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Tone down a bit futility parameters

After 999 games at 1+0

Mod vs Orig +239 =542 -218  +7 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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1 parent 889c853 commit bc35f4c42d367ef080d54ae381d13ed35b4fbecf @mcostalba committed Nov 22, 2009
Showing with 2 additions and 2 deletions.
  1. +2 −2 src/search.cpp
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4 src/search.cpp
@@ -177,7 +177,7 @@ namespace {
const Value FutilityMarginQS = Value(0x80);
// Each move futility margin is decreased
- const Value IncrementalFutilityMargin = Value(0xA);
+ const Value IncrementalFutilityMargin = Value(0x8);
// Remaining depth: 1 ply 1.5 ply 2 ply 2.5 ply 3 ply 3.5 ply
const Value FutilityMargins[12] = { Value(0x100), Value(0x120), Value(0x200), Value(0x220), Value(0x250), Value(0x270),
@@ -1473,7 +1473,7 @@ namespace {
{
if (futilityValue == VALUE_NONE)
futilityValue = evaluate(pos, ei, threadID)
- + 64*(1+bitScanReverse32(int(depth) * int(depth)));
+ + 64*(2+bitScanReverse32(int(depth) * int(depth)));
futilityValueScaled = futilityValue - moveCount * IncrementalFutilityMargin;

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