(;AP[goproblems]AB[cb]AB[dc]AB[dd]AB[ed]AB[fd]AB[fc]AB[be]AW[bb][gb]AW[db]AW[eb]AW[ec]AW[fb]AW[hc]AW[he]AW[bh]AW[cf]AW[ef]AW[gf]AB[ca]AW[bc]AB[cc]AW[ce]AB[bd]AW[bf]C[Black to live](;B[ba]C[See previous problem.])(;B[ac];W[ae]TR[ab]TR[ba]C[:(])(;B[ab](;W[ac](;B[ad];W[aa];B[ba]C[Nice!RIGHT])(;B[ba];W[aa];B[ad]C[Nice!RIGHT])(;B[cd];W[aa]))(;W[ba](;B[ac];W[ae])(;B[ae];W[ac]C[This would be saved as a ko threat](;B[ad]C[Well done! Although C16 is slightly better as A16 allows white to play A14 in sente (in the endgame)RIGHT])(;B[cd]C[RIGHT]))(;B[cd];W[ae])(;B[ad];W[cd])))(;B[ae];W[ac](;B[ba];W[ab])(;B[ab];W[aa]TR[ad]TR[ba]C[:(]))(;B[aa]TR[ae]TR[ac]C[Congratulations! You found the one move white doesn't have to respond to! :D])(;B[cd];W[ab])(;B[ad];W[ab]))