(;GM[1]FF[4]SZ[19]
GN[Failure 1a]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem39/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem39/Solution

Failure 1a]
PL[W]

AB[mb][lc][qc][rc][md][nd][pd][qe][qg]
AW[qb][rb][nc][oc][pc]
LB[na:a][ob:b]

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

;LB[na:a][ob:b]
)
