(;AB[bp]AB[bq]AB[dr]AB[er]AB[eq]AB[fq]AB[dp]AB[do]AB[eo]AB[fo]AB[go]AB[hn]AB[hp]AB[ip]AB[iq]AW[ep]AW[fp]AW[gp]AW[gq]AW[hq]AW[ir]AW[jr]AW[jq]AW[cr]AW[cq]AW[dq]AW[fs]TR[dr]TR[er]TR[eq]TR[fq]AP[goproblems]
(;B[gs];W[gr]
(;B[br];W[ds]
(;B[cp]C[Correct.RIGHT]
(;W[es];B[cs]C[RIGHT])
(;W[cs];B[bs]
(;W[fr];B[es]C[RIGHT])
(;W[es];B[fr]C[RIGHT])))
(;B[cs];W[bs]C[Incorrect.]))
(;B[cp];W[br]
(;B[ar]C[Also works.RIGHT])
(;B[cs];W[ds]C[Incorrect.]
(;B[ar];W[bs])
(;B[es];W[fr])
(;B[bs];W[as];B[cs];W[fr]))))
(;B[gr];W[hr]
(;B[cs];W[bs];B[es];W[ds]C[Ko. Black can do better.])
(;B[cp];W[ds]C[Incorrect.]
(;B[br];W[cs];B[bs];W[es])
(;B[es];W[fr])
(;B[gs];W[es])
(;B[cs];W[bs];B[br];W[cs]))
(;B[br];W[ds]C[Incorrect.]
(;B[cs];W[bs])
(;B[es];W[fr])
(;B[gs];W[es])
(;B[cp];W[cs];B[bs];W[es]))
(;B[ds];W[cs]C[Incorrect.]))
(;B[br];W[ds];B[cp];W[cs]C[Incorrect.]
(;B[es];W[fr])
(;B[bs];W[es])
(;B[gr];W[hr];B[bs];W[es]))
(;B[hr];W[gr]C[Incorrect.];B[br];W[ds]
(;B[fr];W[es])
(;B[gs];W[hs])
(;B[es];W[fr])
(;B[cs];W[bs])
(;B[cp];W[cs]
(;B[es];W[fr])
(;B[fr];W[es])
(;B[gs];W[hs]))))