Xuanxuan Qijing · Problem 28
Xuanxuan Qijing · Problem 28. Go, Black to play. Study 3 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 · R1
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 3 liberties: R2, Q1, S1. 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 · Q4
This move captures 0 stones. After captures, the connected group containing the new stone has 3 stones and 3 liberties: R3, Q1, R2. 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 · S2
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 3 liberties: S1, S3, R2. 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 · 12 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 (3 plies)
Coordinates match this board: letters left to right, row numbers from top to bottom. These are board coordinates, not traditional score notation.
- Black
R1 - White
Q4 - Black
S2