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Remove nmpColor

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no benefit seen, neither in game play nor for zugzwang test positions

STC: https://tests.stockfishchess.org/tests/view/642e293977ff3301150e9b55
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 161848 W: 43332 L: 43254 D: 75262
Ptnml(0-2): 418, 16987, 46058, 17021, 440

LTC: https://tests.stockfishchess.org/tests/view/642fea9420eb941419bde296
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 120208 W: 32529 L: 32418 D: 55261
Ptnml(0-2): 35, 11424, 37080, 11525, 40

closes https://github.com/official-stockfish/Stockfish/pull/4511

bench 3979409
This commit is contained in:
Dubslow 2023-04-05 20:30:01 -05:00 • committed by Joost VandeVondele
parent 4ad2713e19
commit f66c36277f
2 changed files with 2 additions and 4 deletions
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5
src/search.cpp
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@ -802,7 +802,7 @@ namespace {
&& ss->staticEval >= beta - 20 * depth - improvement / 13 + 253 + complexity / 25
&& !excludedMove
&& pos.non_pawn_material(us)
&& (ss->ply >= thisThread->nmpMinPly || us != thisThread->nmpColor))
&& (ss->ply >= thisThread->nmpMinPly))
{
assert(eval - beta >= 0);
@ -830,9 +830,8 @@ namespace {
assert(!thisThread->nmpMinPly); // Recursive verification is not allowed
// Do verification search at high depths, with null move pruning disabled
// for us, until ply exceeds nmpMinPly.
// until ply exceeds nmpMinPly.
thisThread->nmpMinPly = ss->ply + 3 * (depth-R) / 4;
thisThread->nmpColor = us;
Value v = search<NonPV>(pos, ss, beta-1, beta, depth-R, false);

1
src/thread.h
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@ -62,7 +62,6 @@ public:
size_t pvIdx, pvLast;
std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;
int selDepth, nmpMinPly;
Color nmpColor;
Value bestValue, optimism[COLOR_NB];
Position rootPos;