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Futility pruning till ply 6 included

Seems good:

After 796 games: +211 = 393 -192 +8 elo

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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1 parent d11426c commit 2feb9d5100038038b371c91562bbf5342a815c39 @mcostalba committed Dec 24, 2008
Showing with 5 additions and 3 deletions.
  1. +5 −3 src/search.cpp
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@@ -1314,12 +1314,14 @@ namespace {
continue;
// Value based pruning
- if (depth < 6 * OnePly && approximateEval < beta)
+ if (depth < 7 * OnePly && approximateEval < beta)
{
if (futilityValue == VALUE_NONE)
futilityValue = evaluate(pos, ei, threadID)
- + (depth < 2 * OnePly ? FutilityMargin1
- : FutilityMargin2 + (depth - 2*OnePly) * 32);
+ + (depth < 2 * OnePly ? FutilityMargin1 :
+ + (depth < 6 * OnePly ? FutilityMargin2 + (depth - 2*OnePly) * 32
+ : FutilityMargin2 + (depth - 2*OnePly) * 64));
+
if (futilityValue < beta)
{
if (futilityValue > bestValue)

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