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Solution:
1.Qf3! (threat 2d4 mate)
1..Nxc5 2.Rg7! (this is the actual Plachutta threats 3Qg3 and 3Bc7)
2..Rgxg7 3.Bc7+ Rxc7 4.Qg3#
2..Rhxg7 3. Qg3+ Rxg3 4.Bc7#.
Solution:
1.Qf3! (threat 2d4 mate)
1..Nxc5 2.Rg7! (this is the actual Plachutta threats 3Qg3 and 3Bc7)
2..Rgxg7 3.Bc7+ Rxc7 4.Qg3#
2..Rhxg7 3. Qg3+ Rxg3 4.Bc7#.