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If 2...,Ng6 then 3.FxG6. if 2...,Rxh2 then#.

Tactics training should help the player to improve his/her practical play through strengthening tactical ability. Mate in 3 wins just as surely as mate in 2, but penalizing mate in 3 by reducing the player's tactical rating is counterproductive.

Instead of just quoting the rules rigidly, it would be better to make exercises that are unambiguous. Please be aware that I saw the mate in 3 in less than 1 second. Naturally I assumed that it was the solution, and a person in that situation doesn't necessarily even look to read if the solution is 2 moves or 3. Besides, the double knight sac is more aesthetically interesting.

Regardless of what the rules state, my goal is to improve my play overall, not just to find the absolute quickest win. In fact, in an over-the-board tournament that is rated, I might even prefer a line that wins the opponent's queen (or some other massive material gain) OVER a line that checkmates in x moves, simply because the lesser line leads to an easier win in which I don't have to worry about overlooking a trick by my opponent.

Sorry for the lengthy reply. I hope that clarifies what I am trying to say.

I thought I was! I assumed that commenting on the tactical exercises was read by the administrator; didn't realize that it was for the author.