(;AB[dc]AW[ca]AB[cb]AB[ea]AB[eb]AW[fa]AW[fb]AW[gc]AW[bd]AW[cd]AW[ec]AB[dd]AW[ed]AW[de]AB[cc]AB[bc]AW[be]AP[goproblems] (;B[ba];W[da] (;B[db];W[ab] (;B[ac]C[The corner is safeRIGHT]) (;B[ad]C[];W[ac]C[Black dies]) (;B[aa];W[ac]C[Black dies]) (;B[bb];W[ac]C[Black dies])) (;B[bb];W[db]C[Black dies]) (;B[ab];W[db]C[No need to lose those stones]) (;B[ac];W[db]C[No need to lose those stones, and you have to play at a18 to save the whole group]) (;B[aa];W[ab]C[Black dies])) (;B[db];W[ac] (;B[ab];W[ba]C[Black has one eye and dies.]) (;B[ba];W[ab])) (;B[da];W[db]C[Oh dear]) (;B[bb];W[db]C[Snapback. Oops!]) (;B[aa];W[db]C[Snapback. Oops!]) (;B[ac];W[ba] (;B[bb];W[db];B[da];W[db]) (;B[da];W[db]) (;B[db];W[bb]C[Black has one eye and dies.]) (;B[ab];W[db];B[da];W[db])) (;B[ab];W[ba] (;B[da];W[db]) (;B[bb];W[db];B[da];W[db])))