Object: Stalemate the opponent's king.
 
Firstly each player drops a King. Then each player has a double move: First you move your King, then you drop a blocking square.
 
If the king is enclosed by eight blocking squares, he is stalemated if he does not have an 'escape route'. An 'escape route' are two adjacent blocks positioned of the same colour pointing in one of the four orthogonal directions of the king's position. The king may then move onto the first of these blocks and capture it.
 
You lose if you are stalemated.
 
In variants 2, 3, 4, 5 another piece is used instead of the king. Note that King, Knight and Bishop move differently from the way they move in chess.
In variants 6, 7, 8, 9, 10 you are only allowed to escape three times.
Variants 11 to 20 are like variants 1 to 10, but the escape route has to be of your own colour.
 
 
More freeware as well as real puzzles and games at my homepage http://karl.kiwi.gen.nz.