Xuanxuan Qijing Problem 66: White to play and make a ko
玄玄棋经 · Problem 66 of 347 · First-line tesuji
White's centre stones need to link up with the stones on the left, and every direct route is cut. Look for help from the first line.
How to solve it
White's stones in the centre are cut off and have to link up with the stones on the left. White starts with G18. Black cuts at G16, White plays F16 and Black plays F18.
White's G19 on the first line is the key move. If Black connects at E17, White plays F19, and after Black's E19, White's D19 makes a ko.
If Black plays H18 instead, White answers at E19. After Black's F19, White's E17 and Black's capture at E18, White plays D16 and connects out by capturing three black stones.
Main line
- 1. White G18
- 2. Black G16
- 3. White F16
- 4. Black F18
- 5. White G19
- 6. Black E17
- 7. White F19
- 8. Black E19
- 9. White D19
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.