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Third attempt: hopefully the last one

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This commit is contained in:
Marco Costalba 2016-05-23 08:49:22 +02:00
parent de5a03ff0f
commit 36d6a1fd0a
1 changed files with 11 additions and 4 deletions
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15
src/syzygy/tbprobe.cpp
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@ -1499,21 +1499,28 @@ int Tablebases::probe_dtz(Position& pos, ProbeState* result)
for (const Move& move : MoveList<LEGAL>(pos))
{
bool isZeroingMove = pos.capture(move) || type_of(pos.moved_piece(move)) == PAWN;
bool zeroing = pos.capture(move) || type_of(pos.moved_piece(move)) == PAWN;
pos.do_move(move, st, pos.gives_check(move, ci));
dtz = isZeroingMove ? -zeroing_move_dtz(wdl) : -probe_dtz(pos, result);
// For zeroing moves we want the dtz of the move _before_ doing it,
// otherwise we will get the dtz of the next move sequence. Search the
// position after the move to get the score sign (because even in a
// winning position we could make a losing capture or going for a draw).
dtz = zeroing ? -zeroing_move_dtz(search(pos, WDLLoss, WDLWin, result))
: -probe_dtz(pos, result);
pos.undo_move(move);
if (*result == FAIL)
return 0;
// Skip the draws and ensure that if we are winning we pick only positive dtz
// Skip the draws and if we are winning only pick positive dtz
if (dtz < minDTZ && sign_of(dtz) == sign_of(wdl))
minDTZ = dtz;
}
return minDTZ > 0 ? minDTZ + 1 : minDTZ - 1; // Convert result from 1-ply search
return minDTZ + sign_of(minDTZ); // Convert result from 1-ply search
}
// Check whether there has been at least one repetition of positions