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Introduce separate counter-move tables for inCheck

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Enhance counter-move history table by adding a inCheck dimension. This doubles
the size of the table but provides more accurate move ordering.

STC: (yellow)
LLR: -2.94 (-2.94,2.94) [0.50,4.50]
Total: 36217 W: 7790 L: 7777 D: 20650
http://tests.stockfishchess.org/tests/view/5d9b9a290ebc5902b6d04fe0

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 36665 W: 6063 L: 5788 D: 24814
http://tests.stockfishchess.org/tests/view/5d9b9fcc0ebc5902b6d05985

Closes https://github.com/official-stockfish/Stockfish/pull/2353

Bench: 4053577
This commit is contained in:
VoyagerOne
2019-10-08 10:44:01 -04:00
committed by Stéphane Nicolet
parent 23a022980b
commit 80d59eea39
3 changed files with 14 additions and 12 deletions
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14
src/thread.cpp
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@@ -70,13 +70,15 @@ void Thread::clear() {
mainHistory.fill(0);
captureHistory.fill(0);
for (StatsType c : { NoCaptures, Captures })
for (auto& to : continuationHistory[c])
for (auto& h : to)
h->fill(0);
for (bool inCheck : { false, true })
for (StatsType c : { NoCaptures, Captures })
for (auto& to : continuationHistory[inCheck][c])
for (auto& h : to)
h->fill(0);
for (StatsType c : { NoCaptures, Captures })
continuationHistory[c][NO_PIECE][0]->fill(Search::CounterMovePruneThreshold - 1);
for (bool inCheck : { false, true })
for (StatsType c : { NoCaptures, Captures })
continuationHistory[inCheck][c][NO_PIECE][0]->fill(Search::CounterMovePruneThreshold - 1);
}
/// Thread::start_searching() wakes up the thread that will start the search