I see players shift-click move their units back and forth all the time in replays online. Why do they do that? Wouldn't a hold position command achieve the same thing?
Starcraft – Why do players shift-move units back and forth
starcraft-2
Related Solutions
Using your example, you could double click or Ctrl + click on a Stalker to select all of them and then Shift + click the left-most Stalker listed on the HUD six times. This would remove six Stalkers from the originally selected ten. Whether this is any less cumbersome, you be the judge.
Instead of doing subtraction to know to click six times, find the fifth stalker, (number you want + 1) and repeatedly shift click that one until there is no fifth stalker.
"Unit Tester Online" is a very good unit testing map:
With this map you can easily create different unit combinations to test them. There are many options (like different terrain, enabled upgrades,...) to customize the battle you want to test.
You can play this map together with other people online, but it will not create replays.
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Best Answer
A unit moving back-and-forth is can be harder for enemy units to kill (especially with melee units).
A common example of this is in PvZ when Protoss sends a Probe to try and block Zerg's Hatchery. If the Probe was stationary, it would be a lot easy/quick to kill it; for this reason, Protoss players shift-click and move their Probe all around the Hatchery location to stay alive as long as possible, thereby delaying Zerg's Hatchery.