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Create useNullMove local variable

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2009-08-24 17:46:03 +03:00 • committed by Marco Costalba
parent 595a90dfd0
commit 268c53ac51
1 changed files with 15 additions and 12 deletions
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27
src/search.cpp
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@ -1281,13 +1281,15 @@ namespace {
bool mateThreat = false; bool mateThreat = false;
bool isCheck = pos.is_check(); bool isCheck = pos.is_check();
bool useNullMove = ( allowNullmove
&& depth > OnePly
&& !isCheck
&& !value_is_mate(beta)
&& ok_to_do_nullmove(pos)
&& approximateEval >= beta - NullMoveMargin);
// Null move search // Null move search
if ( allowNullmove if (useNullMove)
&& depth > OnePly
&& !isCheck
&& !value_is_mate(beta)
&& ok_to_do_nullmove(pos)
&& approximateEval >= beta - NullMoveMargin)
{ {
ss[ply].currentMove = MOVE_NULL; ss[ply].currentMove = MOVE_NULL;
@ -1326,12 +1328,13 @@ namespace {
} }
} }
// Null move search not allowed, try razoring // Null move search not allowed, try razoring
else if ( !value_is_mate(beta) if ( !useNullMove
&& depth < RazorDepth && !value_is_mate(beta)
&& approximateEval < beta - RazorApprMargins[int(depth) - 2] && depth < RazorDepth
&& ss[ply - 1].currentMove != MOVE_NULL && approximateEval < beta - RazorApprMargins[int(depth) - 2]
&& ttMove == MOVE_NONE && ss[ply - 1].currentMove != MOVE_NULL
&& !pos.has_pawn_on_7th(pos.side_to_move())) && ttMove == MOVE_NONE
&& !pos.has_pawn_on_7th(pos.side_to_move()))
{ {
Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID); Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID);
if (v < beta - RazorMargins[int(depth) - 2]) if (v < beta - RazorMargins[int(depth) - 2])