"The Internet Chess Club has dramatically modified the way chess will be played for all time." — Chess Life, official magazine of the United States Chess Federation
The xobserve command is very similar to the observe command: it causes you
to begin watching the specified game. The difference is, it will cause you
to stop observing any other games that you are already observing. You will
end up observing only the one game you specify with the xobserve command.
If you "xobserve" a game you are already observing, nothing happens. You will
still be observing it.
"xobserve" without any arguments causes you to observe the current game of a
person you are following (with a previous "follow" command). This can be
useful for watching simuls. You just type "xob" each time you want to move
to the current game of the simul giver. If you aren't following anyone, you
get a message to that effect.