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SOLUTION

PUZZLE #4

White: 5 pieces (Ka8, Wd6, Nf6, Cg8, Pd5)
Black: 1 piece (Kd9)
White to move and mate in three.

The challenge in this problem is more for the composer than for the solver: to create a puzzle which leads to pure mates.
1.Cf8 Kc8, 2.Ng8 Kd7, 3.Ne9# (or 2...Kd9, 3.Ne7)