private void AddPieces(PlayerPieceSet pieces, Players player)
{
Debug.Assert(pieces != null);
AddPiece(player, Exports.Pieces.King, pieces.KingsCell);
for (uint i = 0, e = pieces.QueensCount; i < e; ++i)
{
AddPiece(player, Exports.Pieces.Queen, pieces.GetQueenCell(i));
}
for (uint i = 0, e = pieces.RooksCount; i < e; ++i)
{
AddPiece(player, Exports.Pieces.Rook, pieces.GetRookCell(i));
}
for (uint i = 0, e = pieces.BishopsCount; i < e; ++i)
{
AddPiece(player, Exports.Pieces.Bishop, pieces.GetBishopCell(i));
}
for (uint i = 0, e = pieces.KnightsCount; i < e; ++i)
{
AddPiece(player, Exports.Pieces.Knight, pieces.GetKnightCell(i));
}
for (uint i = 0, e = pieces.PawnsCount; i < e; ++i)
{
AddPiece(player, Exports.Pieces.Pawn, pieces.GetPawnCell(i));
}
}
private static void MakePawnMoves(PlayerPieceSet my_pieces, PlayerPieceSet other_pieces,
bool is_white_to_move, int? en_passant_capture_column, List<Move> moves)
{
int move_row_diff = is_white_to_move ? 1 : -1;
for (uint i = 0, e = my_pieces.PawnsCount; i < e; ++i)
{
uint cell_index;
var pawn_cell = new ChessboardCell(my_pieces.GetPawnCell(i,
out cell_index));
var new_cell_value = ChessboardCell.CalculateValue(
pawn_cell.Row + move_row_diff, pawn_cell.Column);
// Moves without captures
if (!my_pieces.IsOccupiedCell(new_cell_value)
&& !other_pieces.IsOccupiedCell(new_cell_value))
{
WritePawnMove(pawn_cell.Value, new_cell_value, cell_index, 0,
moves);
// Two-rows move from the initial rank
int initial_row = is_white_to_move ? Chessboard.ROW_MIN + 1
: Chessboard.ROW_MAX - 1;
if (pawn_cell.Row == initial_row)
{
new_cell_value = ChessboardCell.CalculateValue(
pawn_cell.Row + 2 * move_row_diff, pawn_cell.Column);
if (!my_pieces.IsOccupiedCell(new_cell_value)
&& !other_pieces.IsOccupiedCell(new_cell_value))
{
WritePawnMove(pawn_cell.Value, new_cell_value, cell_index,
0, moves);
}
}
}
// Captures except en passant captures
// delta_column can be -1 or 1
for (int delta_column = -1; delta_column <= 1; delta_column += 2)
{
int new_column = pawn_cell.Column + delta_column;
if (new_column >= Chessboard.COLUMN_MIN
&& new_column <= Chessboard.COLUMN_MAX)
{
new_cell_value = ChessboardCell.CalculateValue(pawn_cell.Row
+ move_row_diff, new_column);
if (other_pieces.IsOccupiedCell(new_cell_value))
{
WritePawnMove(pawn_cell.Value, new_cell_value, cell_index,
Move.Flags.Capture, moves);
}
}
}
// En passant capture
if (en_passant_capture_column.HasValue
&& ((is_white_to_move && pawn_cell.Row == 4)
|| (!is_white_to_move && pawn_cell.Row == 3))
&& Math.Abs(pawn_cell.Column - en_passant_capture_column.Value) == 1)
{
new_cell_value = ChessboardCell.CalculateValue(pawn_cell.Row
+ move_row_diff, en_passant_capture_column.Value);
// Since en passant capture is allowed, we know that the destination
// cell is not occupied
WritePawnMove(pawn_cell.Value, new_cell_value, cell_index,
Move.Flags.Capture | Move.Flags.EnPassantCapture, moves);
}
// TODO - add en passant captures
// TODO - uncomment
//throw new NotImplementedException();
}
}