// calculate the possible moves for the king piece and insert them into passed array
private void GetKingMoves(Cell source, ArrayList moves)
{
Cell newcell;
// King can move to any of it's neighbor cells at the distance of one cell
// check if king can move to top
newcell = MainBoard.TopCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// check if king can move to left
newcell = MainBoard.LeftCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// check if king can move to right
newcell = MainBoard.RightCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// check if king can move to bottom
newcell = MainBoard.BottomCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// check if king can move to top-left
newcell = MainBoard.TopLeftCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// check if king can move to top-right
newcell = MainBoard.TopRightCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// check if king can move to bottom-left
newcell = MainBoard.BottomLeftCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// check if king can move to bottom-right
newcell = MainBoard.BottomRightCell(source);
if (newcell != null && !newcell.IsOwned(source)) // target cell is empty or is owned by the enemy piece
{
moves.Add(newcell);
}
// Check castling or tower moves for the king
if (MainBoard[source].piece.Moves == 0)
{
Cell CastlingTarget = null; // The cell where king will be moved in case of castling
// As king has not yet moved, so castling is possible
newcell = MainBoard.RightCell(source);
if (newcell != null && newcell.IsEmpty()) // cell is empty
{
if (!CauseCheck(new Move(source, newcell))) // Inbetween cell is not under check
{
newcell = MainBoard.RightCell(newcell);
if (newcell != null && newcell.IsEmpty()) // cell is empty
{
CastlingTarget = newcell; // This will be the king destination position
newcell = MainBoard.RightCell(newcell);
if (newcell != null && !newcell.IsEmpty() && newcell.piece.Moves == 0) // check if the rook piece has not yet moved
{
moves.Add(CastlingTarget); // Add this as possible move
}
}
}
}
// Check on the left side
newcell = MainBoard.LeftCell(source);
if (newcell != null && newcell.IsEmpty()) // cell is empty
{
if (!CauseCheck(new Move(source, newcell))) // Inbetween cell is not under check
{
newcell = MainBoard.LeftCell(newcell);
if (newcell != null && newcell.IsEmpty()) // cell is empty
{
CastlingTarget = newcell; // This will be the king destination position
newcell = MainBoard.LeftCell(newcell);
if (newcell != null && newcell.IsEmpty()) // cell is empty
{
newcell = MainBoard.LeftCell(newcell);
if (newcell != null && !newcell.IsEmpty() && newcell.piece.Moves == 0) // check if the rook piece has not yet moved
{
moves.Add(CastlingTarget); // Add this as possible move
}
}
}
}
}
}
}
// calculate the possible moves for the Rook piece and insert them into passed array
private void GetRookMoves(Cell source, ArrayList moves)
{
Cell newcell;
// Check all the move squars available in top direction
newcell = MainBoard.TopCell(source);
while (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
break; // force quite the loop execution
}
if (newcell.IsOwned(source)) //next cell contains owner object
{
break; // force quite the loop execution
}
newcell = MainBoard.TopCell(newcell); // keep moving in the top direction
}
// Check all the move squars available in left direction
newcell = MainBoard.LeftCell(source);
while (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
break; // force quite the loop execution
}
if (newcell.IsOwned(source)) //next cell contains owner object
{
break; // force quite the loop execution
}
newcell = MainBoard.LeftCell(newcell); // keep moving in the left direction
}
// Check all the move squars available in right direction
newcell = MainBoard.RightCell(source);
while (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
break; // force quite the loop execution
}
if (newcell.IsOwned(source)) //next cell contains owner object
{
break; // force quite the loop execution
}
newcell = MainBoard.RightCell(newcell); // keep moving in the right direction
}
// Check all the move squars available in bottom direction
newcell = MainBoard.BottomCell(source);
while (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
break; // force quite the loop execution
}
if (newcell.IsOwned(source)) //next cell contains owner object
{
break; // force quite the loop execution
}
newcell = MainBoard.BottomCell(newcell); // keep moving in the bottom direction
}
}
// calculate the possible moves for the queen piece and insert them into passed array
private void GetQueenMoves(Cell source, ArrayList moves)
{
Cell newcell;
// Check all the move squars available in top-left direction
newcell = MainBoard.TopLeftCell(source);
if (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
}
}
// Check all the move squars available in top-right direction
newcell = MainBoard.TopRightCell(source);
if (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
}
}
// Check all the move squars available in bottom-left direction
newcell = MainBoard.BottomLeftCell(source);
if (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
}
}
// Check all the move squars available in the bottom-right direction
newcell = MainBoard.BottomRightCell(source);
if (newcell != null) // move as long as cell is available in this direction
{
if (newcell.IsEmpty()) //next cell is available for move
{
moves.Add(newcell);
}
if (newcell.IsOwnedByEnemy(source)) //next cell is owned by the enemy object
{
moves.Add(newcell); // Add this to available location
