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Merge futility pruning from Glaurung 2.2

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It seems much more powerful then previous one.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-12-23 12:01:48 +01:00
parent e3b03f13b3
commit e96f56adfa
2 changed files with 7 additions and 7 deletions
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12
src/search.cpp
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@@ -166,7 +166,7 @@ namespace {
// nodes, and at pre-frontier nodes
Value FutilityMargin0 = Value(0x80);
Value FutilityMargin1 = Value(0x100);
Value FutilityMargin2 = Value(0x300);
Value FutilityMargin2 = Value(0x200);
// Razoring
Depth RazorDepth = 4*OnePly;
@@ -1308,18 +1308,18 @@ namespace {
&& !moveIsCapture
&& !move_promotion(move))
{
// History pruning. See ok_to_prune() definition.
// History pruning. See ok_to_prune() definition
if ( moveCount >= 2 + int(depth)
&& ok_to_prune(pos, move, ss[ply].threatMove, depth))
continue;
// Value based pruning.
if (depth < 3 * OnePly && approximateEval < beta)
// Value based pruning
if (depth < 6 * OnePly && approximateEval < beta)
{
if (futilityValue == VALUE_NONE)
futilityValue = evaluate(pos, ei, threadID)
+ (depth < 2 * OnePly ? FutilityMargin1 : FutilityMargin2);
+ (depth < 2 * OnePly ? FutilityMargin1
: FutilityMargin2 + (depth - 2*OnePly) * 32);
if (futilityValue < beta)
{
if (futilityValue > bestValue)