(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[]PB[Black to Play]C[Just play through the moves to move 18 which is the problem
position. These do not represent a game sequence!]
;B[qr]
;W[pr]
;B[sr]
;W[pq]
;B[qs]
;W[pp]
;B[qp]
;W[po]
;B[rp]
;W[sp]
;B[so]
;W[ro]
;B[]
;W[rn]
;B[]
;W[pm]
;B[]
;W[nr]C[This is the problem position. Black to play.]
)