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Move draw checks right after doing the move

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2011-07-12 00:09:50 +03:00 • committed by Marco Costalba
parent 07e0dd27fb
commit 969ad8001c
1 changed files with 24 additions and 14 deletions
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38
src/search.cpp
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@ -726,7 +726,7 @@ namespace {
if (PvNode && thread.maxPly < ss->ply)
thread.maxPly = ss->ply;
// Step 1. Initialize node and poll. Polling can abort search
// Step 1. Initialize node.
if (!SpNode)
{
ss->currentMove = ss->bestMove = threatMove = (ss+1)->excludedMove = MOVE_NONE;
@ -742,18 +742,6 @@ namespace {
goto split_point_start;
}
if (pos.thread() == 0 && ++NodesSincePoll > NodesBetweenPolls)
{
NodesSincePoll = 0;
poll(pos);
}
// Step 2. Check for aborted search and immediate draw
if (( StopRequest
|| pos.is_draw<false>()
|| ss->ply > PLY_MAX) && !RootNode)
return VALUE_DRAW;
// Step 3. Mate distance pruning
if (!RootNode)
{
@ -914,7 +902,12 @@ namespace {
if (pos.pl_move_is_legal(move, ci.pinned))
{
pos.do_move(move, st, ci, pos.move_gives_check(move, ci));
value = -search<NonPV>(pos, ss+1, -rbeta, -rbeta+1, rdepth);
if (pos.is_draw<false>() || ss->ply + 1 > PLY_MAX)
value = VALUE_DRAW;
else
value = -search<NonPV>(pos, ss+1, -rbeta, -rbeta+1, rdepth);
pos.undo_move(move);
if (value >= rbeta)
return value;
@ -1104,6 +1097,22 @@ split_point_start: // At split points actual search starts from here
// Step 14. Make the move
pos.do_move(move, st, ci, givesCheck);
// Step XX. Poll. Check if search should be aborted.
if (pos.thread() == 0 && ++NodesSincePoll > NodesBetweenPolls)
{
NodesSincePoll = 0;
poll(pos);
}
// Step XX. Check for aborted search and immediate draw
if ( StopRequest
|| pos.is_draw<false>()
|| ss->ply + 1 > PLY_MAX)
{
value = VALUE_DRAW;
goto undo;
}
// Step extra. pv search (only in PV nodes)
// The first move in list is the expected PV
if (isPvMove)
@ -1150,6 +1159,7 @@ split_point_start: // At split points actual search starts from here
}
// Step 17. Undo move
undo:
pos.undo_move(move);
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);