This problem was in a kgs game. B made a mistake to prevent w from making a false eye, but it was a mistake. In the game however, w didn't make the seki, but played elsewhere. Anyway hope you like. Very easy and if u see any other variations, let me know.
(;AB[br]AB[cr]AB[cs]AW[bs]AW[ds]AW[dr]AW[es]AW[fs]AW[gs]AW[gr]AW[gq]AW[gp]AW[go]AB[dq]AB[er]AB[fr]AB[fq]AB[cp]AB[bo]AB[ao]AB[co]AW[an]AW[cn]AW[bn]AW[dn]AW[do]AB[ep]AB[fp]AW[fo]AW[fm]AW[bq]AB[dp]MA[dp]C[B played at the marked stone. W to punish.]AP[goproblems]
(;W[cq];B[as]
(;W[aq];B[ap];W[eo]C[yep, seki!RIGHT])
(;W[ap];B[bp]))
(;W[ar];B[cq])
(;W[aq]))
