(;GM[1]FF[4]SZ[19]
GN[Seki]
PC[https://senseis.xmp.net/?GokyoSeimyoVolume3Problem27/Solution]AP[GoWiki:2009]
DT[2023-02-15]
C[Diagram from https://senseis.xmp.net/?GokyoSeimyoVolume3Problem27/Solution

Seki]
PL[B]

AB[oo][po][qo][ro][so][op][sp][nq][lr][nr][ms]
AW[pp][qp][rp][oq][sq][or][rr][ns][os]

;B[qr]C[B1]MN[1]
;W[pq]C[W2]MN[2]
;B[rs]C[B3]MN[3]
;W[sr]C[W4]MN[4]

;
)
