Xuanxuan Qijing · Problem 26
Xuanxuan Qijing · Problem 26. 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 · R18
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: R19, S18. 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 · S18
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: S17, S19. 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 · R19
This move captures 0 stones. After captures, the connected group containing the new stone has 2 stones and 1 liberties: S19. Diagonal neighbours are not part of the same group. The resulting group is in atari.
4. White · S19
This move captures 2 stones. After captures, the connected group containing the new stone has 2 stones and 3 liberties: R19, S17, R18. 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 (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
R18 - White
S18 - Black
R19 - White
S19 - Black
S16 - White
O18 - Black
P18 - White
P19 - Black
S17 - White
N19 - Black
R18