(;GM[1]FF[4]SZ[19]
GN[if Black A; outcome Balanced]
PC[http://senseis.xmp.net/?BigoProblems/solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BigoProblems/solution

if Black A; outcome Balanced]
PL[B]

AB[fc][nc][cd][qd][be][de][dg][qh][cj][ql][bm][an][cn][bo][qo][cp][qp][cq][nq][pq][qq]
AW[bc][cc][gc][hc][dd][ed][fd][qj][pl][pn][qn][co][do][po][bp][dp][pp][bq][dq][gq]

;B[rl]C[B1]MN[1]
;W[pk]C[W2]MN[2]
;B[rn]C[B3]MN[3]
;W[mo]C[W4]MN[4]

;
)
