Xuanxuan Qijing Problem 75: White to play and make a ko
玄玄棋经 · Problem 75 of 347 · Placement on the first line
Black's stones in the corner are only loosely connected. Start underneath them, on the first line, before Black can link everything up.
How to solve it
White begins with the placement at B19 on the first line. Black defends at B17 and White plays A16.
Black plays D17, White pushes at C16 and Black answers at C17. White then plays E19 and F19 along the first line, which Black answers at D19 and E17.
White's C19 completes the sequence, and the life of the corner is decided by a ko.
Main line
- 1. White B19
- 2. Black B17
- 3. White A16
- 4. Black D17
- 5. White C16
- 6. Black C17
- 7. White E19
- 8. Black D19
- 9. White F19
- 10. Black E17
- 11. White 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.