chess.com

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MathBandit

The only other chess site I've tried was GameKnot, which, admittedly, has one very nice feature that chess.com does not have, and a few additions to another feature, but chess.com is much better.

The features I speak about is a direct link to their Game Database from the game page, with the current board position loaded, and the small perk that the analysis board recognizes check, checkmate.