Xuanxuan Qijing · Problem 15
Xuanxuan Qijing · Problem 15. Go, Black to play. Study 7 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. Black · D18
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 1 liberties: C18. Diagonal neighbours are not part of the same group. The resulting group is in atari.
2. White · C18
This move captures 1 stone. After captures, the connected group containing the new stone has 5 stones and 5 liberties: C19, B18, D18, A17, A16. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
3. Black · B19
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 3 liberties: B18, A19, C19. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
4. White · B18
This move captures 0 stones. After captures, the connected group containing the new stone has 6 stones and 5 liberties: A18, C19, D18, A17, A16. 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 · 8 black stones · 6 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 (7 plies)
Coordinates match this board: letters left to right, row numbers from top to bottom. These are board coordinates, not traditional score notation.
- Black
D18 - White
C18 - Black
B19 - White
B18 - Black
E19 - White
A16 - Black
A18