Chess Variants

Chess has always been variant. Today there are thousands of mutations, transformations, and reorganizations of the classic game. I’m partial to those chess programs by Torus Games which allow you to play on boards stretched over imaginary topologies like Möbius strips and Klein bottles: http://www.math.ntnu.no/~dundas/75060/TorusGames/html/Chess.html

Alongside these programs you can find thousands of custom chess boards featuring strange situations and perplexing puzzles:

http://en.wikipedia.org/wiki/Chess_variant
http://www.chessvariants.com/