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In replays, I see Terran players using Marine blobs to have the marine move a bit then attack then move a bit then attack then move a bit then attack. What is the reason for doing this micro?

Are there other micro moves for Terran infantry?

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Since this question seems to be mainly about the "run and gun" technique (referred to as 'stutter step' in the answers), it is partially a duplicate of 'Micro question: Stalker vs Zealot' which also explains the technique. –  Wikwocket Dec 3 '10 at 2:57

4 Answers 4

up vote 18 down vote accepted

The benefit of this fancy micro is to 'run and gun'. Marines have a set attack speed, meaning if they are standing still they will shoot, stand still, then shoot again.

So by moving between shots you can constantly be moving away from melee attackers you can kite them (prevent them from hitting you therefore taking far less damage) while still doing the maximum amount of damage (because you shoot every time its off cool down). This becomes even more effective when you mix in mauraders with their concussive (slowing) shells.

To answer your question, this can be extended to ANY ranged unit in the game. It is very common with hellions, thors, marines, and mauraders with Terran

To do this micro, right click away from the enemy unit (ordering a moving command), press the A (attack move command) and left click (this will cause your marines to shoot anything within range) then order another move command; repeat.

Hope this helps!

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You can still micro void rays and sentries by allowing them to shoot two targets at the same time, by rapidly attacking the two targets back and forth. This abuses the way the "damage cooldown" applies per target instead of per VR/Sentry. –  Resorath Dec 3 '10 at 0:13
    
@Resorath possibly the single most awesome comment ever! I had never heard that before –  Aardvark Dec 3 '10 at 0:15
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@Res they patched that in 1.2 –  tzenes Dec 3 '10 at 1:05
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Stutter step trainer can also be found here –  tzenes Dec 3 '10 at 1:10
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Alternately, instead of pressing attack move you can simply press "stop" and the units will attack the closest enemies. Not only does this eliminate the extra finger action, it also reduces the likelihood you'll accidentally A+click on one of your own units and kill it with friendly fire, which happens to beginners more often than you'd expect. –  Lotus Notes May 20 '11 at 20:49

I think the stutter step is an important technique to master, but an vastly more important technique is splitting your units.

Consider a nice and tight Marine ball using stutter step to run away from a group of banelings. Eventually, one or two will make it.

Now consider, instead, splitting up your marines.

This is a technique that MarineKingPrime (formerly known as Boxer, though not the same player as SlayerS_Boxer) is famous for in his ZvT and lead him to be runner up at GSL2. By quickly splitting his Marines, he was able to mitigate almost all of the splash damage.

The goal here is not to save all of your Marines, but instead to save most of them. It's a technique that was pioneered in Broodwars to deal with Zerglings and Zealots. Given a clump of Marines separate them in sections away from the center. As a result, melee units (which Zerglings and Zealots happen to be) are forced to finish off single clumps before moving on to the next. This additional travel time is gained DPS time. In the case of Banelings, you get the added benefit of less splash damage.

The penalty for screwing up a split is losing only a portion of your Marines, while the penalty for screwing up a Stutter Step is to lose almost all of them.

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Thanks for the info on marine splitting up technique. –  Dat Chu Dec 3 '10 at 2:15
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Not losing all your marines to banelings/siege tanks is probably a more important skill –  Nick T Dec 3 '10 at 2:30
    
Just a note: Boxer/Foxer/OptimusPrime named his account MarineKing since he only wanted to call himself Optimus if he won GSL - which he didn't. –  dbemerlin Dec 3 '10 at 12:56
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@dbemerlin look for MarineKingPrime.WE, that's how he's listed on GSL –  tzenes Dec 4 '10 at 1:29
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@Bora updated, it's not as good as the original, but it is a video of MKP –  tzenes Sep 11 '13 at 16:19

There are multiple scenarios in which stutter step should be used:

  1. Retreating your army: You can do some damage while you run away.
  2. Attacking fleeing opponent: You can maximize your damage until your enemy escapes. Usually this is the fastest way to kill the first scouting probe in a game.
  3. Attacking through a narrow choke: As you have to go through a choke your concave will be worse. But if you push further into your enemys troops (until they stand right next to each other) more and more units of your own can shoot them. Again you maximize your damage during sliding forward.

There is an optimal move speed. If you move too far you miss some time and your shot gets delayed, which reduces the overall damage. If you move not far enough you miss on movement. If you move too fast after you shoot you cancel the shot and thus reduce your damage.

The execution is as follows: Right click where you want to move (not attack move), press "S" on the perfect timing. Wait for the marines to shoot (start animation), cancel animation with another right click.

It is possible to calculate the effectiveness of your stutter step (e.g. 95% damage). For this you need to take two equal sets of marines (e.g.: 1 and 1) the first set shoots a stationary target. The second set shoots a slow unit (like a queen off creep). Compare the damage dealt to the stationary target with the damage dealt to the moving target after X seconds. If they are equal you do 100% and you have microed your marines perfectly.

QXC created a training map for this: http://www.teamliquid.net/forum/viewmessage.php?topic_id=149218

It also calculates the damage for you, pretty handy.

There are other ways to micro your marines. They have all the same basics, but different intentions.

Splitting: You retreat will your whole army. While retreating you select a subset of your marines and click on another location where they should move. Repeat that with other subsets of marines. Basically you want some of them to stand and shoot while the others move away. So they kill some banelings and if banelings hit then only a few die.

Creating a better concave: You reatreat a bit. While you reatreat you select a subset of your marines and click next to the location where the other marines will run. Repeat this with other subsets. Your goal is to build a (concave or line). This way you have a perfect concave if the enemy units arrive and they clump up.

Running in circles: Suppose it is early game and you have a 2 marines and a zealot attacks. If you stand your ground you die. Split them and select the marine which is targeted by the zealot. Run him around the other marine (Issue a command queue) while he is shooting the zealot. If he targets your other marine just switch the roles. This gets harder the more units are involved.

Focus on single target: If you focus an enemy unit it dies very quickly. This is better than attacking multiple targets and removing half their HP, as still all of them can shoot you. This way you take less overall damage.

Falling back with injured units: This is the "counter" to Focus on single target. If you see one of your units taking damage. Select it and click somewhere (not too far) behind your army. The unit will walk away from the battle with few HP. Another unit will be targeted by your enemy, but your weak unit will return automatically to the battle (this is why you do not click too far away) and attack again. Your overall damage increases.

There are many other techniques, but it would take too long to explain all of them.

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You should also know that this technique can be used on the offence. Im not sure of the match but TLO uses stim marines and marauders succesfully to take out 2 collosus and stalkers. He uses it so that he can get his whole army firing, instead of having marines running around in the back that is common in stationary armys. IT also stops the Protoss army escaping and forces him into battle whether he is prepared or not. Its actually a suprising outcome when you watch it, just shows how key upgrades and this method is.

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