Object: end up with more disks than your opponent.
 
Black and White alternate putting disks on vacant squares from an initial opening position.
Each disk must be placed so that it sandwiches a series of disks. The sandwiched disks must be either enemy disks or 'Halfbreeds' or a mix of both.
Sandwiched enemy disks turn to Halfbreeds, sandwiched Halfbreeds change to your colour.
Halfbreeds are neutral.
 
If one player can't move, he must pass his turn. The game ends when neither side can move, usually when the whole board is filled. The winner is the player with the most pieces of his color.
 
Variant 2 : The sandwiched pieces nust be either all enemy pieces or all Halfbreeds.
Variants 3, ..., 8: Like variants 1 and 2, but on larger boards.
 
Halfbreed is closely related to Reversi.
 
 
More freeware as well as real puzzles and games at my homepage http://karl.kiwi.gen.nz.