Beginner Exercise 193 / Solution

Sub-page of BeginnerExercise193
Analysis

Before presenting the solution proper, it is worth nothing that aims at in this diagram. This is going to spell trouble for Black, the result is at least a favourable ko for White. So Black at a definitely is not going to be a solution.

Failure

However, playing directly at is also wrong. While it is not possible for White to approach at a, White can play at . If blocks, White can start a ko with .

Failure

If makes an eye here, then White has successfully made a seki in sente within Black's territory.

Bill: When White can win the ko, Black will avoid it with .

Failure

Actually, if White wants to avoid a ko at all costs, it is still possible to create a seki with and . But this seki is gote for White, and also White loses points due to sacrifice of and .

Bill: Late in the game (where this position is likely to arise), this is the way for White to play if Black can win the ko.

Failure

If , then White has the option of playing for a peaceful seki or to start a ko at a. Or can just play elsewhere.

Solution

By now, it should be clear that is the only solution. See that White a means self-atari.

Solution

If , then can play elsewhere.

Solution

tries to bluff Black into thinking there is a ko. shows that with a connect-and-die, there isn't any ko.

NecRock?: Would it be a good idea for Black to take the ko anyway, once, to make White waste a threat?

unkx80: Not necessary a good idea. White can just play elsewhere, and then locally White has one more ko threat than before.

Eaglehelm: Not even a ko. The move captures two stones.

Beginner Exercise 193 / Solution last edited by Eaglehelm on December 26, 2009 - 02:03
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