Xuanxuan Qijing · Problem 39
Xuanxuan Qijing · Problem 39. 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 · M1
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 3 liberties: M2, L1, N1. 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 · N2
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: N1, M2. 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 · O4
This move captures 1 stone. After captures, the connected group containing the new stone has 4 stones and 6 liberties: O3, N5, M4, M3, O6, P5. 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 · R3
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 3 liberties: R2, R4, S3. 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 · 21 black stones · 17 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
M1 - White
N2 - Black
O4 - White
R3 - Black
J2 - White
M2 - Black
K2