(;AB[bq]AB[cq]AB[dq]AB[dr]AB[ds]AW[es]AW[er]AW[eq]AW[gr]AB[ep]AW[dp]AW[cp]AW[bp]AW[ap]AW[fr]AB[hq]AB[ho]AB[gq]AW[hr]AW[jq]AW[kq]AB[jp]AB[kp]AB[eo]AB[ip]AB[lp]AB[lq]AB[ls]AB[lr]AB[go]AW[cn]AW[bm]AW[cl]AP[goproblems]
(;B[ar];W[bs]
(;B[aq];W[ir]
(;B[gs]
(;W[js]
(;B[kr];W[hs]C[Please play on the marked pointsFORCE]TR[jr];B[jr];W[br]TR[iq]C[FORCE];B[iq];W[cs]TR[fq]C[FORCE];B[fq];W[cr]TR[as]C[FORCE];B[as];W[cs]TR[ks]C[FORCE];B[ks];W[bs]TR[is]C[FORCE];B[is]C[Good ko!CHOICERIGHT])
(;B[ks];W[hs]
(;B[jr];W[kr];B[iq];W[jr])
(;B[iq];W[jr]))
(;B[iq];W[hs]
(;B[jr];W[kr];B[ks];W[jr])
(;B[ks];W[jr]))
(;B[hs];W[kr]))
(;W[br];B[iq];W[js];B[hs];W[jr];B[fq];W[cs];B[ks];W[cr];B[as];W[bs];B[kr];W[cs];B[fs];W[is];B[gs];W[br];B[cr];W[bs];B[hs]C[White is dead!RIGHT]))
(;B[iq];W[js])
(;B[js];W[br]C[Please play on the marked points.]TR[is];B[is];W[cr]TR[hs];B[hs];W[cs]TR[as];B[as];W[cs]TR[gs];B[gs];W[cr]TR[jr];B[jr];W[bs]TR[br];B[br];W[cs]TR[iq];B[iq];W[cr])
(;B[kr];W[br]C[Please play on the marked points]TR[jr];B[jr];W[cs]TR[is];B[is];W[cr]TR[as];B[as];W[cs]TR[hs];B[hs];W[bs]TR[gs];B[gs];W[cr]TR[br];B[br];W[cs]TR[iq];B[iq];W[cr])
(;B[jr];W[js];B[kr];W[br]C[Please play on the marked points]TR[gs];B[gs];W[cs]TR[hs];B[hs];W[cr]TR[as];B[as];W[cs]TR[iq];B[iq];W[bs]TR[fq];B[fq];W[cr]TR[br];B[br];W[cs]TR[ks];B[ks];W[cr]))
(;B[ir];W[aq];B[br];W[cs];B[hs];W[cr];B[as];W[cs];B[gs];W[cr]))
(;B[ir];W[aq]
(;B[hs];W[br];B[gs];W[cs])
(;B[ar];W[bs];B[br];W[cs];B[hs];W[cr];B[as];W[cs];B[gs];W[cr]))
(;B[aq];W[br]
(;B[bs];W[ar])
(;B[ar]
(;W[ir]
(;B[bs];W[js]C[])
(;B[jr];W[kr]
(;B[ks];W[js];B[iq];W[jr])
(;B[js];W[is];B[ks];W[gs]))
(;B[iq];W[js])
(;B[kr];W[bs]C[Please play on the marked points]TR[jr];B[jr];W[cs]TR[is];B[is];W[cr]TR[as];B[as];W[cs]TR[hs];B[hs];W[bs]TR[gs];B[gs];W[cr]TR[br];B[br];W[cs]TR[iq];B[iq];W[cr]))
(;W[cs];B[ir];W[as]C[Black can do better.])))
(;B[bs];W[ar]
(;B[aq];W[br])
(;B[br];W[aq]))
(;B[br];W[bs]
(;B[cs];W[ar];B[as];W[aq]C[Very hard ko for black])
(;B[aq];W[cs];B[as];W[ar]C[Ko, white takes first (and white still has local threats to live with g2).]))
(;B[cs];W[br]))