3 Defenders is not the cause of this.

3 WIDE defenders might have contributed to this "SHOCK" loss. If they had been 3 DC narrow, I might have said this was a troll, but why put 2 wide defenders if the opponent is going with a narrow diamond up the middle?

His 3-4-1-2 should have been sufficient to win, had he had the 3 DC narrow as it is close to the 3N-1-4-2 that I use all the time vs narrow diamond. The offense itself keeps the opponent on the defensive...except in this case.