Search found 16822 matches

by bob
Sat Jun 09, 2007 1:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Observator bias or...
Replies: 51
Views: 53737

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: 4901

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: 10838

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: 53737

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: 10838

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: 53737

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...
by bob
Fri Jun 08, 2007 3:22 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Long Time Control Testing
Replies: 6
Views: 3371

Re: Long Time Control Testing

I use both long time control and short time control gauntlets for testing. I've noticed reduced variability in the long time control testing which is why I do both. Anybody else noticed this? Bob mentioned something a while back that made me think he has. I never test version vs version. I only tes...
by bob
Thu Jun 07, 2007 2:18 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Observator bias or...
Replies: 51
Views: 53737

Re: Observator bias or...

search a fixed number of nodes, record the results. Make any change to the program you want. Search a fixed number of nodes and the results are absolutely useless to compare with the first run. Is that hard to understand given the data I provided above? What is hard to understand is why the results...
by bob
Thu Jun 07, 2007 2:12 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: pthread weirdness
Replies: 26
Views: 12879

Re: pthread weirdness

Note that my original testing was done when I was locking the hash table for each lookup/store, prior to adding the lockless hash from Cray Blitz. So there I was locking a _bunch_ of times per second and mutex was horrible. If you already have the lock in another thread, you block in the current thr...
by bob
Wed Jun 06, 2007 1:31 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Observator bias or...
Replies: 51
Views: 53737

Re: Observator bias or...

search a fixed number of nodes, record the results. Make any change to the program you want. Search a fixed number of nodes and the results are absolutely useless to compare with the first run. Is that hard to understand given the data I provided above? What is hard to understand is why the results...