A dandy little study by Troitzky from 1917. You would think he had other things on his mind that year! It’s really process of elimination. All the wrong choices just draw very easily.
1.Kc6 cxb6 [1...axb6 2.c4 b5 3.cxb5 Ka7 4.b6+ (4.Kxc7 stalemate.) 4...cxb6 5.Kc7] 2.c4 b5 3.cxb5 a5 4.bxa6 Ka7 5.Kc7 Kxa6 6.b8=Q and mates soon.