PyChess

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icositetrachoron

So recently I stumbled across this server online that lets you play variants like capablanca, grand, crazyhouse, shogi, and xiangqi. It has a interface similar to |L|I|C|H|E|S|S| (slightly encoded for moderator reasons), and it's pretty advanced. Try it here.

See here for a sample game.

Note: I am not posting this in the public forum since the mods might think it's a "competitor site."