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Simplify Null Move Search condition

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Removes depth condition, adjust parameters.

passed STC:
http://tests.stockfishchess.org/tests/view/5a008cbc0ebc590ccbb8a512
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 29282 W: 5317 L: 5210 D: 18755

passed LTC:
http://tests.stockfishchess.org/tests/view/5a00d8530ebc590ccbb8a541
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 26893 W: 3458 L: 3345 D: 20090

Bench: 5015773
This commit is contained in:
Joost VandeVondele
2017-11-08 13:44:24 +01:00
committed by Marco Costalba
parent 652199d840
commit 0a74c16ffe
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -686,7 +686,7 @@ namespace {
// Step 8. Null move search with verification search (is omitted in PV nodes) // Step 8. Null move search with verification search (is omitted in PV nodes)
if ( !PvNode if ( !PvNode
&& eval >= beta && eval >= beta
&& (ss->staticEval >= beta - 35 * (depth / ONE_PLY - 6) || depth >= 13 * ONE_PLY) && ss->staticEval >= beta - 36 * depth / ONE_PLY + 225
&& pos.non_pawn_material(pos.side_to_move())) && pos.non_pawn_material(pos.side_to_move()))
{ {