(;AW[ar]AW[br]AW[bs]AW[cq]AW[dr]AW[er]AB[fs]AB[fr]AB[fq]AB[ep]AB[dp]AB[cp]AB[bp]AB[bq]AP[goproblems]
(;B[cr];W[cs]
(;B[dq];W[es]C[White gets a ko; you could have killed without ko.])
(;B[es]C[];W[dq]
(;B[ds]C[RIGHT])
(;B[eq];W[ds])))
(;B[dq];W[cr]
(;B[es];W[ds])
(;B[cs];W[ds])
(;B[ds];W[es]))
(;B[es];W[ds]
(;B[dq];W[cr])
(;B[cr];W[dq]))
(;B[ds];W[es]))