even though bench is unchanged to depth 28,
due to adjusting depth in singular extensions this might be functional.
STC: https://tests.stockfishchess.org/tests/view/
63ec21affe833123fef34153
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 195712 W: 51625 L: 51581 D: 92506
Ptnml(0-2): 504, 20527, 55779, 20513, 533
LTC: https://tests.stockfishchess.org/tests/view/
63ed3487fe833123fef375ed
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 32176 W: 8631 L: 8442 D: 15103
Ptnml(0-2): 5, 2794, 10309, 2967, 13
closes https://github.com/official-stockfish/Stockfish/pull/4395
Bench
4283297
Value delta = beta - alpha;
Value delta = beta - alpha;
+ Depth r = reduction(improving, depth, moveCount, delta, thisThread->rootDelta);
+
// Step 14. Pruning at shallow depth (~120 Elo). Depth conditions are important for mate finding.
if ( !rootNode
&& pos.non_pawn_material(us)
// Step 14. Pruning at shallow depth (~120 Elo). Depth conditions are important for mate finding.
if ( !rootNode
&& pos.non_pawn_material(us)
moveCountPruning = moveCount >= futility_move_count(improving, depth);
// Reduced depth of the next LMR search
moveCountPruning = moveCount >= futility_move_count(improving, depth);
// Reduced depth of the next LMR search
- int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount, delta, thisThread->rootDelta), 0);
+ int lmrDepth = std::max(newDepth - r, 0);
if ( capture
|| givesCheck)
if ( capture
|| givesCheck)
// Step 16. Make the move
pos.do_move(move, st, givesCheck);
// Step 16. Make the move
pos.do_move(move, st, givesCheck);
- Depth r = reduction(improving, depth, moveCount, delta, thisThread->rootDelta);
-
// Decrease reduction if position is or has been on the PV
// and node is not likely to fail low. (~3 Elo)
if ( ss->ttPv
// Decrease reduction if position is or has been on the PV
// and node is not likely to fail low. (~3 Elo)
if ( ss->ttPv