Your pawn stakes the very center and opens lines for your own bishop and queen; the fight for the middle starts even, move one.

Instead of guarding your pawn you attack his; the symmetrical-looking move is an invitation to the sharpest trap set in your repertoire.

If White takes on c6, you recapture with the d-pawn and unleash your pieces.

Open the d-file and the c8-h3 diagonal.

If White pins your knight with the bishop to g5, you spring the trap by grabbing the e4 pawn with the knight.

Take the queen and they're mated. Decline and they lose the queen.

King forced to the square the second bishop needs.

Every square around the king covered.