This is going to be from the perspective of a terran player. Cannon rush is highly effective if it catches you off guard and you do not know how to respond to it. Many people see this cannon rush as “cheese” and that it “messes up the game”, but it’s very possible to get past as long as you follow these steps.
You are going to build a supply depot at a choke point, standard stuff, you are going to take that scv and send him to the opponents base and try to scout him, take another scv and patrol the corners of your base, and put him on the patrol root.
If you see a pylon on your base, you can surround it with your Scv’s and kill that pylon, and that’s that. End of the cannon rush.
If You Do Not See It
So you don’t see it initially and you see that he begins building his photon cannons. Well, there’s something that you should do, you should build a barracks near your opponents base inside of your base.
Going for the cannon rush is a all or nothing thing, so it’s quite risky, building a barracks should be done with that initial scouting SCV. You also want to go ahead to a far off expansion and create a nice command center.
You should also move the command center that’s being attacked to a nearby expansion so that you can escape these photon cannons. Build some marines that you’ve built at the front of your base, and pump out some marines at the barracks that you created at your opponents base as well.
Now with those marines that are at the enemies place. Your priority should be to stop his mineral flow and destroying his probes. If you do this soon you can prevent expansion. You also want to take out the forge as well so you can prevent him from making cannons.
Meanwhile at Your Expansion
Build up barracks, factories, refinery, supply depot, that standard stuff, and you want to try to mass on marines. You will be in a tough situation, so you want to try to go and take out his nexus and try to take out his economy. You can take out any photon cannons by putting your tanks into siege mode and simply range destroying them.
And that’s it! Cannon Rush Cheese has been melted. (I know, that was a terrible pun…)
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