# Beginner Exercise 266 / Solution

Sub-page of BeginnerExercise266

Reason: this problem is already not easy and the solution involves too many calculations to make it a beginner problem. Just living is fine in itself.

Main Diagram

First, let's try all the moves including tenuki.

Tenuki doesn't work ( at )

'e' in the Main Diagram is the same.

'a' doesn't work

After , it doesn't matter black captures with 'x' or 'y', white can throw in and black has no eye in the corner. If black plays at , white plays 'x'.

'c' doesn't work
'd' doesn't work

## Comparison

Two option left, let's see which one is better.

'f' ( at )

White probably wouldn't play and right away, but it's sente for white, so it's reasonable to assume white would get them. Ko threat wise, white has ,, and 'm' before the end game. Points: 5 Ko threats: 3

'b'

Notice black has to capture with 'w' later, so it's one point less than it looks. Also, if we assume the outside is going to be white's territory, then it's another one point less than it looks. The reason is: black won't get all three of 'x','y', and 'z', because the last one is going to be gote for black and sente for white. Ko threat wise, there's another ko threat before the end game at 'n' besides . After that, there's another two-point losing threat at 'v'.

Points: 9-2 = 7 Ko threats: 2 + 1 two-point-losing threat

## Verdict

Only 'f' and 'b' saves black, and 'b' is the best. 'b' is about 2 points better.

Beginner Exercise 266 / Solution last edited by Dieter on July 29, 2014 - 11:06
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