(;GM[1]FF[4]SZ[19]
GN[Mistake at 1]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem20/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem20/Solution

Mistake at 1]
PL[B]

AB[bq][cq][dq][eq][er]
AW[co][bp][dp][ep][fq][hq][br][fr]

;B[aq]C[B1]MN[1]

;
)
