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Simplify improving condition

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if we were in check at our previous move we look back until we weren't
in check and take the staticEval of that position as reference.

Passed STC:
https://tests.stockfishchess.org/tests/view/668ba7b65034141ae5996665
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 74784 W: 19454 L: 19274 D: 36056
Ptnml(0-2): 260, 8874, 18952, 9038, 268

Passted LTC:
https://tests.stockfishchess.org/tests/view/668cb2db5034141ae599678b
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 241488 W: 61166 L: 61171 D: 119151
Ptnml(0-2): 190, 27154, 66062, 27147, 191

closes https://github.com/official-stockfish/Stockfish/pull/5492

bench: 1368313
This commit is contained in:
Guenther Demetz 2024-07-18 09:38:17 +02:00 • committed by Joost VandeVondele
parent e443b2459e
commit c755bc1a73
1 changed files with 3 additions and 6 deletions
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9
src/search.cpp
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@ -713,7 +713,7 @@ Value Search::Worker::search(
if (ss->inCheck)
{
// Skip early pruning when in check
ss->staticEval = eval = VALUE_NONE;
ss->staticEval = eval = (ss - 2)->staticEval;
improving = false;
goto moves_loop;
}
@ -764,12 +764,9 @@ Value Search::Worker::search(
// Set up the improving flag, which is true if current static evaluation is
// bigger than the previous static evaluation at our turn (if we were in
// check at our previous move we look at static evaluation at move prior to it
// and if we were in check at move prior to it flag is set to true) and is
// check at our previous move we go back until we weren't in check) and is
// false otherwise. The improving flag is used in various pruning heuristics.
improving = (ss - 2)->staticEval != VALUE_NONE
? ss->staticEval > (ss - 2)->staticEval
: (ss - 4)->staticEval != VALUE_NONE && ss->staticEval > (ss - 4)->staticEval;
improving = ss->staticEval > (ss - 2)->staticEval;
opponentWorsening = ss->staticEval + (ss - 1)->staticEval > 2;