Please excuse my bad grammer, english isn't even my second language.
Hello everyone this is HTOMario and I am a Terran Mech player at grandmaster in heart of the swarm. I want to share with you my secrets and thoughts on defeating protoss in this matchup. I have faced many high level protoss and practice this match up the most as for mech it is the hardest to master.
The TvP early game is all about the right opener, you want an opener that is diverse. You wish to be able to attack and defend anything with the proper scouting. For this reason we've chosen the 1-1-1 with some variations. The builder order is below.
Scouting and countering.
With the build order we can transition very safely into any kind of defense, weather it be siege tank marine to stop gateway pushes, or marine widow mine to stop air pushes this build can produce them all. One of the problems players face is the blink stalker all in or the immortal bust. Here is how we can stop the various cheeses.
A) The Dark templar rush. Since we have walled off you can hold energy at 6:45 to decide on if you think it's a templar rush or not. If you do think so simply drop an engineering bay and tech lab on the stargate. Once you see the dark templar just scan to scare it away with a scan while he attacks your wall and proceed to build detection.
B) The blink stalker Rush. We already have a reactor for marines and this helps greatly. From here all we need to do is produce marine, tank and medivac. This will make you completely safe near your production facilities. It's very handy that we already make these near our mineral lines. Once you've confirmed that it's blink stalker put down 2 more bunkers inside your base. 1 near your mineral line 1 near your production. Making it even harder for him to do any damage.
From here you simply produce marine tank and get an extra barracks for stim. Once stim has finished feel free to base race him, take 1/2 your workers and walk up to him with marine tank medivac scv. This should simply steam roll him with the amount of units you have. If he decides to base race just lift your buildings to a corner and you will win. Do try to produce a single raven though in case he turns this into a dark templar contain.
C) The 4 gate, just lower your supply depo's and surround your bunker with scvs to repair. This really just is a free win if scouted right. Feel free to throw down another bunker in base if you are worried.
D) The immortal push. With the bunker at the front we just place 2 bunkers further in the base to cover the ramp but can't be hit from the bottem. From here just produce units and send out drops to attack his main with a widow mine or a few marines.
E) The oracle rush. If you suspect an oracle rush you will have plenty of marines to deal with it. Just keep 1 in the bunker and chase the oracle until your widow mine finishes on time. If you're worried drop a bunker near your mineral line and voila you're safe. If you notice that he's hording oracles produce vikings as well while teching to a thor. A single one will make you very very safe.
Different ways to harass
Harass is it necessary? NO! but it sure as hell helps! Some opponents will just crumble to your harass and to be honest mech is immobile. You can keep up with a protoss if you really are playing well but it's so much funner to decimate them with harass.
So how do we decide which harass to do? We follow some simple rules.
Does he have detection? > No > Widow mine drop / Cloak banshee
Does he have detection? > Yes > hellion poke / drop / Raven harass
Does he have a stargate? > Yes > Hellion drop / Widow mine drop
Does he have a third? > Yes > Hellion poke / drop, Does he have a stargate? No > place raven near third to hunter seeker workers every so often.
Counter the compositions. What unit comp to work on depending on what you scout.
Immortal / Archon < Ghost, hellbat, medivac, thor.
Zealot / immortal < Banshee ghost hellbat medivac.
Pure gateway < Widow mine or hellbat, siege tank
Gateway HT < Hellbat, ghost, thor, medivac, 3 siege tanks.
Voidray < Widow mine, thor, few hellbats.
Tempest < Raven, thor, viking, widow mine.
Tempest HT < Raven, thor, viking, ghost, widow mine.
Carrier < Widow mine, thor, viking, raven.
Carrier HT < Thor viking, ghost, widow mine.
5 factory 1 starport 1 barracks, into 7 factory 3 starport 2 barracks for late game.