Double Impact of Gain tables

zamar · mcostalba · commit 36c82b751ce2 · 2013-04-03T19:14:59.000+02:00
Very unorthodox idea.

After 16000 games at 60"+0.05
ELO: 3.14 +-3.4 (95%) LOS: 96.6%
Total: 13407 W: 2278 L: 2157 D: 8972

bench: 4705335
diff --git a/src/search.cpp b/src/search.cpp
@@ -875,7 +875,7 @@ namespace {
           // but fixing this made program slightly weaker.
           Depth predictedDepth = newDepth - reduction<PvNode>(depth, moveCount);
           futilityValue =  ss->staticEval + ss->evalMargin + futility_margin(predictedDepth, moveCount)
-                         + Gain[pos.piece_moved(move)][to_sq(move)];
+                         + 2 * Gain[pos.piece_moved(move)][to_sq(move)];
 
           if (futilityValue < beta)
           {

Original file line number	Diff line number	Diff line change
`@@ -875,7 +875,7 @@ namespace {`
`875`	`875`	`// but fixing this made program slightly weaker.`
`876`	`876`	`Depth predictedDepth = newDepth - reduction<PvNode>(depth, moveCount);`
`877`	`877`	`futilityValue = ss->staticEval + ss->evalMargin + futility_margin(predictedDepth, moveCount)`
`878`		`- + Gain[pos.piece_moved(move)][to_sq(move)];`
	`878`	`+ + 2 * Gain[pos.piece_moved(move)][to_sq(move)];`
`879`	`879`
`880`	`880`	`if (futilityValue < beta)`
`881`	`881`	`{`