Make use of asymmetric SEE

zamar · zamar · commit 7bad50773a65 · 2013-04-05T19:05:32.000+01:00
diff --git a/src/search.cpp b/src/search.cpp
@@ -1228,7 +1228,7 @@ namespace {
           // Prune moves with negative or equal SEE
           if (   futilityBase < beta
               && depth < DEPTH_ZERO
-              && pos.see(move) <= 0)
+              && pos.see_asymm(move, beta - futilityBase) <= 0)
           {
               bestValue = std::max(bestValue, futilityBase);
               continue;

Original file line number	Diff line number	Diff line change
`@@ -1228,7 +1228,7 @@ namespace {`
`1228`	`1228`	`// Prune moves with negative or equal SEE`
`1229`	`1229`	`if ( futilityBase < beta`
`1230`	`1230`	`&& depth < DEPTH_ZERO`
`1231`		`- && pos.see(move) <= 0)`
	`1231`	`+ && pos.see_asymm(move, beta - futilityBase) <= 0)`
`1232`	`1232`	`{`
`1233`	`1233`	`bestValue = std::max(bestValue, futilityBase);`
`1234`	`1234`	`continue;`