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Merge pull request #3498 from Sopel97/old_fix_again

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Add additional checks for en-passant possiblity when fixing the erroneus ep flag from a fen.
This commit is contained in:
Joost VandeVondele
2021-05-25 14:09:52 +02:00
committed by GitHub
parent ed8b381cce 55ce07b773
commit 774c0caf12
1 changed files with 20 additions and 0 deletions
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src/extra/nnue_data_binpack_format.h
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@@ -6116,6 +6116,26 @@ namespace chess
[[nodiscard]] inline bool Position::isEpPossibleColdPath(Square epSquare, Bitboard pawnsAttackingEpSquare, Color sideToMove) const
{
if (pieceAt(epSquare) != Piece::none())
{
return false;
}
const auto forward =
sideToMove == chess::Color::White
? FlatSquareOffset(0, 1)
: FlatSquareOffset(0, -1);
if (pieceAt(epSquare + forward) != Piece::none())
{
return false;
}
if (pieceAt(epSquare + -forward) != Piece(PieceType::Pawn, !sideToMove))
{
return false;
}
// only set m_epSquare when it matters, ie. when
// the opposite side can actually capture
for (Square sq : pawnsAttackingEpSquare)