It will be painful if most of the time playing chess game using Mac always stick with Computer as enemy (Human vs. Computer) or Regular Chess playing style. Fortunately, Mac Chess supports different kinds of enemy (and their sound) we want and various kinds of Chess variant.
This action cannot be set during the playtime. It should be started from the very beginning of the game. Press Command-N to start a new game, and then these settings can be set.

Chess players including playing with friend using Human vs. Human Mode, challenging Mac intelligence using Human vs. Computer Mode if it's preferred to take the first turn or Computer vs. Human Mode to take second turn, or enjoying Chess battle using Computer vs. Computer Mode.
There are bunch of chess variations played by people all over the world.

Fortunately, inside Chess, there are also several kinds of these variants :
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