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Fix moveCount after legality check delay

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We really want PV moves and also Split Point moves to be
legal to avoid messing the move counter and corresonding
PV move detection or shared Split Point's counter variable.

This fixes a real bug where a position with only one move
allowed returns bestValue == -VALUE_INFINITE if the move
turns out to be illegal.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-05-28 10:35:52 +01:00
parent 4c3a000211
commit 853e2a9495
1 changed files with 13 additions and 6 deletions
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19
src/search.cpp
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@ -904,13 +904,18 @@ split_point_start: // At split points actual search starts from here
{
assert(move_is_ok(move));
if (move == excludedMove)
continue;
// At PV and SpNode nodes we want the moves to be legal
if ((PvNode || SpNode) && !pos.pl_move_is_legal(move, pinned))
continue;
if (SpNode)
{
moveCount = ++sp->moveCount;
lock_release(&(sp->lock));
}
else if (move == excludedMove)
continue;
else
moveCount++;
@ -1026,7 +1031,10 @@ split_point_start: // At split points actual search starts from here
// Check for legality only before to do the move
if (!pos.pl_move_is_legal(move, pinned))
{
moveCount--;
continue;
}
ss->currentMove = move;
@ -1370,7 +1378,8 @@ split_point_start: // At split points actual search starts from here
}
// Detect non-capture evasions that are candidate to be pruned
evasionPrunable = inCheck
evasionPrunable = !PvNode
&& inCheck
&& bestValue > VALUE_MATED_IN_PLY_MAX
&& !pos.move_is_capture(move)
&& !pos.can_castle(pos.side_to_move());
@ -1995,12 +2004,10 @@ split_point_start: // At split points actual search starts from here
pos.do_move(pv[0], *st++);
Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
while ( (tte = TT.probe(pos.get_key())) != NULL
&& tte->move() != MOVE_NONE
&& pos.move_is_pl(tte->move())
&& pos.pl_move_is_legal(tte->move(), pinned)
&& pos.pl_move_is_legal(tte->move(), pos.pinned_pieces(pos.side_to_move()))
&& ply < PLY_MAX
&& (!pos.is_draw() || ply < 2))
{