This was posted in the 'Puzzles & Posers' think it should get an airing here.
White to play and mate in 12 moves.
Just click play and enoy it. It's all forced.
Composed by O.T. Bláthy.
Don't you just wish you could produce something like this
[FEN "8/1nq5/bppp4/1p1k1K1N/1rrp3b/2pp2p1/8/n7 w - - 0 1"]
[SetUp "1"]
{--------------
. . . . . . . .
. n q . . . . .
b p p p . . . .
. p . k . K . N
. r r p . . . b
. . p p . . p .
. . . . . . . .
n . . . . . . .
white to play
--------------}
1. Nf4+ Kc5 2. Ne6+ Kd5 3. Nxc7+ Kc5 4. Nxa6+ Kd5 5. Nc7+ Kc5 6. Ne6+ Kd5
7. Nf4+ Kc5 8. Ke4 d5+ 9. Ke5 Bf6+ 10. Ke6 Nd8+ 11. Kd7 Rb1 12. Nxd3