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Fix fen/zobrist en-passant inconsistency

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This commit is contained in:
Sebastian Lague 2023-07-23 22:34:40 +02:00
parent 085baea286
commit 4cdfc57f04
1 changed files with 11 additions and 5 deletions
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16
Chess-Challenge/src/Framework/Chess/Helpers/FenUtility.cs
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@ -80,8 +80,12 @@ namespace ChessChallenge.Chess
return loadedPositionInfo;
}
// Get the fen string of the current position
public static string CurrentFen(Board board)
/// <summary>
/// Get the fen string of the current position
/// When alwaysIncludeEPSquare is true the en passant square will be included
/// in the fen string even if no enemy pawn is in a position to capture it.
/// </summary>
public static string CurrentFen(Board board, bool alwaysIncludeEPSquare = true)
{
string fen = "";
for (int rank = 7; rank >= 0; rank--)
@ -161,13 +165,15 @@ namespace ChessChallenge.Chess
int epFileIndex = board.currentGameState.enPassantFile - 1;
int epRankIndex = (board.IsWhiteToMove) ? 5 : 2;
if (epFileIndex == -1 || !EnPassantCanBeCaptured(epFileIndex, epRankIndex, board))
bool isEnPassant = epFileIndex != -1;
bool includeEP = alwaysIncludeEPSquare || EnPassantCanBeCaptured(epFileIndex, epRankIndex, board);
if (isEnPassant && includeEP)
{
fen += '-';
fen += BoardHelper.SquareNameFromCoordinate(epFileIndex, epRankIndex);
}
else
{
fen += BoardHelper.SquareNameFromCoordinate(epFileIndex, epRankIndex);
fen += '-';
}
// 50 move counter