(;GM[1]FF[4]SZ[19]
GN[How to continue this solution?]
PC[http://senseis.xmp.net/?KoreanProblemAcademy/Errata]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?KoreanProblemAcademy/Errata

How to continue this solution?]
PL[B]

AB[ma][na][mb][lc][nc][rc][nd][pd][rd][oe][pe][rf]
AW[ra][nb][ob][pb][rb][sb][oc][qc][od]

;B[qb]C[B1]MN[1]
;W[oa]C[W2]MN[2]
;B[qa]C[B3]MN[3]
;W[pc]C[W4]MN[4]

;
)
