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Simplify ttHitAverage away

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Simplify ttHitAverage away, which was introduced in the following commit:
[here](fe124896b2)

A few tweaks with Elo gaining bounds have been tried to keep the code,
but they all failed:
https://tests.stockfishchess.org/tests/view/61656f7683dd501a05b0b292
https://tests.stockfishchess.org/tests/view/6165c0ca83dd501a05b0b2ca
https://tests.stockfishchess.org/tests/view/6165bf9683dd501a05b0b2c8
https://tests.stockfishchess.org/tests/view/6165719483dd501a05b0b29b
https://tests.stockfishchess.org/tests/view/6166c7fd83dd501a05b0b353
https://tests.stockfishchess.org/tests/view/6166c63b83dd501a05b0b350

STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 58504 W: 14781 L: 14694 D: 29029
Ptnml(0-2): 175, 6718, 15426, 6711, 222
https://tests.stockfishchess.org/tests/view/6165112c83dd501a05b0b257

LTC:
LLR: 2.96 (-2.94,2.94) <-2.50,0.50>
Total: 33480 W: 8448 L: 8332 D: 16700
Ptnml(0-2): 21, 3569, 9447, 3679, 24
https://tests.stockfishchess.org/tests/view/61656fcf83dd501a05b0b294

change https://github.com/official-stockfish/Stockfish/pull/3739

bench: 4540339
This commit is contained in:
bmc4 2021-10-14 00:44:46 -03:00 • committed by Stéphane Nicolet
parent 673841301b
commit 0bddd942b4
2 changed files with 0 additions and 9 deletions
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8
src/search.cpp
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@ -332,7 +332,6 @@ void Thread::search() {
multiPV = std::min(multiPV, rootMoves.size());
ttHitAverage.set(50, 100); // initialize the running average at 50%
doubleExtensionAverage[WHITE].set(0, 100); // initialize the running average at 0%
doubleExtensionAverage[BLACK].set(0, 100); // initialize the running average at 0%
@ -670,9 +669,6 @@ namespace {
&& is_ok((ss-1)->currentMove))
thisThread->lowPlyHistory[ss->ply - 1][from_to((ss-1)->currentMove)] << stat_bonus(depth - 5);
// running average of ttHit
thisThread->ttHitAverage.update(ss->ttHit);
// At non-PV nodes we check for an early TT cutoff
if ( !PvNode
&& ss->ttHit
@ -1182,10 +1178,6 @@ moves_loop: // When in check, search starts here
&& bestMoveCount <= 3)
r--;
// Decrease reduction if the ttHit running average is large (~0 Elo)
if (thisThread->ttHitAverage.is_greater(537, 1024))
r--;
// Decrease reduction if position is or has been on the PV
// and node is not likely to fail low. (~3 Elo)
if ( ss->ttPv

1
src/thread.h
View file

@ -60,7 +60,6 @@ public:
Pawns::Table pawnsTable;
Material::Table materialTable;
size_t pvIdx, pvLast;
RunningAverage ttHitAverage;
RunningAverage doubleExtensionAverage[COLOR_NB];
uint64_t nodesLastExplosive;
uint64_t nodesLastNormal;