
First to touch a chess piece, the one will change its color, then touch another chess piece with the same image, if both piece can make a sraight line, then you win,if not,then you can give up the first picked one to choose the others.
Of course the time is limit, if you couldn't find the same pair of chess piece's link to delete them, when the time is up, then you LOSE, and dont give up before the game over, or you definitely lose the game.