All games are taken from the same sc2 youtube playlists:
here we go:
#1 constant suicidal marine aggression. you force the zerg to continually deal with small to medium sized MM groups, focusing on a strong fast expand and stim, to abuse the fact that replenishing banelings takes 50 seconds, while the next wave of marines only takes 30 seconds to show up.
(game demo of the build vs a 2100 diamond.
#2 fast-upgrades, turtle opening into mass marine late game... this one relies on the standard early 5marine push and engineering bay block to prevent the zerg from going too heavy on early econ, then a SUPER early CC off 0 gas and 2 rax, if roaches come of course u can just get a bunker and win, as your 5 marines will be at his base before the roaches can pop, so you'll see them. spam scvs to stay even in economy, and get fast double upgrades, at 12-14 minutes you'll be 2/2 and can basically stomp anything he has... at 0/0 lings destroy marines in small #s, and even in large #s if the marines are surrounded or spread out... at 2/2 marines beat lings of equal #s even if surrounded.
The more mutas your opponent makes vs this build, the more surely you will win, as fully upgraded marines, 6 marines (300$) if picked off by a cloud of 12 mutas (2400$) will actually kill 3 mutas before dying (600$) !! ie: even small groups of marines will do more than their weight worth of dmg vs even overwhelmingly large groups of mutas. mutas are completely shut down by this build, it is not cost effective to harass someone who can defend with almost no units. also, get the +2 armor to buildings upgrade and 1 turret on each mineral line, and 1 by your addons.
third person commentary:
first person vod masters league demo:
Probably 30 of the 35ish videos on the TvZ playlist use some variation of this build, it's my go-to build :)
#3 CHEESE: marine/scv allin
#4 CHEESE: go 2 starport behind a bunker, get 5 bainshees then pushout, if a zerg scouts the double starport a common response is to get 4-5 queens, but 5 bainshees can kill 5 queens even with a few transfuses... zerg is expecting 2-3 bainshees, surprise them with 5 :P
(game demo of the build , just a 3 minute fastforwarded speedcast to explain general concept
#5 CHEESE: thor+repair+hellions. push out at 8 minutes with 2 thors and a bunch of scvs/hellions.
(game demo of the build by a 2100 diamond, even though its a TvT, its the same build, just add on a second factory and hellions.