?

According to talkchess posts, Houdini was sponsored by an Arab Sheikh. I don't have any direct knowledge of that. I thought that was Hydra. They did that one too. Don't think it was Houdini. It was a program by Chrilly Donninger. Houdini has not participated in the usual computer chess tournaments,...
by bob
Wed Aug 14, 2019 6:53 pm
Forum: Computer Chess Club: General Topics
Topic: Does computer chess sponsorship exist?
Replies: 24
Views: 801

Re: Does computer chess sponsorship exist?

also when the opteron first came out, AMD provided me access to 4/8 processor machines for some of the ICC events we used to hold. Cray (as someone mentioned) gave us lots of free machine time. CDC used to provide computer time for chess 4.x.. Bell Labs supported Ken and Joe in their development of ...
by bob
Wed Aug 14, 2019 6:41 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Poor performance of Stockfish 10 against Igel 1.8.3 at (shallow) fixed depth=10
Replies: 7
Views: 861

Re: Poor performance of Stockfish 10 against Igel 1.8.3 at (shallow) fixed depth=10

Simple answer: All plies are not created equal. For an aggressive pruner like stockfish, 10 plies is an instant search. For example, I just played 20 moves with Crafty and the longest search was 0.06 seconds at sd=10. Less aggressive pruners will move slower and see more at that same depth.
by bob
Wed Aug 14, 2019 1:54 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: SYZYGY question
Replies: 7
Views: 586

Re: SYZYGY question

OK, got new version in, and that seems to be working. (I did have a bug in my code as well, but it did not show up until the ep bug was fixed. :) ) I did not think about ep captures coming back from the lookup, and basically all I get is a from and to square, and was adding the moving piece and capt...
by bob
Tue Aug 13, 2019 3:45 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: killer index by "ply" or "ply"
Replies: 16
Views: 1328

Re: killer index by "ply" or "ply"

The point is that after Nb5, at the moment that you zero the killer at ply+1, Nc7+ cannot yet be a killer. Because that killer slot was filled by a node after ANOTHER move than Nb5, so that the Knight could not possibly go to c7, as it was not on b5. Only after a follow-up move of Nb5 has been sear...
by bob
Mon Aug 12, 2019 7:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New crafty version
Replies: 9
Views: 610

Re: New crafty version

Dann Corbit wrote:
Mon Aug 12, 2019 7:17 pm
Just got back from vacation.
Where is the source code for the current version of Crafty?
Actually it is going to take a few days. Looks like there is a bug in the syzygy probe code I used. Has a problem with en passant captures...

I'll post an update when I get this resolved...
by bob
Mon Aug 12, 2019 7:22 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New crafty version
Replies: 9
Views: 610

Re: New crafty version

I just fixed a bug found by a crafty user. Basic idea was that after the syzygy implementation, I left a piece of code in iterate.c that could cause a nasty issue (playing a null move at the root and blowing up). Minor fix to solve this. If anyone is interested in distributing this, let me know and...