Beginner Exercise 87 / Solution

Sub-page of BeginnerExercise87
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Solution

The jump to the 1-2 point is the only move.

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Solution

This sequence is the best result for both players, and hence regarded as the main line.

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Solution

If W2 pushes in, then B3 captures and White only loses stones due to connect-and-die. Note that the capture of white+circle gains Black a liberty, so after B3 Black is not under atari.

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Solution

If W2 plays at the other 1-2 point, then B3 cuts and captures everything. Even when White connects at a, then Black is still alive with the bent four living eye space.


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Main failure

The main failure sequence is to atari at B1, hoping White will connect and then we revert back to the solution main line. But no, with W2 Black can only live by winning the ko.

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Main failure variation

An interesting variation from the main failure sequence is this B3 and is worth discussing. It tries to combine two techniques: snapback and connect-and-die. Obviously White cannot connect at a...

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Main failure variation

However, W4 can choose to capture. Black can continue fighting the ko with a, or...

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Main failure variation

Black can also capture the two White stones...

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Main failure variation

However, this is not a typical snapback, but rather a case of capture two, recapture one. After W6 the only way for Black to continue is to fight the ko at a.

While this variation sequence does not allow Black to avoid fighting a ko, however it does provide Black with two local ko-threats, namely, B3 and B5.


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Failure

Another failure is to play at B1. Then W2 kills.



This is a copy of the living page "Beginner Exercise 87 / Solution" at Sensei's Library.
(OC) 2016 the Authors, published under the OpenContent License V1.0.
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