Search found 783 matches

by elcabesa
Sun Apr 21, 2019 8:37 am
Forum: Computer Chess Club: General Topics
Topic: Contrived position for perft
Replies: 13
Views: 286

Re: Contrived position for perft

another possibile source of problem is the interaction of "pin" and en passant. I think this is rare but it can happen.
here an example where en passant capture is forbidden (fxe3)
by elcabesa
Sun Apr 21, 2019 8:31 am
Forum: Computer Chess Club: General Topics
Topic: Contrived position for perft
Replies: 13
Views: 286

Re: Contrived position for perft

if my engine is not wrong those are the results:
1: 60
2: 2608
3: 113742
4: 4812099
5: 202902054
6: 8419356881
by elcabesa
Sat Apr 20, 2019 3:17 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: No standard specification for Perft
Replies: 22
Views: 410

Re: No standard specification for Perft

In my engine I use perft and divide to test the correctness of the engine. Whit this goal, I use the same move generator, do/undo move routines and the move selector. I tested my engine in a lot of random positions and checked the result against stockfish. This helped me validating the code. Sometim...
by elcabesa
Sun Apr 14, 2019 7:23 am
Forum: Computer Chess Club: General Topics
Topic: Vajolet2 2.7 release
Replies: 6
Views: 617

Re: Vajolet2 2.7 release

Wow, after a week of CCRL games, it looks likes that Vajolet2 2.7 has gained 30 Elo point over Vajolet2 2.6 :D

a really pleasant discovery.

Thank you CCRL boys
by elcabesa
Wed Apr 03, 2019 8:44 pm
Forum: Computer Chess Club: General Topics
Topic: Vajolet2 2.7 release
Replies: 6
Views: 617

Re: Vajolet2 2.7 release

and always thank you all for your testing
by elcabesa
Wed Apr 03, 2019 8:32 pm
Forum: Computer Chess Club: General Topics
Topic: Vajolet2 2.7 release
Replies: 6
Views: 617

Vajolet2 2.7 release

With pleasure I'd like to announce the release of Vajolet2 2.7 Vajolet can be downloaded on github Release page from my onw testing I hope in an increment of 10, maybe 20 Elo Point below the long release note from github page: release note 2.7 fix: 2.6 crash debug wrong scores when draw is reached s...
by elcabesa
Fri Mar 15, 2019 10:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: CPW bitscan with reset could someone explain this line?
Replies: 9
Views: 548

Re: CPW bitscan with reset could someone explain this line?

I understand that it confuse the compiler about keeping the data in cpu register instead that in ram.
Having them in register should be faster
by elcabesa
Mon Feb 18, 2019 3:33 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On failing high and finding mates
Replies: 14
Views: 1085

Re: On failing high and finding mates

It's not correct. But I don't think this is a very big problem.
You'll get only some glitch with some gui when looking the interface.
by elcabesa
Sun Feb 17, 2019 9:47 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On failing high and finding mates
Replies: 14
Views: 1085

Re: On failing high and finding mates

I am not sure about your exact problem. An "info" line containing "lowerbound" is not a PV, so there is no need to expect a mate score in it. Maybe I somehow missed your point? in his root search after the first move has been searched it print the UCI output with the word lowerbound, then after the...