Search found 16846 matches

by bob
Sun Jun 10, 2007 3:25 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Revisiting Check Extensions
Replies: 18
Views: 10992

Re: Revisiting Check Extensions

Basing this on material has a couple of dangers: (1) if you don't extend checks that lose material, what happens to you on positions like WAC 141 where the key move tosses the queen for no apparent gain? I see no reason why people here keep giving single exceptional positions when new ideas are pre...
by bob
Sun Jun 10, 2007 2:24 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Observator bias or...
Replies: 51
Views: 54020

Re: Observator bias or...

Well, excuse me for saying so, but if all you said was that 80 games is not enough, then I don't understand why you said that at all. As the topic under discussion, or at least the one that I addressed and that you reacted on, was the one raised by Uri, if it is preferable to test based on time or ...
by bob
Sat Jun 09, 2007 10:01 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: pthread weirdness
Replies: 26
Views: 13024

Re: pthread weirdness

Doing dumb tests with nonstop locking and unlocking is not a good idea. Better is simply to run Glaurung and see how it works out. I'm sorry for not expressing myself more clearly: Comparing the speeds of Glaurung with different types of locks was of course exactly what I did. Plain old mutex locks...
by bob
Sat Jun 09, 2007 9:59 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Revisiting Check Extensions
Replies: 18
Views: 10992

Re: Revisiting Check Extensions

Basing this on material has a couple of dangers: (1) if you don't extend checks that lose material, what happens to you on positions like WAC 141 where the key move tosses the queen for no apparent gain? I see no reason why people here keep giving single exceptional positions when new ideas are pre...
by bob
Sat Jun 09, 2007 1:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Observator bias or...
Replies: 51
Views: 54020

Re: time for some real data

Yes, and now I would be interested to see a similar picture where you did not give both programs equal time, but in stead an equal number of nodes. (Or, if that setting is not supported, and equal search depth.) Only then we could conclude if this makes the variability better or worse... If you giv...
by bob
Sat Jun 09, 2007 1:40 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Help Finding X
Replies: 9
Views: 5010

Re: Help Finding X

In the endgame, many positions are hopeless draws which can almost be determined via static analysis, after a certain depth of conversion. For example. lets say we get down to K&R vs K&R. Unless one side has a K and R along the same file or column, apart a bit, the other side can only get a draw (i...
by bob
Fri Jun 08, 2007 4:03 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Revisiting Check Extensions
Replies: 18
Views: 10992

Re: Revisiting Check Extensions

Tony wrote:[D]5r1k/6p1/1n2Q2p/4p3/8/7P/PP4PK/R1B1q3 w - 0 1
Didn't even think about the diagram ability. :)

thanks...
by bob
Fri Jun 08, 2007 4:02 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Observator bias or...
Replies: 51
Views: 54020

time for some real data

Here are 32 80-game matches, with +=a win, -=a loss and = means drawn. The 80 game matches are between the two same opponents, same 40 starting opening positions one with white one with black, same time control, same everything. Look at this and then tell me that two programs play the same games oft...
by bob
Fri Jun 08, 2007 3:25 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Revisiting Check Extensions
Replies: 18
Views: 10992

Re: Revisiting Check Extensions

Most programs I have seen seem to extend checks exactly one full ply. Some also extend one reply to checks another full ply (or sometimes less). A very few use an extession of 3/4 a ply. In my continuing experiments in my program, I have tried to come up with different criteria, and in testing they...
by bob
Fri Jun 08, 2007 3:31 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Observator bias or...
Replies: 51
Views: 54020

Re: Observator bias or...

Useful -> something that produces information that is of some use. In this case, a random set of 80 games chosen from a huge population of potential games simply doesn't provide any useful information. See the 5 matches I posted. Pick any one of the 5 and you have a 3/5 chance of being wrong (I hap...