Clobber

a6 white circleb6 black circlec6 white circled6 black circlee6 white circle
a5 black circleb5 white circlec5 black circled5 white circlee5 black circle
a4 white circleb4 black circlec4 white circled4 black circlee4 white circle
a3 black circleb3 white circlec3 black circled3 white circlee3 black circle
a2 white circleb2 black circlec2 white circled2 black circlee2 white circle
a1 black circleb1 white circlec1 black circled1 white circlee1 black circle
Starting position for 5×6 Clobber

Clobber is an abstract strategy game invented in 2001 by combinatorial game theorists Michael H. Albert, J.P. Grossman and Richard Nowakowski. It has subsequently been studied by Elwyn Berlekamp and Erik Demaine among others. Since 2005, it has been one of the events in the Computer Olympiad.