(;GM[1]FF[4]SZ[19]
GN[If Black makes an eye in the corner]
PC[http://senseis.xmp.net/?RTGProblem7/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?RTGProblem7/Solution

If Black makes an eye in the corner]
PL[B]

AB[pn][qn][oo][qo][pp][qp][rp][oq][rq][or][rr][sr]
AW[nl][pl][rl][mm][pm][rm][nn][rn][so][np][op][sp][lq][nq][sq][nr][qr][ps]

;B[rs]C[B1]MN[1]
;W[on]C[W2]MN[2]
;B[os]C[B3]MN[3]
;W[pq]C[W4]MN[4]
;B[qq]C[B5]MN[5]
;W[ns]C[W6]MN[6]

;
)
