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Capturing Race Exercise 18 / Attempts
Sub-page of CapturingRaceExercise18
Hans: If white starts she can win. 1. White first:
MikeTerry: Capturing the enemy stones in your eye space earlier than you need to is often a mistake. Here,
capturing with
White wins by one move.
Suggestion: concentrating on the Black first situation will help clarify the White first situation... I should add here that this is a position I have made up and analysed myself, and I've been known to produce total gibberish analyses in the past! So I apologise to everyone in advance if I'm doing it again :) Black first??? unkx80: Hmm, difficult problem. The conventional way of reducing it to rabbity six doesn't seem to work.
The extra liberty at a allows White to play at
So Black must fill all the shared liberties before completing the rectangular-six shape, as in Unkx80's latest attempt somewhere below.
This is a ko.
More analysis later...
unkx80: More analysis, as promised. To answer the
MikeTerry:
When do we fight this ko?
This is an approach ko. unkx80: Try again...
Back to the throw-in ko. MikeTerry: Right! This is the best sequence I've found, and leads to a direct ko. White will proceed to fill the Black eye liberties on the right, forcing Black to start the ko, and so Black will have to make the first ko-threat.
That leaves us with the White-first situation to sort out, which follows similar ideas to those above, but has it's own peculiar feature to be discovered! :)
Bill: Just a small comment about local ko threats.
This is a copy of the living page "Capturing Race Exercise 18 / Attempts" at Sensei's Library. ![]() |