(;AB[bp]AB[cp]AB[dp]AB[cn]AB[dr]AB[eq]AB[fq]AB[gq]AB[hr]AB[ir]AW[bq]AW[cq]AW[dq]AW[ep]AW[fp]AW[gp]AW[hq]AW[iq]AW[jq]AW[jr]C[Show off your endgame skills]AP[goproblems];W[er]
(;B[es]C[CHOICE];W[ds]
(;B[fr]C[];W[cr];B[cs];W[bs];B[ar];W[ds]C[Big koRIGHT])
(;B[cr]C[];W[fs];B[br];W[gr]C[RIGHT]))
(;B[fr];W[ds]C[Leads to ko againRIGHT]))