(;AB[bb][bd][bi][ca][cc][cd][ch][ci][cj][cl][cm][cp][cr][dc][dg][dk][dp][dr][eb][ec][ed][ee][ef][eg][eh][ei][ek][el][em][eq][fa][fc][fi][fk][fn][fq][gb][gi][gl][gn][gp][gr][hd][he][hf][hg][hi][ho][hq][ib][ic][ie][il][in][ip][ir][jg][jh][ji][jm][jr][kc][ke][kf][ki][kk][kn][lb][ld][le][lj][lk][ll][lm][lo][me][mn][mp][ne][np][nq][ns][od][oe][of][og][ok][oq][or][os][pj][pk][pl][pm][pn][pq][qd][qe][qi][qk][re][rf][rg][rh][rj][si] AW[ab][ac][ad][af][ag][ai][bc][bf][bh][bk][bm][bp][br][ce][cf][cg][ck][co][cq][dd][de][dh][di][dj][dl][dm][dn][do][ej][eo][fe][ff][fg][fh][fj][fl][fo][gc][gd][gj][hb][hc][hj][id][if][ij][jb][jc][jd][je][jf][jj][jn][jo][jp][jq][kd][kg][kh][kj][ko][kq][kr][lc][lf][li][lp][lr][mb][mc][md][mf][mh][mj][mk][mq][mr][nc][nd][nk][nm][nn][nr][oc][oi][oj][ol][on][oo][op][pc][pf][ph][pi][ps][qc][qf][qg][qh][qq][rb][rd][sc] LB[yy:1][yy:0][yy:0]TR[qq]PL[B] C[White tried the marked move. How to respond?] (;B[qo] MN[1] ;W[qr] ;B[rp] C[RIGHT These are the only moves that kill White, while retaining the lead.] )(;B[qp] ;W[rp] (;B[qo] ;W[qr] C[White can't be killed unconditionally.] )(;B[rq] ;W[qo] ;B[pp] ;W[po] C[Black's loss is too big.] ))(;B[qr] ;W[qo] ;B[qp] ;W[po] C[Black's loss is too big.] )(;B[pp] ;W[qr] (;B[ro] ;W[rp] ;B[qp] ;W[sq] C[White can't be killed unconditionally.] )(;B[rp] ;W[qo] ;B[po] ;W[qp] ;B[ro] ;W[rn] (;B[qn] ;W[rm] )(;B[rm] ;W[qn] ;B[sn] ;W[so] ;B[sp] ;W[rq] (;B[sm] ;W[sq] ;B[so] ;W[rs] )(;B[so] ;W[sq] ;B[sm] ;W[rs] )))))