Ladder puzzle 1/Solution

Correct: e5

Red's main threat is the ladder starting at c7. If Red plays out this ladder, Blue can block it. So Red needs a helping stone somewhere on the right and on the second line from the bottom. R1 threatens the follow-up moves at *, which Blue must defend.

Red continues that way, using the stone at the right. Again, Blue has to defend.

Finally, Red plays a double threat. This stone is the ladder helper, and it also threatens to connect along the top.

Alternative Solution: f6

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

Now Red pushes to the right, making both f4 and f6 winning points. Blue cannot defend both.