(;GM[1]FF[4]SZ[19]
GN[Failure 3a: ko]
PC[http://senseis.xmp.net/?GokyoShumyoSection2Problem1/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection2Problem1/Solution

Failure 3a: ko]
PL[W]

AB[oa][pb][nc][oc][pc][qc][rc][rd]
AW[mb][nb][ob][mc][nd][od][pd][qd][re][qf]

;W[qa]C[W1]MN[1]
;B[ra]C[B2]MN[2]
;W[rb]C[W3]MN[3]
;B[sb]C[B4]MN[4]

;
)
