/// <summary>
/// Constructor from a set of EncodedPositionBoards.
/// </summary>
/// <param name="boardHistory"></param>
/// <param name="miscInfo"></param>
private EncodedPositionWithHistory(EncodedPositionBoards boardHistory, EncodedTrainingPositionMiscInfo miscInfo)
{
BoardsHistory = boardHistory;
MiscInfo = miscInfo;
// if (Marshal.SizeOf<LZBoard>() != LZBoardSizeInBytes) throw new Exception("Internal error, incorrect board size");
}
/// <summary>
/// Returns the FEN string correpsonding to the position at specified history board.
/// </summary>
/// <param name="historyIndex"></param>
/// <returns></returns>
public string FENForHistoryBoard(int historyIndex)
{
EncodedPositionBoard planes = GetPlanesForHistoryBoard(historyIndex);
// KQkq - 0 1
bool weAreWhite = MiscInfo.InfoPosition.SideToMove == 0;
string fen = MiscInfo.InfoPosition.SideToMove == 0 ? planes.GetFEN(weAreWhite) : planes.Reversed.GetFEN(weAreWhite);
if (historyIndex != 0)
{
return(fen);
}
fen = fen + (weAreWhite ? " w" : " b");
fen = fen + " ";
string castling = "";
if ((weAreWhite ? MiscInfo.InfoPosition.Castling_US_OO : MiscInfo.InfoPosition.Castling_Them_OO) > 0)
{
castling += "K";
}
if ((weAreWhite ? MiscInfo.InfoPosition.Castling_US_OOO : MiscInfo.InfoPosition.Castling_Them_OOO) > 0)
{
castling += "Q";
}
if ((weAreWhite ? MiscInfo.InfoPosition.Castling_Them_OO : MiscInfo.InfoPosition.Castling_US_OO) > 0)
{
castling += "k";
}
if ((weAreWhite ? MiscInfo.InfoPosition.Castling_Them_OOO : MiscInfo.InfoPosition.Castling_US_OOO) > 0)
{
castling += "q";
}
if (castling == "")
{
castling = "-";
}
PositionMiscInfo.EnPassantFileIndexEnum enPassant = PositionMiscInfo.EnPassantFileIndexEnum.FileNone;
if (historyIndex < 7)
{
EncodedPositionBoard planesPriorBoard = GetPlanesForHistoryBoard(historyIndex + 1);
enPassant = EncodedPositionBoards.EnPassantOpportunityBetweenBoards(planes, planesPriorBoard);
}
string epTarget = "-";
if (enPassant != PositionMiscInfo.EnPassantFileIndexEnum.FileNone)
{
epTarget = PositionMiscInfo.EPFileChars[(int)enPassant] + (weAreWhite ? "6" : "3");
}
fen = fen + castling + " " + epTarget + " " + MiscInfo.InfoPosition.Rule50Count + " " + (1 + MiscInfo.InfoPosition.MoveCount); // Sometimes 2 dashes?
return(fen);
}
