KyuExercise53/Solution

Minimum eyespace  

The marked region is the minimum eyespace after reduction.

Independent miai plays  

There are five independent miai: The three pairs a&b to e&f each are miai for closing off. g and h are miai for connection. The are miai for two eyes.

White play at i with having a white stone at d makes the non-miai, but this can be answered by playing one of the . Because of this i and h are not generally miai.

None of the possible resulting Black groups is in atari. And none can be raced.

So Black cannot be killed, no ko and no seki are forcible against Black.

What remains is the question of best play(s). The miai plays are not necessarily the best ones.