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Check for easy move just once

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Here the rational seems to be that if after one try easy
move detection fails then the easy move is not so easy :-)

After 15563 games at 60+0.05
ELO: 3.04 +-5.5 (95%) LOS: 97.0%
Total: 15563 W: 2664 L: 2528 D: 10371

No functional change.
This commit is contained in:
Gary Linscott 2013-03-10 10:06:39 +01:00 • committed by Marco Costalba
parent 3698d9aa55
commit a24da071f0
1 changed files with 3 additions and 0 deletions
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3
src/search.cpp
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@ -293,6 +293,7 @@ namespace {
Stack ss[MAX_PLY_PLUS_2];
int depth, prevBestMoveChanges;
Value bestValue, alpha, beta, delta;
bool triedEasyMove = false;
memset(ss, 0, 4 * sizeof(Stack));
depth = BestMoveChanges = 0;
@ -439,10 +440,12 @@ namespace {
// Stop search early if one move seems to be much better than others
if ( depth >= 12
&& !stop
&& !triedEasyMove
&& PVSize == 1
&& ( RootMoves.size() == 1
|| Time::now() - SearchTime > (TimeMgr.available_time() * 20) / 100))
{
triedEasyMove = true;
Value rBeta = bestValue - 2 * PawnValueMg;
(ss+1)->excludedMove = RootMoves[0].pv[0];
(ss+1)->skipNullMove = true;