(;GM[1]FF[4]SZ[19]
GN[Solution: ko]
PC[https://senseis.xmp.net/?GokyoSeimyoVolume3Problem19/Solution]AP[GoWiki:2009]
DT[2023-02-15]
C[Diagram from https://senseis.xmp.net/?GokyoSeimyoVolume3Problem19/Solution

Solution: ko]
PL[B]

AB[qk][rl][sl][pm][qm][sm][pn][oo][op][pq][or][qr][rs]
AW[rm][qn][rn][sn][po][pp][qp][qq][rr][sr]

;B[rp]C[B1]MN[1]
;W[rq]C[W2]MN[2]
;B[so]C[B3]MN[3]
;W[sp]C[W4]MN[4]

;
)
