How can I beat Scorchilla games? It looks like whoever gets 2 of them first just basically wins the game because there rarely is a way to absorb 6, and somehow it's always my opponent.
If you are player 2 (black), then you are the player doing the scorchilla rush.
If you are player 1 (white), then you are in for a rough time. I don't know if it is possible to beat a scorchilla rush with the base units, so you have to look into the advanced units for a way out of this.
Things to remember are that the scorchilla rush is trying to breach you hard and early. So either you use cheap high health units, or you follow a strategy that is breach-resistant (i.e., avoid tarsiers). You don't need prompt units for defense, because you know exactly when your opponent is going to attack; just build your defenses one turn earlier, non-prompt units are usually more cost efficient. High absorb is also less important than in a normal game, because your opponent is only attacking one turn out of three (so your total absorb is divided by three).
Another thing to remember is that the scorchilla player is doing a rush. She will probably stay at 12 drones for most of the game. Build some relatively early aggression so that she needs to devote money to defense, and her attack will never increase too much. Scorchillas are dangerous, but they are still quite expensive in the long run, costing 7RG for one attack per turn. Build more efficient attackers and she will fall.
EDIT: if you are looking into ways of defending from the initial 6 attack, an initial idea would be to open T1:DD T2:DD, and if your opponent buys a conduit on her second turn, go T3:DDBlastforge T4:DDSteelsplitter T5:DWallAnimus or T5:DDWallConduit, depending on what is available. If better defenders are available, use your better judgement. This leaves you with a slightly better economic position than your opponent, that you can hopefully transform into a win.
You could also try scaring the second player out of the scorchilla rush by overrushing, but I doubt that is a good idea. T1:DD T2:Conduit T3:Animus T4: Scorchilla*2 is technically possible, but it leaves you with only 8 drones. You can follow this until your opponent abandons the scorchilla rush, and then you switch to something less suicidal.