By the way , I dont like gameknot site bcoz i cant see the diagram at my mobile! Next time use jpg file please.
Sorry im posting use my mobile, how to make a manual spoiler tag?
100% Correct Solution
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1.g3! any Bishop move
2 Nf3# (or may be Nf5# or Ne6#)
1.g3! Na4
2.Nf3+ Bxf3
3.Nf5+ Ke4
4. d3#
1.g3! Nc4
2. Qxc4+ Ke5
3. Nge4 any
4. d4#
1.g3! Nd1
2.Nf3+ Bxf3
3.Nf5+ Ke4
4. d3#
1.g3! Nd3
2.Nf5+ Bxf5
3.Nf3+ Ke4
4. Qc6#