Anomitee

I'm getting this bug in 1.7.2, but some things do work:

You can add, set and remove from a score of an offline, nonexistent, untracked (not on the scoreboard) players as long as you explicitly mention their name like such:

/scoreboard players (add|set|remove) <anyone> <objective> #

Unfortunately, selectors (selecting players using @) don't work, all of the following do not work for offline players:

/scoreboard players add @a points 1
/scoreboard players add @a[name=offlineplayer] points 1
/testfor @a[score_points_min=100]
/testfor @a[name=nonexistantplayer]
/testfor @a[team=theotherside,name=nonexistantplayer]

and any other format that makes use of @.

To recap:

• all @ selectors cannot/do not target offline players, even if they are tracked

• /testfor offlineplayer also doesn't detect offline players, but this is intended

• @a should be able to target offline players if they are tracked

• alternatively, @t could be added instead to target all tracked players (both online and offline), leaving @a to target online players.

Also, it appears you can also achieve this by sprinting whilst not flying (both methods of sprinting work), then double jumping whilst still sprinting.

Confirmed for 1.7.2. This can be tested by flying close to the ground on a superflat map, and breaking/placing blocks at 1 second intervals whilst flying normally and whilst "sprint" flying.