Welcome to the world of chess.com! Chess.com will never play a puzzle move which leaves you choice on how to achieve your goal. On .c5 black can reply with either ..Kf5 or ..Kf7, after .Kf3 black can only play ..a4!
Why this problem is solved in that way?
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https://www.chess.com/puzzles/problem/1286061
Nxc4 is clear, but i don't understand why white moves the K instead racing me for promoting the c4 pawn. Someone can explain me? Thank you