12 1. Ne7
If 1 ... Q x N
if 2 ... RxQ
3. Re8 mate
if R x e1 capture Q with check
if queen moves Ne7 forking king and rook
if queen captures knight, capture rook with queen
1. N x d5 penetrate 7th rank with rook.
1. nf7 ch
wins a rook because if bishop takes knight, queen takes knight
after rook takes knight pawn takes knight, rook takes bishop still threatened
16 nf4 intending n xd5
18 nd7 wins piece
Got 5 right. Missed Queen penetration in 14. Missed queen pin after rXn in 16.
I think I'll play some trainingbot.