(;GM[1]FF[4]SZ[19]
GN[Black to move]
PC[https://senseis.xmp.net/?GokyoSeimyoVolume3Problem7/Solution]AP[GoWiki:2009]
DT[2023-02-14]
C[Diagram from https://senseis.xmp.net/?GokyoSeimyoVolume3Problem7/Solution

Black to move]
PL[B]

AB[rk][pl][ql][sl][pm][on][oo][op][oq][pq][qq]
AW[rl][qm][rm][sm][pn][po][pp][qp][rq][qr][rr]

;B[qn]C[B1]MN[1]
;W[rn]C[W2]MN[2]
;B[rp]C[B3]MN[3]
;W[qo]C[W4]MN[4]
;B[ro]C[B5]MN[5]

;
)
