Null moves gain

Programming Topics (Computer Chess) and technical aspects as test techniques, book building, program tuning etc

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Null moves gain

Postby geko » 13 May 2010, 17:05

how many ELOs does one gain using a version with null moves instead of one without?
Posts: 11
Joined: 03 Sep 2008, 23:14

Re: Null moves gain

Postby Dann Corbit » 13 May 2010, 21:30

You gain a lot with null move. After change from mini-max to alpha-beta, this is the second most significant enhancement.
I guess 100 Elo, but it will depend on the engine.

It tends to be a bit fiddly to get it right, so examine some code from other engines (E.g. the make/unmake are slightly different, and the rules for when to do it and when not to do it are fiddly too).

Vincent's double null move rule is the easiest way to implement it and always stay out of trouble with it.
Dann Corbit

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