Puzzle Improvements
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I like it -- I've always been irked by the fact that the "Restart Puzzle" link goes away after I've solved it. I have to refresh the page to get it back into puzzle mode. If the main variation (i.e. the solution) were just one of the available variations this would address that too.
Sometimes I think it would be nice to be able to post puzzles with variations without having to post multiple diagrams. For example, after solving the puzzle the user gets a message below the puzzle "Congratulations, You've solved this variation! Click here for the next variation" and it takes them back earlier in the puzzle and the opposite side tries a different move.