White to move and Win(A beautiful study by master composer Troitsky)

A beautiful study by Troitsky (Greatest composer ever?)
White to move and win
Can you find the winning move and winning idea?
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Credit-I found this study in the book, Collection of Chess Studies.
You can buy it here
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How do I post the image of the board? I am not able to post the image of the board here. You can view it here.
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