from tesuji by james davies- ch. 14 ignore the atari
(;AW[rd]AW[qc]AW[qb]AW[pb]AW[oc]AW[nc]AW[mc]AW[rf]AW[qf]AW[pf]AW[qg]AW[qh]AW[qj]AW[og]AW[ng]AW[ni]AB[re]AB[qd]AB[pe]AB[pd]AB[pc]AB[oe]AB[of]AB[md]AB[mf]AB[pg]AB[ph]AB[pi]AB[pj]AB[qi]AB[rh]AB[sh]AB[si]AB[rj]AP[goproblems]
(;W[sf];B[rc];W[sd]C[white is safeRIGHT])
(;W[qe];B[sf];W[se];B[rg]C[not the best result -black gets to have a ko fight]))