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Razor also on PV nodes

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Simplification introduced by xoto10

blue LTC vs new master:
https://tests.stockfishchess.org/tests/view/631ad4ef9cfa5e9b648d1b4e
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 59184 W: 16002 L: 15828 D: 27354
Ptnml(0-2): 65, 5777, 17747, 5925, 78

blue STC vs old master:
https://tests.stockfishchess.org/tests/view/6306b87b902a848543334c25
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 213944 W: 57184 L: 57159 D: 99601
Ptnml(0-2): 877, 23448, 58331, 23405, 911

blue LTC vs old master:
https://tests.stockfishchess.org/tests/view/63070e6b902a8485433357e7
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 192080 W: 52050 L: 52006 D: 88024
Ptnml(0-2): 232, 18981, 57611, 18943, 273

closes https://github.com/official-stockfish/Stockfish/pull/4147

bench 4208975
This commit is contained in:
Dubslow
2022-08-19 22:49:29 -05:00
committed by Joost VandeVondele
parent eaf2c8207f
commit 9fa258ee1d
1 changed files with 1 additions and 2 deletions
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src/search.cpp
+1 -2
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@@ -776,8 +776,7 @@ namespace {
// Step 7. Razoring. // Step 7. Razoring.
// If eval is really low check with qsearch if it can exceed alpha, if it can't, // If eval is really low check with qsearch if it can exceed alpha, if it can't,
// return a fail low. // return a fail low.
if ( !PvNode if ( depth <= 7
&& depth <= 7
&& eval < alpha - 369 - 254 * depth * depth) && eval < alpha - 369 - 254 * depth * depth)
{ {
value = qsearch<NonPV>(pos, ss, alpha - 1, alpha); value = qsearch<NonPV>(pos, ss, alpha - 1, alpha);