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Do not change TB cursed wins to draws if requested

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If Syzygy50MoveRule is false, do not calls to is_draw() need to be guarded.
Also fixes a TB rootmove ranking issue in this case.

closes https://github.com/official-stockfish/Stockfish/pull/5814

No functional change
This commit is contained in:
Robert Nurnberg @ elitebook
2025-01-25 20:42:50 +01:00
committed by Joost VandeVondele
parent 75b75bc16a
commit 6c7c5c7e47
4 changed files with 10 additions and 7 deletions
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src/position.cpp
+4 -3
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@@ -1187,11 +1187,12 @@ bool Position::is_draw(int ply) const {
if (st->rule50 > 99 && (!checkers() || MoveList<LEGAL>(*this).size()))
return true;
// Return a draw score if a position repeats once earlier but strictly
// after the root, or repeats twice before or at the root.
return st->repetition && st->repetition < ply;
return is_repetition(ply);
}
// Return a draw score if a position repeats once earlier but strictly
// after the root, or repeats twice before or at the root.
bool Position::is_repetition(int ply) const { return st->repetition && st->repetition < ply; }
// Tests whether there has been at least one repetition
// of positions since the last capture or pawn move.