(;GM[1]FF[4]SZ[19]
GN[The ladder starts...]
PC[http://senseis.xmp.net/?LadderExercise4/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?LadderExercise4/Solution

The ladder starts...]
PL[B]

AB[fb][hb][jb][qb][bc][hc][jc][qc][cd][jd][kd][pd][be][de][je][pe][df][hf][jf][dg][jg][pg][rg][eh][hh][ih][oh][ej][ck][qk][bl][dl][ql][qm][pn][eo][fo][no][oo][po][dp][gp][hp][mp][qp][fq][nq][qq]
AW[ja][ib][kb][ob][cc][dc][kc][pc][dd][fd][ld][md][od][ee][ge][he][ke][nf][eg][fg][kg][fh][jh][gi][hi][ii][qi][rk][cl][rl][bm][cm][pm][rm][cn][nn][on][qn][go][lo][mo][qo][cp][fp][pp][rp][cq][er]

;B[om]C[B1]MN[1]
;W[pl]C[W2]MN[2]
;B[nm]C[B3]MN[3]
;W[mn]C[W4]MN[4]
;B[pk]C[B5]MN[5]
;W[ol]C[W6]MN[6]
;B[nl]C[B7]MN[7]
;W[ok]C[W8]MN[8]
;B[oj]C[B9]MN[9]
;W[nk]C[W10]MN[10]

;
)
