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Refine improving-logic

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Don't rely on the assumption that we are improving after surviving a
check. Instead, compare with the static eval of 2 moves before.

STC
https://tests.stockfishchess.org/tests/view/5dedfd7f3cff9a249bb9e44d
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 38859 W: 8621 L: 8397 D: 21841

LTC
https://tests.stockfishchess.org/tests/view/5dee1b5a3cff9a249bb9e465
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 51130 W: 8308 L: 7996 D: 34826

Bench: 5371271
This commit is contained in:
Guenther Demetz
2019-12-10 08:07:34 +01:00
parent 443787b0d1
commit b6482472a0
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@@ -812,8 +812,8 @@ namespace {
&& eval <= alpha - RazorMargin) && eval <= alpha - RazorMargin)
return qsearch<NT>(pos, ss, alpha, beta); return qsearch<NT>(pos, ss, alpha, beta);
improving = ss->staticEval >= (ss-2)->staticEval improving = (ss-2)->staticEval == VALUE_NONE ? (ss->staticEval >= (ss-4)->staticEval
|| (ss-2)->staticEval == VALUE_NONE; || (ss-4)->staticEval == VALUE_NONE) : ss->staticEval >= (ss-2)->staticEval;
// Step 8. Futility pruning: child node (~30 Elo) // Step 8. Futility pruning: child node (~30 Elo)
if ( !PvNode if ( !PvNode