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Remove maxNextDepth

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This patch allows full PV search to have double extensions as well when
extension == 1 && doDeeperSearch && doEvenDeeperSearch && !doShallowerSearch
is true, which is extremely rare to occur.

Passed non-regression STC (master 3d2381d):
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 370824 W: 97835 L: 97974 D: 175015
Ptnml(0-2): 1073, 38814, 105731, 38767, 1027
https://tests.stockfishchess.org/tests/view/63c89416a83c702aac08314c

Passed non-regression LTC (master 3d2381d):
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 306048 W: 81173 L: 81237 D: 143638
Ptnml(0-2): 117, 27977, 96901, 27911, 118
https://tests.stockfishchess.org/tests/view/63cc4e84344bb01c191b2658

Bench: 4208265
This commit is contained in:
MinetaS 2023-01-19 09:49:42 +09:00 • committed by Joost VandeVondele
parent d4d1cec296
commit e4e61cd9cc
1 changed files with 1 additions and 3 deletions
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4
src/search.cpp
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@ -522,7 +522,6 @@ namespace {
constexpr bool PvNode = nodeType != NonPV;
constexpr bool rootNode = nodeType == Root;
const Depth maxNextDepth = rootNode ? depth : depth + 1;
// Check if we have an upcoming move which draws by repetition, or
// if the opponent had an alternative move earlier to this position.
@ -1235,8 +1234,7 @@ moves_loop: // When in check, search starts here
(ss+1)->pv = pv;
(ss+1)->pv[0] = MOVE_NONE;
value = -search<PV>(pos, ss+1, -beta, -alpha,
std::min(maxNextDepth, newDepth), false);
value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, false);
}
// Step 19. Undo move