(;AW[ck]AW[bl]AW[bm]AW[cm]AW[an]AW[dn]AW[fn]AW[ao]AW[do]AW[fo]AW[io]AW[dp]AW[bq]AW[cq]AW[br]AW[cs]AB[ek]AB[cl]AB[dm]AB[em]AB[bn]AB[cn]AB[co]AB[ap]AB[bp]AB[cp]AB[ep]AB[dq]AB[fq]AB[iq]AB[cr]AB[dr]AB[er]GM[1]FF[3]
(;B[ar]
(;W[as]
(;B[bs]C[koRIGHT])
(;B[ds];W[aq]))
(;W[am];B[aq];W[bs];B[ds]C[White cannot avoid the ko]))
(;B[aq];W[ar])
(;B[bs])
(;B[as];W[aq])
(;B[ds];W[aq])
(;B[am];W[aq];B[bo];W[an];B[ao];W[an])
(;B[en];W[eo]C[Making this exchange costs black a ko threat and a liberty.])
(;B[eo];W[en]C[Making this exchange costs black a ko threat and a liberty.]))