This occurred during the end of one of my games. I found it interesting and I haven't found any problems matching it. possibly deceiving to beginners. (I should know, my first submit of this problem was not the ideal situation.)
(;AW[ap]AW[bp]AW[cp]AW[bo]AW[do]AW[co]AW[cn]AW[cq]AW[cr]AW[er]AW[eq]AW[ep]AW[fp]AW[fo]AB[ao]AB[an]AB[bn]AB[bm]AB[cm]AB[dm]AB[dn]AB[en]AB[fn]AB[eo]AB[dp]AB[dq]AB[dr]AB[cs]AB[br]C[can black survive if white plays ideally? if not, click no.]LB[gr:No]AP[goproblems]
(;B[ds];W[bs];B[as];W[es];B[bs];W[aq]C[RIGHT])
(;B[gr]C[Nope, black can live! Try again!]))