(;GM[1]FF[4]SZ[19]
GN[Can black capture the white stone in a ladder?]
PC[http://senseis.xmp.net/?LadderExercise4b/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?LadderExercise4b/Attempts

Can black capture the white stone in a ladder?]
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[kh]C[W2]MN[2]
;B[pl]C[B3]MN[3]
;W[ie]C[W4]MN[4]

;
)