}
}
}
// calculate the possible moves for the pawn object and insert them into passed array
private void GetPawnMoves(Cell source, ArrayList moves)
{
Cell newcell;
if (source.piece.Side.isWhite())
{
// Calculate moves for the white piece
newcell = MainBoard.TopCell(source);
if (newcell != null && newcell.IsEmpty()) // Top cell is available for the move
{
moves.Add(newcell);
}
// Check the 2nd top element from source
//if (newcell != null && newcell.IsEmpty())
//{
// newcell = MainBoard.TopCell(newcell);
// if (newcell!=null && source.piece.Moves == 0 && newcell.IsEmpty()) // 2nd top cell is available and piece has not yet moved
// moves.Add(newcell);
//}
// Check top-left cell for enemy piece
newcell = MainBoard.TopLeftCell(source);
if (newcell != null && newcell.IsOwnedByEnemy(source)) // Top cell is available for the move
{
moves.Add(newcell);
}
// Check top-right cell for enemy piece
newcell = MainBoard.TopRightCell(source);
if (newcell != null && newcell.IsOwnedByEnemy(source)) // Top cell is available for the move
{
moves.Add(newcell);
}
// Check for possible En Passant Move
Move LastPawnMove = LastMoveWasPawnBegin();
if (LastPawnMove != null) // last move was a pawn move
{
if (source.row == LastPawnMove.EndCell.row) // Can do En Passant
{
if (LastPawnMove.EndCell.col == source.col - 1) // En Passant pawn is on left side
{
newcell = MainBoard.TopLeftCell(source);
if (newcell != null && newcell.IsEmpty()) // Top cell is available for the move
{
moves.Add(newcell);
}
}
if (LastPawnMove.EndCell.col == source.col + 1) // En Passant pawn is on left side
{
newcell = MainBoard.TopRightCell(source);
if (newcell != null && newcell.IsEmpty()) // Top cell is available for the move
{
moves.Add(newcell);
}
}
}
}
}
else
{
// Calculate moves for the black piece
newcell = MainBoard.BottomCell(source);
if (newcell != null && newcell.IsEmpty()) // bottom cell is available for the move
{
moves.Add(newcell);
}
// Check the 2nd bottom cell from source
//if (newcell!=null && newcell.IsEmpty())
//{
// newcell = MainBoard.BottomCell(newcell);
// if (newcell!=null && source.piece.Moves == 0 && newcell.IsEmpty()) // 2nd bottom cell is available and piece has not yet moved
// moves.Add(newcell);
//}
// Check bottom-left cell for enemy piece
newcell = MainBoard.BottomLeftCell(source);
if (newcell != null && newcell.IsOwnedByEnemy(source)) // Bottom cell is available for the move
{
moves.Add(newcell);
}
// Check bottom-right cell for enemy piece
newcell = MainBoard.BottomRightCell(source);
if (newcell != null && newcell.IsOwnedByEnemy(source)) // Bottom cell is available for the move
{
moves.Add(newcell);
}
// Check for possible En Passant Move
Move LastPawnMove = LastMoveWasPawnBegin();
if (LastPawnMove != null) // last move was a pawn move
{
if (source.row == LastPawnMove.EndCell.row) // Can do En Passant
{
if (LastPawnMove.EndCell.col == source.col - 1) // En Passant pawn is on left side
{
newcell = MainBoard.BottomLeftCell(source);
if (newcell != null && newcell.IsEmpty()) // Bottom cell is available for the move
{
moves.Add(newcell);
}
}
if (LastPawnMove.EndCell.col == source.col + 1) // En Passant pawn is on left side
{
newcell = MainBoard.BottomRightCell(source);
if (newcell != null && newcell.IsEmpty()) // Bottom cell is available for the move
{
moves.Add(newcell);
}
}
}
}
}
}
// calculate the possible moves for the knight piece and insert them into passed array
private void GetKnightMoves(Cell source, ArrayList moves)
{
Cell newcell;
// First check top two left and right moves for knight
newcell = MainBoard.TopCell(source);
if (newcell != null)
{
newcell = MainBoard.TopLeftCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
newcell = MainBoard.TopCell(source);
newcell = MainBoard.TopRightCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
}
// Now check 2nd bottom left and right cells
newcell = MainBoard.BottomCell(source);
if (newcell != null)
{
newcell = MainBoard.BottomLeftCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
newcell = MainBoard.BottomCell(source);
newcell = MainBoard.BottomRightCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
}
// Now check 2nd Left Top and bottom cells
newcell = MainBoard.LeftCell(source);
if (newcell != null)
{
newcell = MainBoard.TopLeftCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
newcell = MainBoard.LeftCell(source);
newcell = MainBoard.BottomLeftCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
}
// Now check 2nd Right Top and bottom cells
newcell = MainBoard.RightCell(source);
if (newcell != null)
{
newcell = MainBoard.TopRightCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
newcell = MainBoard.RightCell(source);
newcell = MainBoard.BottomRightCell(newcell);
// target cell is empty or is owned by the enemy piece
if (newcell != null && !newcell.IsOwned(source))
{
moves.Add(newcell);
}
}
}
// Returns the cell on the bottom-right of the current cell
public Cell BottomRightCell(Cell cell)
{
return(this[cell.row + 1, cell.col + 1]);
}
// Verify conditions for black side to start counting down until stalemale
public int VerifyCountforBlack()
{
// board verification starts at a1 (top left of the board)
Cell newcell = m_cells["a1"];
// counters for enemy rooks, bishops, knights, queens and all the pieces on the board
int counterRook = 0, counterBishop = 0, counterKnight = 0, counterPieces = 0;
// sum of total value of the white / black pieces
int totalWhiteWeight = 0, totalBlackWeight = 0;
// go through all the pieces to check for pawns.
