public static Move MoveFromUciNotation(string uciMoveNotation)
{
if (uciMoveNotation.Length < 4)
{
throw new ArgumentException($"Long algebraic notation expected. '{uciMoveNotation}' is too short!");
}
if (uciMoveNotation.Length > 5)
{
throw new ArgumentException($"Long algebraic notation expected. '{uciMoveNotation}' is too long!");
}
//expected format is the long algebraic notation without piece names
https: //en.wikipedia.org/wiki/Algebraic_notation_(chess)
//Examples: e2e4, e7e5, e1g1(white short castling), e7e8q(for promotion)
string fromSquare = uciMoveNotation.Substring(0, 2);
string toSquare = uciMoveNotation.Substring(2, 2);
int fromIndex = Notation.ToSquareIndex(fromSquare);
int toIndex = Notation.ToSquareIndex(toSquare);
int flags = 0;
//the presence of a 5th character should mean promotion
if (uciMoveNotation.Length == 5)
{
//promotion flags
char promotion = uciMoveNotation[4];
flags = promotion switch
{
'N' => Flag.PromoteToKnight,
'B' => Flag.PromoteToBishop,
'R' => Flag.PromoteToRook,
'Q' => Flag.PromoteToQueen,
'n' => Flag.PromoteToKnight,
'b' => Flag.PromoteToBishop,
'r' => Flag.PromoteToRook,
'q' => Flag.PromoteToQueen,
_ => throw new NotImplementedException()
};
}
return(new Move(fromIndex, toIndex, flags));
}