(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[https://senseis.xmp.net/?KyuExercise157/Solution]AP[GoWiki:2009]
DT[2023-02-21]
C[Diagram from https://senseis.xmp.net/?KyuExercise157/Solution

Black to play]
PL[B]

AB[nj][nk][pk][ll][pl][ql][nm][pm][kn][ln][mn][on][pn][qn][po][ro][op][oq][pq][nr][pr][ns]
AW[ni][oi][lj][mj][oj][qj][kk][qk][rl][jm][km][qm][rm][jn][nn][rn][ko][lo][mo][no][oo][qo][pp][qp][jq][mq][nq][qq][mr]

;B[lm]C[B1]MN[1]
;W[ml]C[W2]MN[2]
;B[mk]C[B3]MN[3]
;W[ol]C[W4]MN[4]
;B[ok]C[B5]MN[5]
;W[nl]C[W6]MN[6]
;B[lk]C[B7]MN[7]

;
)
