Xuanxuan Qijing · Problem 21
Xuanxuan Qijing · Problem 21. Go, White 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. White · A14
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: A13, A15. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
2. Black · C16
This move captures 0 stones. After captures, the connected group containing the new stone has 4 stones and 3 liberties: C17, B16, A15. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
3. White · A15
This move captures 0 stones. After captures, the connected group containing the new stone has 2 stones and 2 liberties: A16, A13. Diagonal neighbours are not part of the same group. More than one liberty does not by itself establish life; examine the next move.
4. Black · A16
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 2 liberties: A17, B16. 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 · 5 black stones · 9 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.
- White
A14 - Black
C16 - White
A15 - Black
A16 - White
C17 - Black
A13 - White
B17