iChess Moves

Castling

Once in every game, each king is allowed to make a special move, known as castling. Castling consists of moving the king two squares towards a rook, then placing the rook immediately on the far side of the king. Castling is only permissible if all of the following conditions hold:

• Neither of the pieces involved in the castling may have been previously moved during the game.
• There must be no pieces between the king and the rook.
• The king may not currently be in check, nor may the king pass through squares that are under attack by enemy pieces. As with any move, castling is illegal if it would place the king in check
• The king and the rook must be on the same rank (to exclude castling with a promoted pawn).

When the king has the option to castle tapping it will show an available move two squares toward the rook.



Tapping the king's destination square will cause the castling move to occur.




En passant

When a pawn advances two squares, if there is an opponent's pawn on an adjacent file next to its destination square, then the opponent's pawn can capture it and move to the square the pawn passed over, but only on the next move.



In this case the black pawn at f5 has advanced two squares and passed the white pawn at e5. The white pawn now has the option to take the black pawn and move to f6.