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Depth dependant singular extension margin

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After 7965 games:
Mod vs Orig 1324 - 1249 - 5392  ELO +3 (+- 4.4) LOS 81%

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-02-17 08:24:35 +01:00
parent 0fcda095df
commit 23cbb221b2
1 changed files with 1 additions and 5 deletions
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6
src/search.cpp
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@@ -209,10 +209,6 @@ namespace {
// Minimum depth for use of singular extension
const Depth SingularExtensionDepth[2] = { 8 * ONE_PLY /* non-PV */, 6 * ONE_PLY /* PV */};
// If the TT move is at least SingularExtensionMargin better than the
// remaining ones we will extend it.
const Value SingularExtensionMargin = Value(0x20);
// Step 12. Futility pruning
// Futility margin for quiescence search
@@ -1055,7 +1051,7 @@ split_point_start: // At split points actual search starts from here
if (abs(ttValue) < VALUE_KNOWN_WIN)
{
Value b = ttValue - SingularExtensionMargin;
Value b = ttValue - depth;
ss->excludedMove = move;
ss->skipNullMove = true;
Value v = search<NonPV>(pos, ss, b - 1, b, depth / 2, ply);