Submitted by DrDave on Sun, 06/11/2016 - 16:34
It's like chess, only with a duck. The duck is on the chess board at all times. It cannot be moved through or taken, and the square it occupies is for the duck alone. Every chess move must be followed by a duck move. The duck can be moved to any square on the board. So, a game might start: 1. e4/De6 (preventing 1...e5 and 1...e6) 1...c5/De2 (preventing developing of Queen or Bishop) 2.