<< " currmovenumber " << i + 1 << std::endl;
// Decide search depth for this move
+ bool moveIsCapture = pos.move_is_capture(move);
bool dangerous;
ext = extension(pos, move, true, pos.move_is_capture(move), pos.move_is_check(move), false, false, &dangerous);
newDepth = (Iteration - 2) * OnePly + ext + InitialDepth;
}
else
{
- value = -search(pos, ss, -alpha, newDepth, 1, true, 0);
- if (value > alpha)
+ if (newDepth >= 3*OnePly
+ && i + MultiPV >= LMRPVMoves
+ && !dangerous
+ && !moveIsCapture
+ && !move_is_promotion(move)
+ && !move_is_castle(move))
{
- // Fail high! Set the boolean variable FailHigh to true, and
- // re-search the move with a big window. The variable FailHigh is
- // used for time managment: We try to avoid aborting the search
- // prematurely during a fail high research.
- FailHigh = true;
- value = -search_pv(pos, ss, -beta, -alpha, newDepth, 1, 0);
+ ss[0].reduction = OnePly;
+ value = -search(pos, ss, -alpha, newDepth-OnePly, 1, true, 0);
+ }
+ else
+ value = alpha + 1; // Just to trigger next condition
+ if(value > alpha)
+ {
+ value = -search(pos, ss, -alpha, newDepth, 1, true, 0);
+ if (value > alpha)
+ {
+ // Fail high! Set the boolean variable FailHigh to true, and
+ // re-search the move with a big window. The variable FailHigh is
+ // used for time managment: We try to avoid aborting the search
+ // prematurely during a fail high research.
+ FailHigh = true;
+ value = -search_pv(pos, ss, -beta, -alpha, newDepth, 1, 0);
+ }
}
}
{
// Try to reduce non-pv search depth by one ply if move seems not problematic,
// if the move fails high will be re-searched at full depth.
- if ( depth >= 2*OnePly
+ if ( depth >= 3*OnePly
&& moveCount >= LMRPVMoves
&& !dangerous
&& !moveIsCapture
pos.undo_null_move();
- if (value_is_mate(nullValue))
- {
- /* Do not return unproven mates */
- }
- else if (nullValue >= beta)
+ if (nullValue >= beta)
{
if (depth < 6 * OnePly)
return beta;
// Try to reduce non-pv search depth by one ply if move seems not problematic,
// if the move fails high will be re-searched at full depth.
- if ( depth >= 2*OnePly
+ if ( depth >= 3*OnePly
&& moveCount >= LMRNonPVMoves
&& !dangerous
&& !moveIsCapture
assert(m != MOVE_NONE);
Depth result = Depth(0);
- *dangerous = check || singleReply || mateThreat;
+ *dangerous = check | singleReply | mateThreat;
- if (check)
- result += CheckExtension[pvNode];
+ if (*dangerous)
+ {
+ if (check)
+ result += CheckExtension[pvNode];
- if (singleReply)
- result += SingleReplyExtension[pvNode];
+ if (singleReply)
+ result += SingleReplyExtension[pvNode];
- if (mateThreat)
- result += MateThreatExtension[pvNode];
+ if (mateThreat)
+ result += MateThreatExtension[pvNode];
+ }
if (pos.type_of_piece_on(move_from(m)) == PAWN)
{