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Move the draw check also for qsearch

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2011-07-12 02:00:30 +03:00 • committed by Marco Costalba
parent 969ad8001c
commit 4ad6a3496b
1 changed files with 6 additions and 5 deletions
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11
src/search.cpp
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@ -1322,10 +1322,6 @@ undo:
ss->bestMove = ss->currentMove = MOVE_NONE; ss->bestMove = ss->currentMove = MOVE_NONE;
ss->ply = (ss-1)->ply + 1; ss->ply = (ss-1)->ply + 1;
// Check for an instant draw or maximum ply reached
if (pos.is_draw<true>() || ss->ply > PLY_MAX)
return VALUE_DRAW;
// Decide whether or not to include checks, this fixes also the type of // Decide whether or not to include checks, this fixes also the type of
// TT entry depth that we are going to use. Note that in qsearch we use // TT entry depth that we are going to use. Note that in qsearch we use
// only two types of depth in TT: DEPTH_QS_CHECKS or DEPTH_QS_NO_CHECKS. // only two types of depth in TT: DEPTH_QS_CHECKS or DEPTH_QS_NO_CHECKS.
@ -1460,7 +1456,12 @@ undo:
// Make and search the move // Make and search the move
pos.do_move(move, st, ci, givesCheck); pos.do_move(move, st, ci, givesCheck);
value = -qsearch<NT>(pos, ss+1, -beta, -alpha, depth-ONE_PLY);
if (pos.is_draw<true>() || ss->ply+1 > PLY_MAX)
value = VALUE_DRAW;
else
value = -qsearch<NT>(pos, ss+1, -beta, -alpha, depth-ONE_PLY);
pos.undo_move(move); pos.undo_move(move);
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE); assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);