(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[13]KM[0.50]PW[White]PB[Black](;AW[bj][cj][ak][bl][cl][el][em]AB[ch][eh][ai][bi][di][aj][dk][ek][fk][fl][fm];B[cm];W[dl];B[bm];W[ck];B[al]C[one-step ko(B takes liberty after W connects b3)])(;AW[fb][hb][ib][jb][lb][gc][fd][jd][kd][fe][ff][jf][hg][jg][lg][kh]AB[kb][hc][ic][jc][kc][gd][id][ge][ie][if];B[le];W[ke];B[la];W[ld];B[lc])(;AW[cf][bg][fg][hg][jg][ch][dh][ji][ej][fj][gj][ck][ek][gk][jk][cl][fl][jl][bm][gm]AB[ah][bh][di][ei][fi][gi][hi][bj][cj][dj][hj][bk][hk][bl][gl][hl][il];B[em];W[fm];B[cm];W[dm];B[dl];W[dk];B[cm]C[ko (with W's group at stake)])(;AW[gf][eg][ig][eh][ih][fi][hi][dj][ej][fj][ij][jj][ek][gk][ik][el][il][jl]AB[fh][gh][hh][ci][di][ei][ii][ji][ki][cj][kj][bk][dk][jk][lk][cl][dl][kl][ll][em][im][jm];B[gi];W[hj];B[gj];W[gl];B[fl];W[fk];B[hl];W[kk];B[gm]C[double-ko death];W[fm];B[jk])(;AW[kf][hg][ig][jg][fh][kh][gi][ki][ej][fj][ek][gk][lk][ll]AB[ih][jh][gj][hj][ij][jj][fk][kk][kl];B[fl];W[gl];B[hl];W[fm];B[hk];W[el](;B[jl];W[km];B[ik];W[im];B[hm];W[jm];B[lm];W[mm];B[il])(;B[il]C[wrong side];W[hm]))(;AW[gg][hg][kg][fh][jh][ei][ki][ej][ij][kj][ek][ik][kk][el][hl][ll][ml]AB[gh][hi][ii][ji][jj][jk][il][jl][kl][jm][lm]C[(put at least 5 moves)];B[gl];W[gk];B[hk];W[hm](;B[gm];W[hj];B[gj];W[fl];B[hk];W[fm];B[ij])(;B[gj]C[there is a trap];W[gm]))(;AW[gg][hg][ig][kg][jh][kh][fi][fj][hj][fk][lk][gl][hl][il][jl][kl][lm]AB[hh][ih][gi][ii][gj][gk][hk][ik][jk][kk][ll][ml][km];B[li];W[mk];B[lj];W[mm];B[mj];W[ll];B[lh];W[lg];B[mh])(;AW[hh][jh][kh][gi][li][ej][fj][lj][dk][gk][hk][jk][lk][dl][gl][il]AB[gj][hj][ij][jj][kj][fk][ik][fl][fm];B[kl];W[kk];B[jl];W[ll];B[hl];W[hm];B[gm];W[hl];B[im];W[hl];B[hk];W[gl];B[km])(;AW[fg][gg][ig][kg][kh][fi][li][ej][ij][ek][hk][ik][jk][el][fl][il][jm]AB[hi][ii][ji][hj][jj][lj][fk][kk][jl][kl];B[hm](;W[gk];B[ml];W[lm];B[ll])(;W[im];B[ml];W[lm];B[km]))(;AW[gh][gi][ii][ki][hj][jj][kj][hk][gl][hl][jl][kl]AB[jf][fg][gg][ig][kg][fh][kh][fi][li][lj][ek][gk][kk][mk][fl][ll][fm][gm][lm];B[ik];W[jk];B[hm];W[im];B[il];W[ij];B[il];W[km];B[jm]C[ko]))