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The duck is a brick - pieces cannot move through the square occupied by the duck. However, knights can jump over the duck. Each player’s turn has 2 steps: After moving a piece, the duck must be moved to a different and empty square. There is no check or checkmate. Capture the opponent’s king to win. (Invented by Dr Tim Paulden.)
ketchuplover: yes but it has to move each time. This gives an incredible boost of strategic and tactic possibilities, and since at every turn there are more than 600 different moves (regular move + duck move combined), it's quite impossible to make a decent competitive engine.
Apologies if something like this has been suggested: logik but with a backgammon doubling cube.
Players play to a certain number of points - a point a game. Either player (say player A) has the option of doubling before a move. If accepted points are doubled, but player B also wins the points if it's a draw. If player B accepts (and is confident!) he can immediately redouble but in this case points are shared if it's a draw
A proposes a double B declines 1-0 B accepts, A wins 2-0 B accepts, B wins 0-2 B accepts, draw 0-2 B accepts and redoubles, A wins 4-0 B accepts and redoubles, B wins 0-4 B accepts and redoubles, draw 2-2