Starcraft

Alright...So...Like the title said, this strategy will include some useful build orders for TvT ..

Well..Here goes!

For maps like luna, TvT often players will go 2 factory vultures+speed/mines, which they will place mines outside your base so that you cannot expand and will be contained in your base for some time,so, choosing the right build order will be very important..

Here I'll list builds that arn't good against this:

1)2 Factory tank/goliath
Why: No detector, so you'll most likely to be contained in your base while your opponent expands, you will waste alot of money on those expensive units, which you will be limited in $$ and you will have to expand after your opponent does it so that means you will fall behind in econemy and die. Even if you get to expand at the same time as your opponent does it, you will be having less units compared to your opponent, which isnt a very good thing, he can just have vultures rush in your base while avoiding everyone and go straight for workers, well...In maps that have large ramps like luna.

2)1 Factory tank->Starport->Drop
Why: Go drop your opponent and watch 8 speedy vultures rush in your base and rape your workers.

3)Wraith rush
Why: Go kill their workers with your wraiths, and vultures will pop in your base and kill all of your SCVs, retreating will be too late and keep on killing your opponents worker wouldn't be a good idea aswell because he will be having more vultures than your wraiths and they kill workers faster.

Good counter for this build:

1)Early expo+Bunker->Rax and Ebay as obstacle->Tank gol drop
How to do this: Do the usual TvT build order and make 4 marines after barracks its done for 1)Counter 2rax marine rushs 2)Fast expand without being vulture rushed. Make 1 factory and while its still under constructing, build a bunker at your expo and fly your rax to where your bunker is, and land at the entrance to block the way, build and ebay there later and stuff the choke with tanks, expand when you feel you've givin your enemy enough pressure(Drops...)

2)3 Factory vultures->Expand
How to do this: 3 Factory pump vultures witt no addons-->Expand when you fight off your opponents first vulture rush and you should have addon now, counter.If your opponent doesn't attack you then scout your opponents base and decide if you should attack or not.
Why:3 Factory vultures without upgrades can easily outnumber 2 factory vultures with mine and speed, since mines won't blow up vultures which means they wasted some money on researhing mines, which will be better if they added another factory instead. But its too late =P

For 2 factory tank gol drops:
Things NOT to do:

If its a map with small ramp like lost temple, DON'T go for vultures, it'll be kind of hard for them to get up the ramp since there will be tanks and goliaths blocking your way.

Don't go wraith rushing your opponent, since wraith ain't gonna do much of a thing to siegh tanks while goliaths are around. And they will be having either a comsat station or some turrets..

Best build for this:

1)2 Factory tanks:
Why: Tanks>Goliaths, and you will have more tanks than your opponent, so that means his goliaths are pretty much useless.

2)Do the same as your opponent, and try to take out his expansion while you expand yourself ASAP.

3)2Rax marine rush:
I've posted a replay about that strategy. Basically its: 2 Rax near your opponents base and pump marines until around for then take some SCVs with you to your opponents base, build bunker and try not to let your marines die. Do this only if you see your opponent with 1 marine and flys his barracks to scout you.

For wraith rush:
Things NOT to do:
1)2 Factory tanks:
Why:This is kind of obvious huh?

2)When your far from your opponent, don't drop ...You wouldn't want your dropships to get killed by wraiths on its way ..You can do this in late games though your opponent should've switched to tanks+goliaths by that time.

Best build for this:

1)3Factory vultures:
Why:Vultures massacre SCVs faster than wraiths, and you won't be having tanks when they get into your base.Even if you do have 1 or 2 they are gonna get outnumbered and die.

2)Drop goliaths in his base if you manage to get past his wraiths.

3)2 Rax marine rush works well here aswell. Since he won't be getting any ground units until wraiths come out.

Finally...How to counter 2 Rax marine rush...Personally, I've never managed to hold them off...Its either because that I'm an idiot or my opponents too strong. Whatever..So heres how you counter it:
2 factory vultures, they own marines, and you will be having around 2 of them when your opponent charges in your base with 6 marines and 3 SCVs, 2 vultures will be enough to micro against your opponents marines, focus on your opponents SCV if its building a bunker, if your opponent somehow manages to build a bunker, then click on the 'surrender' button.
4 marines will be good enough aswell and will also let you expand earlier than your opponent, just have SCVs at your choke and 4 marines behind them, since your marines are on high ground and your opponents marines can't get up because of your SCVs, your marines will be givin 70% chance that a ranged attack won't hit them.

So...Thats about all for now, might add more stuff later.