(;AB[ab]AB[bb]AB[cb]AB[dc]AB[eb]AB[fb]AW[ac]AW[bc]AW[cc]AW[dd]AW[ed]AW[ce]AW[fc]AW[gc]AW[gb]C[What can White do?]AW[ib]AP[goproblems] (;W[fa];B[da] (;W[ec];B[ba];W[db]MA[dc]C[Well done, a ko! :)RIGHT]) (;W[ba];B[ec]C[:(])) (;W[da];B[db]C[:(]) (;W[ca];B[da]C[:(]TR[fa]TR[ba]) (;W[ba];B[ec] (;W[da];B[ca];W[fa];B[db]C[:(]) (;W[fa];B[da]C[:(])) (;W[db];B[da]C[:(]TR[fa]TR[ba]) (;W[ec];B[db]C[6 in a line at the corner are alive! :(]) (;W[ea];B[da]C[:(]TR[fa]TR[ba]) (;W[ga];B[da]C[:(]TR[fa]TR[ba]) (;W[aa];B[da]C[:(]TR[ba]TR[fa]))