White to play and mate in 10 (easy)
 ← 
 → 
1.a8=N d3 2.Nb6 cxb6 3.c7 b5 4.c8=N b4 5.Nd6 exd6 6.e7 d5 7.e8=N d4 8.Nf6 gxf6 9.g7 f5 10.g8=N# 1-0
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[FEN "7K/P1p1p1p1/2P1P1Pk/6pP/3p2P1/1P6/3P4/8 w - - 0 1"]
[SetUp "1"]

1.a8=N d3 2.Nb6 cxb6 3.c7 b5 4.c8=N b4 5.Nd6 exd6 6.e7 d5 7.e8=N d4 8.Nf6
gxf6 9.g7 f5 10.g8=N# 1-0