Xuanxuan Qijing · Problem 42
Xuanxuan Qijing · Problem 42. Go, White 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. White · L1
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 1 liberties: M1. Diagonal neighbours are not part of the same group. The resulting group is in atari.
2. Black · M1
This move captures 1 stone. 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.
3. White · M3
This move captures 0 stones. After captures, the connected group containing the new stone has 1 stones and 3 liberties: M2, M4, N3. 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 · O4
This move captures 0 stones. After captures, the connected group containing the new stone has 6 stones and 8 liberties: N4, N6, M4, M6, N3, P3, O1, N2. 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 · 10 black stones · 13 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.
- White
L1 - Black
M1 - White
M3 - Black
O4 - White
M4 - Black
O1 - White
M2 - Black
L1 - White
N1 - Black
N2 - White
J1