Xuanxuan Qijing · Problem 9
Xuanxuan Qijing · Problem 9. Go, White to play. Study 13 reference plies, try both sides and branch from the replay.
Site coordinates run A–S left to right and 1–19 top to bottom; A1 is the top-left intersection.
Read the position, one decision at a time
Try the position first, then open the notes. They explain measurable changes in the reference, not every possible variation.
Reveal step-by-step explanations
1. White · F19
This move captures 0 stones. After captures, the connected group containing the new stone has 5 stones and 1 liberties: D19. Diagonal neighbours are not part of the same group. The resulting group is in atari.
2. Black · A15
This move captures 0 stones. After captures, the connected group containing the new stone has 3 stones and 3 liberties: B16, A13, B14. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
3. White · A12
This move captures 0 stones. After captures, the connected group containing the new stone has 3 stones and 3 liberties: A11, A13, B14. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
4. Black · B14
This move captures 0 stones. After captures, the connected group containing the new stone has 4 stones and 2 liberties: A13, B16. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
Understand this position
19 ranks × 19 files · 20 black stones · 25 white stones
Count the liberties of each connected group, not the empty points next to just one stone. Orthogonal contact connects; diagonal contact does not. Try your move, count captures and recount the resulting group’s liberties before comparing the reference.
Read the reference line (13 plies)
Coordinates match this board: letters left to right, row numbers from top to bottom. These are board coordinates, not traditional score notation.
- White
F19 - Black
A15 - White
A12 - Black
B14 - White
B16 - Black
A11 - White
A13 - Black
A15 - White
B19 - Black
B14 - White
A16 - Black
A14 - White
B13