Go Puzzle Sheet #17.1

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Ko fights


. . . O . 1 # # .
. . O . O # . # .
. . O . O O # # #
. . . O . O O O #
O O O O O . . . O
# # # . . C O O A
. . # . # # # # B
. # # # . . # . .
. # . # . . # . .

White played 1, taking a stone. Should Black play A, B or C?


. # O . . . O # .
. # O O . O O # 2
. . # # O . O # .
. # . # O . O # .
. . # # O . O # #
. . . # O . . O O
. . . # # O . O .
. . # # O . O . .
. . # . 1 O . . .

Black took at 1; then White played at 2. Where does Black play now?


. # 1 . O . O . .
# . # O . O . O O
O # # . O . O . .
O O O O O O . 2 .
O O # # # # O O O
. O # . # . # # #
O . O # . . # . .
O O O # # # . # .
. # # # . . . . .

White took at 1; then Black played at 2. Where does White play now?


. . . # . . . . .
. . . # . . . # .
. . . # # # # . .
# # # O O . O # #
O O O O , O O O O
. . . . O . . . .
. O O O . O O O .
. O # # . # # O .
. O # . # . # O .

Where should White play to start a ko, and why?


. . . . # # # O .
. . . # . # O O .
. . # . # O . . .
. . . # # O . O .
. . . . # O . . .
. # . # O O . . .
. . . # O . O . .
. . # . 1 O O . .
. . . # O . . . .

Black just captured at 1. Find a ko threat for White.


1 O O . . . . . .
. # O O . . . O .
# # # O O . O . O
. . . # O # O O #
. . # # O O # # #
. . # . O # . . .
. . # . O # # # .
# # # O O # O O .
. O O O # # # . .

Black just captured at 1. Find a ko threat for White.

This page gives some of the problems from Paul Smith's "Cambridge Go Puzzle Book". Some other pages are listed here [5].

It is part of the British Go Association web site [6].