Xuanxuan Qijing · Problem 27
Xuanxuan Qijing · Problem 27. Go, Black to play. Study 11 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 · D19
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 3 liberties: D18, C19, E19. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
2. White · C19
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: C18, B19. 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 · C18
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: C17, D18. 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 · B19
This move captures 0 stones. After captures, the connected group containing the new stone has 3 stones and 3 liberties: A19, B17, A18. 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 · 11 black stones · 7 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 (11 plies)
Coordinates match this board: letters left to right, row numbers from top to bottom. These are board coordinates, not traditional score notation.
- Black
D19 - White
C19 - Black
C18 - White
B19 - Black
A16 - White
A15 - Black
B17 - White
C17 - Black
A18 - White
D18 - Black
E19