// search to overwrite a previous full search TT value, so we use a different
// position key in case of an excluded move.
excludedMove = ss->excludedMove;
- posKey = excludedMove ? pos.exclusion_key() : pos.key();
+ posKey = pos.key() ^ Key(excludedMove);
tte = TT.probe(posKey, ttHit);
ttValue = ttHit ? value_from_tt(tte->value(), ss->ply) : VALUE_NONE;
ttMove = rootNode ? thisThread->rootMoves[thisThread->PVIdx].pv[0]
}
// Extra penalty for a quiet TT move in previous ply when it gets refuted
- if ((ss-1)->moveCount == 1 && !pos.captured_piece_type())
+ if ((ss-1)->moveCount == 1 && !pos.captured_piece())
{
Value penalty = Value(d * d + 4 * d + 1);
Square prevSq = to_sq((ss-1)->currentMove);
// Step 6. Razoring (skipped when in check)
if ( !PvNode
&& depth < 4 * ONE_PLY
- && eval + razor_margin[depth / ONE_PLY] <= alpha
- && ttMove == MOVE_NONE)
+ && ttMove == MOVE_NONE
+ && eval + razor_margin[depth / ONE_PLY] <= alpha)
{
if ( depth <= ONE_PLY
&& eval + razor_margin[3 * ONE_PLY] <= alpha)
newDepth = depth - ONE_PLY + extension;
// Step 13. Pruning at shallow depth
- if ( !rootNode
- && !captureOrPromotion
- && !inCheck
- && !givesCheck
- && !pos.advanced_pawn_push(move)
- && bestValue > VALUE_MATED_IN_MAX_PLY)
+ if ( !rootNode
+ && !inCheck
+ && bestValue > VALUE_MATED_IN_MAX_PLY)
{
- // Move count based pruning
- if (moveCountPruning)
- continue;
+ if ( !captureOrPromotion
+ && !givesCheck
+ && !pos.advanced_pawn_push(move))
+ {
+ // Move count based pruning
+ if (moveCountPruning)
+ continue;
- predictedDepth = std::max(newDepth - reduction<PvNode>(improving, depth, moveCount), DEPTH_ZERO);
+ predictedDepth = std::max(newDepth - reduction<PvNode>(improving, depth, moveCount), DEPTH_ZERO);
- // Countermoves based pruning
- if ( predictedDepth < 3 * ONE_PLY
- && (!cmh || (*cmh )[moved_piece][to_sq(move)] < VALUE_ZERO)
- && (!fmh || (*fmh )[moved_piece][to_sq(move)] < VALUE_ZERO)
- && (!fmh2 || (*fmh2)[moved_piece][to_sq(move)] < VALUE_ZERO || (cmh && fmh)))
- continue;
+ // Countermoves based pruning
+ if ( predictedDepth < 3 * ONE_PLY
+ && (!cmh || (*cmh )[moved_piece][to_sq(move)] < VALUE_ZERO)
+ && (!fmh || (*fmh )[moved_piece][to_sq(move)] < VALUE_ZERO)
+ && (!fmh2 || (*fmh2)[moved_piece][to_sq(move)] < VALUE_ZERO || (cmh && fmh)))
+ continue;
- // Futility pruning: parent node
- if ( predictedDepth < 7 * ONE_PLY
- && ss->staticEval + 256 + 200 * predictedDepth / ONE_PLY <= alpha)
- continue;
+ // Futility pruning: parent node
+ if ( predictedDepth < 7 * ONE_PLY
+ && ss->staticEval + 256 + 200 * predictedDepth / ONE_PLY <= alpha)
+ continue;
- // Prune moves with negative SEE at low depths and below a decreasing
- // threshold at higher depths.
- if (predictedDepth < 8 * ONE_PLY)
- {
- Value see_v = predictedDepth < 4 * ONE_PLY ? VALUE_ZERO
- : -PawnValueMg * 2 * int(predictedDepth - 3 * ONE_PLY) / ONE_PLY;
+ // Prune moves with negative SEE at low depths and below a decreasing
+ // threshold at higher depths.
+ if (predictedDepth < 8 * ONE_PLY)
+ {
+ Value see_v = predictedDepth < 4 * ONE_PLY ? VALUE_ZERO
+ : -PawnValueMg * 2 * int(predictedDepth - 3 * ONE_PLY) / ONE_PLY;
- if (pos.see_sign(move) < see_v)
- continue;
+ if (pos.see_sign(move) < see_v)
+ continue;
+ }
}
+ else if ( depth < 3 * ONE_PLY
+ && ( mp.see_sign() < 0
+ || (!mp.see_sign() && pos.see_sign(move) < VALUE_ZERO)))
+ continue;
}
// Speculative prefetch as early as possible
}
// Extra penalty for a quiet TT move in previous ply when it gets refuted
- if ((ss-1)->moveCount == 1 && !pos.captured_piece_type())
+ if ((ss-1)->moveCount == 1 && !pos.captured_piece())
{
Value penalty = Value(d * d + 4 * d + 1);
Square prevSq = to_sq((ss-1)->currentMove);
}
// Bonus for prior countermove that caused the fail low
else if ( depth >= 3 * ONE_PLY
- && !pos.captured_piece_type()
+ && !pos.captured_piece()
&& is_ok((ss-1)->currentMove))
{
int d = depth / ONE_PLY;
RootInTB = root_probe_wdl(pos, rootMoves, TB::Score);
// Only probe during search if winning
- if (TB::Score <= VALUE_DRAW)
+ if (RootInTB && TB::Score <= VALUE_DRAW)
Cardinality = 0;
}