(;AW[cp]AB[dr]AB[dq]AB[ep]AB[fp]AB[gp]AB[hq]AB[gr]AB[fr]AB[gs]AW[fo]AW[go]AW[eo]AW[ip]AW[ir]AW[hr]AW[iq]AW[ho]AW[hs]AW[bp]AW[es]AW[ds]AB[cs]C[Hmm...]AB[hp]AW[do]AW[cr]AW[aq]AP[goproblems] (;B[br];W[bs];B[cq] (;W[bq];B[cs]C[Well done, taking first and having a local threat!RIGHT]MA[er]MA[fq]) (;W[cs];B[er]LB[fq:1]LB[fs:2]C[w can't avoid the ko! (of course b better take b3 before playing e2...)RIGHT])) (;B[cq];W[br]C[miai! if only black had one more liberty... (see previous problem)]MA[er]MA[fq]) (;B[fq];W[er] (;B[br];W[bs];B[cq];W[cs]) (;B[cq];W[br])) (;B[er];W[fq] (;B[br];W[bs];B[cq];W[bq];B[cs]C[Taking first but E2-F3 exchange wasted the local threat!]) (;B[cq];W[br])))