(;AB[aq]AB[ap]AB[ao]AB[bn]AB[bl]AB[dm]AW[bp]AW[cp]AW[cq]AW[do]AW[eo]AW[ep]AW[eq]AW[dq]AW[er]AW[fr]AB[gr]AB[gq]AB[fn]AB[go]AB[dn]AB[fs]AB[ir]AW[gs]AW[hs]AB[jq]C[black to kill]AP[goproblems]
(;B[br];W[cr];B[ds];W[cs])
(;B[ds];W[br];B[es];W[cs])
(;B[bs];W[cr];B[ds];W[cs])
(;B[cr];W[br]
(;B[cs];W[bs])
(;B[ar];W[bs])
(;B[bs]
(;W[dr]
(;B[ar];W[cs]
(;B[es];W[bq])
(;B[bq];W[as]C[2-step ko, not a best way to kill]))
(;B[cs];W[ds]
(;B[bq];W[as])
(;B[ar];W[as];B[bs];W[cs];B[bq]C[this ko is the best that black can do hereRIGHT]))
(;B[ds];W[es])
(;B[bq];W[cs];B[ar])))
(;B[bq];W[bs]))
(;B[ar];W[cr];B[ds];W[cs])
(;B[cs];W[br]))