It is possible to navigate through the various games displayed by clicking on particular squares on each board. E.g. click on a1 to go to the start of a game, and e1 to advance a move, d1 to back up a move, etc.
For help on using this capability, make sure your browser will allow pop-up windows, then hit the <ESC> key. (If no help window appears, try clicking on any h7 square, then hit <ESC> again.)