"mood" is a variable that you can set and use in your formula. Its only
purpose is to be used in your formula; it does nothing by itself. It
is a rather advanced feature of formulas; make sure you have experience
setting your formula before trying "mood".
Say, sometimes you are at work and only play blitz while the boss is out.
But when you're at home you play standard with people within 200 points of
your rating. Also, you sometimes like to play wild and standard with people
outside of your rating range. With the mood variable you can make one
formula to handle all 3 of these cases:
set formula (mood = 0 & blitz) | (mood = 1 & standard & rating > myrating-200
& rating < myrating+200 ) | (mood = 2)
This way depending on what mood you are in you could:
set mood 0 -- only allows blitz challenges
set mood 1 -- only allows standard within 200 points of you
set mood 2 -- allows all challenges
NOTE: When you log on your mood is automatically set to 0. You should make
your most common mood to be 0 so you don't have to switch it all the time.