Some bugs in Chess in mac os 10.13.4
MacBook Pro TouchBar and Touch ID, macOS High Sierra (10.13.5)
MacBook Pro TouchBar and Touch ID, macOS High Sierra (10.13.5)
Perhaps it had been 'mating'
You’re playing a Crazyhouse game. It’s supposed to do that; you can do the same by dragging any of the white pieces on the right side to an empty space.
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Some bugs in Chess in mac os 10.13.4