Code: Select all
Crafty-22.2R26-2 2587 5 5
Crafty-22.2R26-3 2599 4 4
Crafty-22.2R26-4 2608 5 5
Crafty-22.2R26-5 2579 4 4
Crafty-22.2R29-0 2597 5 5
Crafty-22.2R29-1 2597 5 5
Crafty-22.2R29-2 2598 4 4
Crafty-22.2R29-3 2597 5 5
Crafty-22.2R30-0 2597 5 5
Crafty-22.2R30-1 2594 5 5
Crafty-22.2R30-2 2598 4 4
Crafty-22.2R30-3 2597 5 5
The rather surprising results were that the one-legal-reply and mate threat extensions appear to be completely useless, and I am going to remove them completely. The in check extension is more valuable, and surprisingly 1.0 plies seems to be the optimal value...
I had already discovered that the passed pawn push extension was no good, ditto for the recapture extension. It appears that the only one that is actually useful is the give-check or in-check (in Crafty it is actually a give-check extension where I extend when I give check rather than extending at the next ply when I escape check).