Guess the move supports per move comments and tags. As you move around in the game, the current move and move number is shown in the position comment/tag section title, and any comment or tag made or viewed will be relevant to the current move. You can also make general comments/tags that are relevant to the entire game by jumping to the start of the game, before the first move is played, and the comment/tag title bar changes to "Entire Game", at which point comments/tags made or viewed are referring to the entire game rather than a particular move.

In addition to the per move position comment view, there is also an "All Comments" view which is a covenient way of reading over all comments made on a game. You can jump to any position in the "All Comments" view by clicking on the move header for the relevant move. The "All Comments" view also allows adding an additional comment to allready commented moves.