Beginner Exercise 235 / Solution

Sub-page of BeginnerExercise235

Black is alive as it stands. The best White can get is an endgame gain - 6 points in sente.

[Diagram]

Outside attack

If W1, B2 makes W3 and B4 miai, so Black lives. (B2 at W3 is killed by W3 at B2.) For White, this is a 5 point endgame play in sente (White has got an extra point at a).

(For advanced readers: this line may be preferable in the middlegame - White's outside wall has an additional eye at a, fewer cutting points, b connect in sente, and no worries about seki collapse. In a word, thick.)

[Diagram]

Inside attack: seki 1

After W1 and W3, Black has a choice between two sekis. One way to make seki is B4 and B6 in the diagram. For White, this is a 6 point endgame play in sente but a cutting point appears at a.

[Diagram]

Inside attack: seki 2

The other way is B4 and B6 in this diagram. In this case, Black is emphasizing the cutting point at b.

[Diagram]

Comparison: Black first

(For advanced readers: If Black to play, B1 secures 6 points of territory - a and b are miai for life and c and d are miai to save 1 point. This is a 6 point endgame play in reverse sente.)



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