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Shuffle detection #2108

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Bench: 3402947
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MJZ1977 2019-04-10 12:56:05 +02:00 • committed by Marco Costalba
parent 6373fd56e9
commit e89bc30fdc
1 changed files with 17 additions and 0 deletions
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17
src/search.cpp
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@ -606,6 +606,15 @@ namespace {
: ttHit ? tte->move() : MOVE_NONE;
ttPv = (ttHit && tte->is_pv()) || (PvNode && depth > 4 * ONE_PLY);
// If position has been searched at higher depths and we are shuffling,
// return value_draw.
if ( pos.rule50_count() > 36 - 6 * (pos.count<ALL_PIECES>() > 14)
&& ss->ply > 36 - 6 * (pos.count<ALL_PIECES>() > 14)
&& ttHit
&& tte->depth() > depth
&& pos.count<PAWN>() > 0)
return VALUE_DRAW;
// At non-PV nodes we check for an early TT cutoff
if ( !PvNode
&& ttHit
@ -927,6 +936,14 @@ moves_loop: // When in check, search starts from here
else if (type_of(move) == CASTLING)
extension = ONE_PLY;
// Shuffle extension
else if ( PvNode
&& pos.rule50_count() > 18
&& ss->ply > 18
&& depth < 3 * ONE_PLY
&& ss->ply < 3 * thisThread->rootDepth / ONE_PLY) // To avoid infinite loops
extension = ONE_PLY;
// Passed pawn extension
else if ( move == ss->killers[0]
&& pos.advanced_pawn_push(move)