Xuanxuan Qijing Problem 70: Black to play and live
玄玄棋经 · Problem 70 of 347 · Descent to the first line
The capture in the corner is tempting, but it leads to a ko. Is there a calmer move that makes the eye space wide enough?
How to solve it
Black's group needs a second eye in the corner. The quiet descent to C19 on the first line lives.
Capturing at A18 looks natural, but White answers at B19 and the result is a ko.
Playing B18 does not work either: White takes the key point at C19.
Main line
- 1. Black C19
Solution checked against Sensei's Library.
Play it out on the board
Place the stones yourself and see the refutation when you miss. All the Xuanxuan Qijing problems as quick lessons.