If you are a Terran and playing against a Terran , you can strike the enemy tanks with vulture mines.How? The answer is not diffucult first locate the mines to the enemy Tank’s path, in normal conditions the enemy Tanks explode the mines when they are unborrowed without any damage loss.So we must prevent this ability by making the enemy ally for a short time, when he is near to the burrowed mines.So as you know the mines will not move when the enemy Tanks are near it when you set the allience with your opponent.Then the enemy will be in dangerous range so you must change the allience to the enemy position, so the mines will attack the rival Tanks immediatly and will damage the Tanks.

If you are a Zerg and playing in a different leveled map like Lost Temple not like the Hunters,you can divide the enemy forces easily by just morphing your Hydras into Lurkers in a correct time and place.How? The answer is so simple morph them at the entrance of the cliff but remember  some of the enemy forces must enter the high ground then you  seperate them with your high armored Lurker eggs easily and eridicate them seperately.