Material imbalance is certainly one of important new ideas in chess programming.
Sometimes a knight is better and sometimes a bishop, though they have approximately the same point value in general.
When should you trade a knight for a bishop (and vice versa)?
What about the aftermath of the trade (e.g. with a pawn recapture, has the altered pawn structure changed the value of the trade)?
There is a new test suite in the "Strategic Test Suite" arsenal, the fifth of the series by Swaminathan. These positions have had the stuffings pounded out of them by powerful chess engines to ensure that the answers provided are reliable. Besides the key move, there is also a list of hints in the ce that shows the relative value of alternate move choices.
Want to give it a whirl? Take a look here, and help yourself! :
http://sites.google.com/site/strategict ... -vs-knight
Bishop Verses Knight EPD test suite
Moderators: hgm, Rebel, chrisw
-
- Posts: 12540
- Joined: Wed Mar 08, 2006 8:57 pm
- Location: Redmond, WA USA
-
- Posts: 792
- Joined: Wed Jul 19, 2006 9:58 am
Re: Bishop Verses Knight EPD test suite
Thank you!!
Richard
Richard
-
- Posts: 6401
- Joined: Thu Mar 09, 2006 8:30 pm
- Location: Chicago, Illinois, USA
Re: Bishop Verses Knight EPD test suite
Gaviota, "Flock version" 0.68.1Dann Corbit wrote:Material imbalance is certainly one of important new ideas in chess programming.
Sometimes a knight is better and sometimes a bishop, though they have approximately the same point value in general.
When should you trade a knight for a bishop (and vice versa)?
What about the aftermath of the trade (e.g. with a pawn recapture, has the altered pawn structure changed the value of the trade)?
There is a new test suite in the "Strategic Test Suite" arsenal, the fifth of the series by Swaminathan. These positions have had the stuffings pounded out of them by powerful chess engines to ensure that the answers provided are reliable. Besides the key move, there is also a list of hints in the ce that shows the relative value of alternate move choices.
Want to give it a whirl? Take a look here, and help yourself! :
http://sites.google.com/site/strategict ... -vs-knight
AMD 2x 2.4 Ghz (2 cores used), 16MB hash tables.
10 seconds/test
average nps: 572564
solved: 65
wrong : 35
ratio : 65.00%
Miguel
-
- Posts: 161
- Joined: Thu Jan 08, 2009 9:06 pm
- Location: San Francisco, USA
Re: Bishop Verses Knight EPD test suite
Plisk 0.1.2 Phenom running on AMD Phenom 2.6Ghz (using 1 core only and 128Mb hash):
10 sec/move - 67/100 (67%)
gen> nNodes: 729653264 nQSNodes: 160044559 branchFactor: 3.64 avgDepth: 10.7
Regards,
Vlad.
10 sec/move - 67/100 (67%)
gen> nNodes: 729653264 nQSNodes: 160044559 branchFactor: 3.64 avgDepth: 10.7
Regards,
Vlad.
-
- Posts: 166
- Joined: Wed Mar 08, 2006 9:49 pm
- Location: S. New Jersey, USA
Re: Bishop Verses Knight EPD test suite
Thanks to you guys for these tests!
10 sec / pos ; 1 core of core 2 duo 2 Ghz ; 375 Knps
Xpdnt gets 79/100 [this includes the 'alternate' moves]
It seemed to me, [just by 'eye'] that it favored the Bishop more than the knight. ... gives me reason to experiment with that a bit.
Thanks again.
10 sec / pos ; 1 core of core 2 duo 2 Ghz ; 375 Knps
Xpdnt gets 79/100 [this includes the 'alternate' moves]
It seemed to me, [just by 'eye'] that it favored the Bishop more than the knight. ... gives me reason to experiment with that a bit.
Thanks again.
-
- Posts: 6640
- Joined: Thu Mar 09, 2006 4:21 am
Re: Bishop Verses Knight EPD test suite
Thanks to you all for reporting the results from your engines! Keep 'em coming!!
It should be noted though that Dann put several hundreds of analysis into tests with top engines and he did a careful selection which is impressive. He is an expert when it comes to test suite selections, owing to his years of experience. Great to work with him.
It should be noted though that Dann put several hundreds of analysis into tests with top engines and he did a careful selection which is impressive. He is an expert when it comes to test suite selections, owing to his years of experience. Great to work with him.
-
- Posts: 6640
- Joined: Thu Mar 09, 2006 4:21 am
Re: Bishop Verses Knight EPD test suite
By the way, If any of you would like to send a short 1-2 line testimonials/feedback, I'd be sure to put them with your name and the name of your engine, in the site here:
http://sites.google.com/site/strategict ... stimonials
So feel free to send words to me via pm or here.
We will keep working on it together, Have plans to release 20 more test suites in the series!!
Ideas for future test suites are outlined here:
http://sites.google.com/site/strategict ... al-ideas-1
http://sites.google.com/site/strategict ... stimonials
So feel free to send words to me via pm or here.
We will keep working on it together, Have plans to release 20 more test suites in the series!!
Ideas for future test suites are outlined here:
http://sites.google.com/site/strategict ... al-ideas-1
-
- Posts: 6401
- Joined: Thu Mar 09, 2006 8:30 pm
- Location: Chicago, Illinois, USA
Re: Bishop Verses Knight EPD test suite
1 minute/ positionmichiguel wrote:Gaviota, "Flock version" 0.68.1Dann Corbit wrote:Material imbalance is certainly one of important new ideas in chess programming.
Sometimes a knight is better and sometimes a bishop, though they have approximately the same point value in general.
When should you trade a knight for a bishop (and vice versa)?
What about the aftermath of the trade (e.g. with a pawn recapture, has the altered pawn structure changed the value of the trade)?
There is a new test suite in the "Strategic Test Suite" arsenal, the fifth of the series by Swaminathan. These positions have had the stuffings pounded out of them by powerful chess engines to ensure that the answers provided are reliable. Besides the key move, there is also a list of hints in the ce that shows the relative value of alternate move choices.
Want to give it a whirl? Take a look here, and help yourself! :
http://sites.google.com/site/strategict ... -vs-knight
AMD 2x 2.4 Ghz (2 cores used), 16MB hash tables.
10 seconds/test
average nps: 572564
solved: 65
wrong : 35
ratio : 65.00%
Miguel
average nps: 602136
solved: 74
wrong : 26
ratio : 74.00%
Miguel
-
- Posts: 1766
- Joined: Wed Jun 03, 2009 12:14 am
Re: Bishop Verses Knight EPD test suite
those seem like fantastic results for an amateur engine!
i dont know that a bias towards retaining the bishop pair is a bad thing. (though i realize thats not necessarily what you say the case is)
i dont know that a bias towards retaining the bishop pair is a bad thing. (though i realize thats not necessarily what you say the case is)
-
- Posts: 481
- Joined: Thu Apr 16, 2009 12:00 pm
- Location: Slovakia, EU
Re: Bishop Verses Knight EPD test suite
Critter 0.41 (development version):
10 sec / position on Athlon64 4200+
73 of 100 matching
10 sec / position on Athlon64 4200+
73 of 100 matching