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Simplify away internal iterative deepening

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Remove the iterative deepening step.
Instead, employ a depth reduction if the position is not in TT and on the PV.

STC https://tests.stockfishchess.org/tests/view/5f3ce6eaa95672ddd56c637e
LLR: 2.97 (-2.94,2.94) {-0.50,1.50}
Total: 41096 W: 4421 L: 4257 D: 32418
Ptnml(0-2): 207, 3259, 13460, 3407, 215

LTC (old) https://tests.stockfishchess.org/tests/view/5f3d7d4fa95672ddd56c640b
LLR: 2.92 (-2.94,2.94) {-1.50,0.50}
Total: 26032 W: 1320 L: 1309 D: 23403
Ptnml(0-2): 22, 1152, 10654, 1169, 19

LTC (new) https://tests.stockfishchess.org/tests/view/5f3e31e0a95672ddd56c6464
LLR: 2.95 (-2.94,2.94) {-0.75,0.25}
Total: 34160 W: 1844 L: 1766 D: 30550
Ptnml(0-2): 33, 1533, 13876, 1599, 39

bench: 3849173
This commit is contained in:
Unai Corzo 2020-08-21 09:24:25 +02:00 • committed by Joost VandeVondele
parent 15abcaedc1
commit e64b957274
1 changed files with 5 additions and 9 deletions
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14
src/search.cpp
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@ -939,15 +939,11 @@ namespace {
} }
} }
// Step 11. Internal iterative deepening (~1 Elo) // Step 11. If the position is not in TT, decrease depth by 2
if (depth >= 7 && !ttMove) if ( PvNode
{ && depth >= 6
search<NT>(pos, ss, alpha, beta, depth - 7, cutNode); && !ttMove)
depth -= 2;
tte = TT.probe(posKey, ttHit);
ttValue = ttHit ? value_from_tt(tte->value(), ss->ply, pos.rule50_count()) : VALUE_NONE;
ttMove = ttHit ? tte->move() : MOVE_NONE;
}
moves_loop: // When in check, search starts from here moves_loop: // When in check, search starts from here