(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.00] PW[White]PB[Black]AW[pc][qd][qe][co][fq]AB[pd][dp][eq]LB[nc:B][od:A]C[Does A work? If yes, play it, else play B.]PL[W] (;W[nc]CR[nc]C[RIGHT Correct. The ladder doesn't work.]) (;W[od]CR[od] ;B[pe]CR[pe] ;W[pf]CR[pf] ;B[oe]CR[oe] ;W[ne]CR[ne] ;B[of]CR[of] ;W[og]CR[og] ;B[nf]CR[nf] ;W[mf]CR[mf] ;B[ng]CR[ng] ;W[nh]CR[nh] ;B[mg]CR[mg] ;W[lg]CR[lg] ;B[mh]CR[mh] ;W[mi]CR[mi] ;B[lh]CR[lh] ;W[kh]CR[kh] ;B[li]CR[li] ;W[lj]CR[lj] ;B[ki]CR[ki] ;W[ji]CR[ji] ;B[kj]CR[kj] ;W[kk]CR[kk] ;B[jj]CR[jj] ;W[ij]CR[ij] ;B[jk]CR[jk] ;W[jl]CR[jl] ;B[ik]CR[ik] ;W[hk]CR[hk] ;B[il]CR[il] ;W[im]CR[im] ;B[hl]CR[hl] ;W[gl]CR[gl] ;B[hm]CR[hm] ;W[hn]CR[hn] ;B[gm]CR[gm] ;W[fm]CR[fm] ;B[gn]CR[gn] ;W[go]CR[go] ;B[fn]CR[fn] ;W[en]CR[en] ;B[fo]CR[fo] (;W[fp]CR[fp] ;B[eo]CR[eo] (;W[do]CR[do] ;B[ep]CR[ep]C[Black has three liberties = Failure]) (;W[ep]CR[ep] ;B[do]CR[do]C[Black has three liberties = Failure])) (;W[eo]CR[eo] ;B[fp]CR[fp] (;W[gp]CR[gp] ;B[ep]CR[ep]C[Black has four liberties = Failure]) (;W[ep]CR[ep] ;B[gp]CR[gp] ;W[hp]CR[hp] ;B[ho]CR[ho] ;W[gq]CR[gq] ;B[in]CR[in]))))