// if they exist, no stalemale can take place
while (newcell != null)
{
Cell newNewcell = newcell;
while (newNewcell != null)
{
if (!newNewcell.IsEmpty())
{
// if any pawn is found no stalemale can happen
if (newNewcell.piece.IsPawn())
{
return(-1);
}
// sum up all the player specific pieces to find who is at disatvantage
if (newNewcell.piece.Side.isWhite())
{
totalWhiteWeight += newNewcell.piece.GetWeight();
}
if (newNewcell.piece.Side.isBlack())
{
totalBlackWeight += newNewcell.piece.GetWeight();
}
}
newNewcell = this.RightCell(newNewcell);
}
newcell = this.BottomCell(newcell);
}
// if the side at advantage calls for stalemale countdown, it cannot happen
if (totalBlackWeight >= totalWhiteWeight)
{
return(-1);
}
newcell = m_cells["a1"];
while (newcell != null)
{
Cell newNewcell = newcell;
while (newNewcell != null)
{
if (!newNewcell.IsEmpty())
{
counterPieces++; // count all the pieces on the board
if (newNewcell.piece.Side.isWhite() && newNewcell.piece.IsRook())
{
counterRook++; // count white rooks
}
if (newNewcell.piece.Side.isWhite() && newNewcell.piece.IsBishop())
{
counterBishop++;// count white bishops
}
if (newNewcell.piece.Side.isWhite() && newNewcell.piece.IsKnight())
{
counterKnight++;// count white knights
}
// if there is any white piece other than the king, stalemale in 64 moves
if (newNewcell.piece.Side.isBlack() && newNewcell.piece.IsRook())
{
return(64);
}
if (newNewcell.piece.Side.isBlack() && newNewcell.piece.IsBishop())
{
return(64);
}
if (newNewcell.piece.Side.isBlack() && newNewcell.piece.IsKnight())
{
return(64);
}
if (newNewcell.piece.Side.isBlack() && newNewcell.piece.IsQueen())
{
return(64);
}
}
newNewcell = this.RightCell(newNewcell);
}
newcell = this.BottomCell(newcell);
}
// if there are 2 enemy rooks, stalemale in (8 minus number of pieces) moves
if (counterRook == 2)
{
return(8 - counterPieces);
}
// if there is 1 enemy rook, stalemale in (16 minus number of pieces) moves
if (counterRook == 1)
{
return(16 - counterPieces);
}
// if there are 2 enemy bishops, stalemale in (22 minus number of pieces) moves
if (counterBishop == 2)
{
return(22 - counterPieces);
}
// if there are 2 enemy knights, stalemale in (32 minus number of pieces) moves
if (counterKnight == 2)
{
return(32 - counterPieces);
}
// if there is 1 enemy bishop, stalemale in (44 minus number of pieces) moves
if (counterBishop == 1)
{
return(44 - counterPieces);
}
// otherwise stalemale in (64 minus number of pieces) moves
return(64 - counterPieces);
}
// Returns the cell on the top-right of the current cell
public Cell TopRightCell(Cell cell)
{
return(this[cell.row - 1, cell.col + 1]);
}
// Returns the cell on the bottom-left of the current cell
public Cell BottomLeftCell(Cell cell)
{
return(this[cell.row + 1, cell.col - 1]);
}
// Returns the cell on the top-left of the current cell
public Cell TopLeftCell(Cell cell)
{
return(this[cell.row - 1, cell.col - 1]);
}
// Returns the cell on the bottom of the given cell
public Cell BottomCell(Cell cell)
{
return(this[cell.row + 1, cell.col]);
}
// Returns the cell on the right of the given cell
public Cell RightCell(Cell cell)
{
return(this[cell.row, cell.col + 1]);
}
// Returns the cell on the left of the given cell
public Cell LeftCell(Cell cell)
{
return(this[cell.row, cell.col - 1]);
}
// Returns the cell on the top of the given cell
public Cell TopCell(Cell cell)
{
return(this[cell.row - 1, cell.col]);
}