public override List <Move> GenerateMoves(Board board)
{
var moves = new List <Move>();
Move move;
if (Color == Color.White)
{
var upSquare = From.To(Coordinate.Directions.North);
if (upSquare.IsEmpty(board) && From.Rank != 7)//Pawn can go up if it is empty square
{
move = new Ordinary(board, this, upSquare);
moves.Add(move);
var twoUpSquare = upSquare.To(Coordinate.Directions.North);
if (From.Rank == 2 && twoUpSquare.IsEmpty(board))//Check can jump 2 square when it is on rank 2
{
move = new Ordinary(board, this, twoUpSquare);
moves.Add(move);
}
}
if (From.Rank != 7)
{
Coordinate crossSquare = From.To(Coordinate.Directions.NorthEast);
//Check for capture
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.NorthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
}
if (From.Rank == 5)//Check possibility of enpassant move
{
var crossSquare = From.To(Coordinate.Directions.NorthEast);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
else
{
crossSquare = From.To(Coordinate.Directions.NorthWest);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
}
}
if (From.Rank == 7)//Check pawn promotions
{
upSquare = From.To(Coordinate.Directions.North);
if (upSquare.IsEmpty(board))
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, upSquare));
}
var crossSquare = From.To(Coordinate.Directions.NorthEast);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.NorthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
}
}
else // For black pawn
{
var downSquare = From.To(Coordinate.Directions.South);
if (downSquare.IsEmpty(board) && From.Rank != 2)
{
moves.Add(new Ordinary(board, this, downSquare));
var twoDownSquare = downSquare.To(Coordinate.Directions.South);
if (From.Rank == 7 && twoDownSquare.IsEmpty(board))
{
moves.Add(new Ordinary(board, this, twoDownSquare));
}
}
if (From.Rank != 2)
{
var crossSquare = From.To(Coordinate.Directions.SouthEast);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.SouthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
}
if (From.Rank == 4)
{
var crossSquare = From.To(Coordinate.Directions.SouthEast);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
else
{
crossSquare = From.To(Coordinate.Directions.SouthWest);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
}
}
if (From.Rank == 2)
{
downSquare = From.To(Coordinate.Directions.South);
if (downSquare.IsEmpty(board))
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, downSquare));
}
var crossSquare = From.To(Coordinate.Directions.SouthEast);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.SouthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
}
}
return(moves);
}
