This is my first time of adding a problem. If something is wrong, just tell me.
Black A is not a good move. White B is the right reply for that. What should black do next...?
(;AB[dp]AW[fq]AB[hq]AW[cq]AB[dq]AW[cp]AW[cr]AB[co]LB[co:A]LB[cr:B]AP[goproblems]
(;B[do];W[dr];B[fp];W[eq];B[gp]C[OK for both.RIGHT])
(;B[dr];W[do]
(;B[eo];W[dn];B[fp];W[cn]C[Bad for black.])
(;B[cn];W[ep]C[D4 group is dead.])
(;B[dn];W[eo]C[D4 group is dead.])))