// get the move type using the before and after piece types
private static PieceMoveType MoveTypeFromPieceTypes(PieceMoveType before, PieceMoveType after)
{
// argument guard
if (before < PieceMoveType.Pawn || before > PieceMoveType.King || after < PieceMoveType.Pawn || after > PieceMoveType.King)
{
return(PieceMoveType.Undefined);
}
if (before == after) // standard or castling move
{
return(before);
}
else if (before == PieceMoveType.Pawn) // pawn promo
{
switch (after)
{
case PieceMoveType.Queen:
return(PieceMoveType.PawnQueen);
case PieceMoveType.Rook:
return(PieceMoveType.PawnRook);
case PieceMoveType.Bishop:
return(PieceMoveType.PawnBishop);
case PieceMoveType.Knight:
return(PieceMoveType.PawnKnight);
default:
return(PieceMoveType.Undefined);
}
}
return(PieceMoveType.Undefined);
}
public Move(ulong f, ulong t, PieceMoveType m)
{
From = new BoardAddress(f);
To = new BoardAddress(t);
MoveType = m;
}
// create a move from ACN string and the piece positions
public Move(string acn, PiecePositions pieces)
{
int Len = acn.Length;
if (Len < 4 || Len > 5)
{
throw new ArgumentException(string.Format("ACN strings must be 4 or 5 characters long: \"{0}\"", acn));
}
string f = acn.Substring(0, 2);
string t = acn.Substring(2, 2);
From = new BoardAddress(f);
To = new BoardAddress(t);
// determine the type of piece that is moving
if ((pieces.Pawns & From.Position) != 0)
{
MoveType = PieceMoveType.Pawn;
}
else if ((pieces.Knights & From.Position) != 0)
{
MoveType = PieceMoveType.Knight;
}
else if ((pieces.Bishops & From.Position) != 0)
{
MoveType = PieceMoveType.Bishop;
}
else if ((pieces.Rooks & From.Position) != 0)
{
MoveType = PieceMoveType.Rook;
}
else if ((pieces.Queens & From.Position) != 0)
{
MoveType = PieceMoveType.Queen;
}
else if ((pieces.Kings & From.Position) != 0)
{
MoveType = PieceMoveType.King;
}
else
{
throw new ArgumentException(string.Format("move \"{0}\" invalid given current piece positions", acn));
}
// promotion on this move?
if (Len == 5) // yes
{
if (MoveType != PieceMoveType.Pawn)
{
throw new ArgumentException("tried to promote from a piece type other than pawn");
}
char promo = char.ToLower(acn[4]);
switch (promo)
{
case 'n':
MoveType = PieceMoveType.PawnKnight;
break;
case 'b':
MoveType = PieceMoveType.PawnBishop;
break;
case 'r':
MoveType = PieceMoveType.PawnRook;
break;
case 'q':
MoveType = PieceMoveType.PawnQueen;
break;
default:
throw new ArgumentException(string.Format("ACN string contains invalid promotion character \"{0}\"", promo));
}
}
}
public Move(BoardAddress f, BoardAddress t, PieceMoveType m)
{
From = f;
To = t;
MoveType = m;
}