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

Mistake]
PL[B]

AB[ob][qb][kc][oc][qc][rc][ld][md][od][pd][rd][of]
AW[oa][pa][jb][kb][nb][pb][jc][mc][pc][qd][qe][qf][qh]
LB[la:a]

;B[lb]C[B1]MN[1]
;W[na]C[W2]MN[2]
;B[ma]C[B3]MN[3]
;W[mb]C[W4]MN[4]

;LB[la:a]
)
