This removes a check that prevents null pruning at depth 1 PLY.
STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 23445 W: 4638 L: 4521 D: 14286
LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 61416 W: 8627 L: 8563 D: 44226
bench:
8145304
// Step 8. Null move search with verification search (is omitted in PV nodes)
if ( !PvNode
// Step 8. Null move search with verification search (is omitted in PV nodes)
if ( !PvNode
- && depth >= 2 * ONE_PLY
&& eval >= beta
&& (ss->staticEval >= beta - 35 * (depth / ONE_PLY - 6) || depth >= 13 * ONE_PLY)
&& pos.non_pawn_material(pos.side_to_move()))
&& eval >= beta
&& (ss->staticEval >= beta - 35 * (depth / ONE_PLY - 6) || depth >= 13 * ONE_PLY)
&& pos.non_pawn_material(pos.side_to_move()))