(;SZ[19]AW[ab]AW[db]AW[jb]AW[kb]AW[bc]AW[dc]AW[fc]AW[ic]AW[jc]AW[bd]AW[cd]AW[dd]AW[ed]AW[fd]AW[gd]AW[hd]AW[id]AB[ba]AB[da]AB[ea]AB[ia]AB[ja]AB[bb]AB[cb]AB[eb]AB[fb]AB[hb]AB[lb]AB[mb]AB[cc]AB[ec]AB[gc]AB[kc]AB[jd]AB[ld]AB[je]AB[if]AB[hf]AB[gf]AB[ef]AB[df]AB[bf]AB[cf]C[White to live. If Black can escape (at A) without you getting some stones, you die.]LB[ka:A]GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]KM[0.00] (;W[ka]C[];B[ga] (;W[hc];B[ib];W[gb]C[Advantageous ko. White can get better and live with no condition.]) (;W[ib];B[hc];W[ha];B[ia]C[]) (;W[ac];B[hc]C[])) (;W[ga];B[ka] (;W[gb];B[hc] (;W[ib]C[Well done. Black cannot connect and save his three stones, as he would still be in atari (oiotoshi, or connect-and-die).RIGHT]) (;W[ac];B[ha] (;W[aa];B[fa];W[ca];B[cb] (;W[bb];B[ba]C[Disadvantageous ko. White can do better and live wih no condition.]) (;W[ba]) (;W[cc];B[ba];W[bb];B[ca])) (;W[ib];B[fa])) (;W[ha];B[fa]) (;W[fa];B[ha]) (;W[la]C[RIGHT];B[ma] (;W[ib]C[Well done. Black cannot connect and save his three stones, as he would still be in atari (oiotoshi, or connect-and-die).RIGHT]) (;W[ha];B[fa]) (;W[fa];B[ha]) (;W[ac];B[ha] (;W[aa];B[fa];W[ca];B[cb] (;W[bb];B[ba]C[Disadvantageous ko. White can do better and live wih no condition.]) (;W[cc];B[ba];W[bb];B[ca]) (;W[ba])) (;W[ib];B[fa])))) (;W[ha];B[ib]) (;W[fa];B[gb]) (;W[ib];B[ha]) (;W[hc];B[gb]) (;W[la];B[ma]) (;W[ac];B[gb])) (;W[ib];B[ka] (;W[ga];B[ha]) (;W[ha];B[ga]) (;W[hc];B[gb]) (;W[gb];B[ga]) (;W[fa];B[ga]) (;W[la];B[ma]) (;W[ac];B[gb])) (;W[ha];B[ga]) (;W[hc];B[ka] (;W[gb];B[ga] (;W[gc];B[ha]) (;W[ib];B[gc]C[Disadvantageous ko. White can get better and live with no condition.])) (;W[ib];B[gb]) (;W[ha];B[ga]) (;W[ga];B[gb]) (;W[fa];B[ga]) (;W[ac];B[gb]) (;W[la];B[ma]C[] (;W[gb];B[ga] (;W[ib];B[gc]C[Disavantageous ko. White can get better and live with no condition.]) (;W[gc];B[ha])) (;W[ib];B[gb]) (;W[ha];B[ga]) (;W[ga];B[gb]) (;W[fa];B[ga]) (;W[ac];B[gb]))) (;W[gb];B[ga]) (;W[fa];B[ga]) (;W[ac];B[ka] (;W[hc];B[gb]) (;W[ga];B[gb]) (;W[gb];B[ga]) (;W[ib];B[gb]) (;W[ha];B[ga]) (;W[fa];B[ga]) (;W[aa];B[ca] (;W[hc];B[gb]) (;W[gb];B[ga]) (;W[ga];B[gb]) (;W[ha];B[ga]) (;W[fa];B[ga]) (;W[ib];B[gb]) (;W[la];B[ma] (;W[gb];B[ga]) (;W[fa];B[ga]) (;W[ga];B[gb]) (;W[ha];B[ga]) (;W[hc];B[gb]) (;W[ib];B[gb]))) (;W[la];B[ma] (;W[ga];B[gb]) (;W[hc];B[gb]) (;W[ib];B[gb]) (;W[ha];B[ga]) (;W[gb];B[ga]) (;W[fa];B[ga]) (;W[aa];B[ca] (;W[gb];B[ga]) (;W[fa];B[ga]) (;W[ga];B[gb]) (;W[ha];B[ga]) (;W[hc];B[gb]) (;W[ib];B[gb])))))