15 is the Caro-Kann, Main Line.
Fifteen pieces and a mate

5 is the Alapin.
No....
Well, I wouldn't know an Alapin if it bit me : (

The Alapin is e4 c5 c3.
The Alapin Variation of the Sicilian Defence, yes. The list specifies "Alapin's Opening."

3 is the KID bayonet, and 6 is the sicilian dragon (exchange sacrifice on c3).
Right again!

I get a mate in 5.
Qf, followed by h6. Black can only delay by sacrificing the rook and the queen, then mate on g7

I get a mate in 5.
Qf, followed by h6. Black can only delay by sacrificing the rook and the queen, then mate on g7
Excellent Rooperi, the shortest mate is in 5 moves.

I get a mate in 5.
Qf, followed by h6. Black can only delay by sacrificing the rook and the queen, then mate on g7
But I think it has to be 1. Qf6 Kg8 2. Bh6. If white plays 2. h6 black has 2. ... Rf8.

I get a mate in 5.
Qf, followed by h6. Black can only delay by sacrificing the rook and the queen, then mate on g7
But I think it has to be 1. Qf6 Kg8 2. Bh6. If white plays 2. h6 black has 2. ... Rf8.
2.Bh6 is followed by 2...Rc7 and the mate takes longer. The quickest mate is 1.Qf6+ Kg8 2.Qxe6+ etc.
5 is the Alapin.
No....