This one requires you to see what White’s difficulty is and how to solve it.
A study by Berger. The knight has to both vacate c7 to threaten the pawn advance and be able to fork the king and bishop if Black tries to defend. 1.c5 Bb1 2.Ne6 2.c6 Be4 2...fxe6 2...Be4 3.Ng5+ Kf4 4.Nxe4 Kxe4 5.c6 3.c6 Be4 4.c7
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