(;GM[1]FF[4]SZ[19]
GN[Ladder exercise]
PC[http://senseis.xmp.net/?LadderExercise3]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?LadderExercise3

Ladder exercise]
PL[W]

AB[lc][mc][oc][dd][nd][pd][me][cl][em][do][dp][op][qp][rp][dq][jq][pq]
AW[nb][ob][pb][nc][qc][md][qf][pj][pm][cn][co][po][qo][cp][cq][mq]

;W[ek]C[W1]MN[1]
;B[el]C[B2]MN[2]
;W[ld]C[W3]MN[3]

;
)
