(;AB[ds]AB[dr]AB[fs]AB[gs]AB[eq]AB[fq]AB[fp]AB[gq]AB[hq]AB[ir]AB[hr]AB[jr]AW[cs]AW[cr]AW[cq]AW[dq]AW[ep]AW[do]AW[fo]AW[go]AW[hp]AW[ip]AW[jq]AW[kr]AW[ks]AW[js]AW[is]AW[kq]AW[jp]C[What's the best way for black to live?]AW[hs]AP[goproblems]
(;B[es];W[fr]C[Not the best. :(])
(;B[er]C[Good. This leaves no ko threats for white.RIGHT])
(;B[fr]C[Black lives, but white has a ko threat at E2 (or E1).]TR[er]))