Ladder puzzle 1/Solution

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Correct: e5

abcdefgh1234567813245

Wrong: f6

abcdefgh1234567812

The stone at f6 is a ladder breaker for the ladder starting at c7, and it also threatens to connect via f5. This looks very strong, but Blue can still defend at e7, which is a ladder breaker and threatens a connection at the lower side. Since Blue has another threat at e5, this is enough for winning.