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I have added the ability to take back moves, and I have removed some more
bugs. Yesterday, the PBM was mailing the wrong URL to users. Instead of
putting your userid in the URL, it would put your opponent's there. That
is now fixed. I also fixed how it displays movelists with branches.

To take back moves, use the drop down menu displaying the movelist to go
back to the last move you want to keep in the game. This should be one of
your opponent's moves, not one of your own. Although the menu is supposed
to disable all of your past moves in the list, Internet Explorer ignores
this. I'll have to change it so that selecting one of your moves takes
you back to one of your opponent's moves. The last move should be one of
your opponent's moves, so that the next move will be yours. You should
not just select the past move in the menu; you should click the 'Go'
button to go back to it. Once the board is updated, you can make a new
move from that point in the game. When you verify your move, your new move
will appear at the end of the movelist, and all moves between it and the
move you went back to will be branched out of the main game. They will
still appear in the movelist, but your new move will now continue the main
branch of the game.