Xuanxuan Qijing · Problem 11
Xuanxuan Qijing · Problem 11. Go, Black to play. Study 5 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 · P19
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: O19, Q19. 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 · O18
This move captures 0 stones. After captures, the connected group containing the new stone has 2 stones and 3 liberties: O19, N18, Q18. 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 · N18
This move captures 0 stones. After captures, the connected group containing the new stone has 4 stones and 7 liberties: N19, M18, N16, M17, O16, P16, Q17. 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 · O19
This move captures 0 stones. After captures, the connected group containing the new stone has 3 stones and 2 liberties: N19, Q18. 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 · 6 black stones · 5 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 (5 plies)
Coordinates match this board: letters left to right, row numbers from top to bottom. These are board coordinates, not traditional score notation.
- Black
P19 - White
O18 - Black
N18 - White
O19 - Black
Q18