White has been confined to a small space, and now must try to find life.
(;AB[kd]AB[kc]AB[kb]AB[le]AB[lf]AB[lg]AB[ng]AB[nh]AB[of]AB[pf]AB[qg]AB[qe]AB[pd]AB[qd]AB[qc]AB[qb]AB[ph]AB[mc]AB[nc]AW[lc]AW[ld]AW[md]AW[mb]AW[nf]AW[ne]AW[oe]AW[pe]AW[od]AW[oc]AW[pc]AW[og]AW[pg]AW[oh]AW[oi]AB[qf]C[Can white live?]AB[qh]AB[ri]AB[sh]AW[pi]AW[qi]AW[rj]AW[qk]AP[goproblems]
(;W[lb];B[pb]
(;W[ob];B[oa]
(;W[na];B[la])
(;W[la];B[na]))
(;W[nb];B[ob]C[No chance of getting two eyes; M19 and O19 are mi-ai]))
(;W[ob];B[lb]
(;W[nb];B[pb])
(;W[ma];B[pb]
(;W[oa];B[nb]C[dead])
(;W[nb];B[oa])))
(;W[pb]
(;B[nb]C[CHOICE]
(;W[lb];B[pa]
(;W[oa];B[qa]
(;W[ma];B[me]
(;W[nd]C[seki!RIGHT])
(;W[na]C[Dead]))
(;W[la];B[ob])
(;W[na];B[la]C[dead])
(;W[nd]C[If you check this position closely, you see that the best black can do is make a seki with black M19-white N19.RIGHT]))
(;W[na];B[oa];W[ob];B[la];W[qa];B[pa])
(;W[la];B[oa])
(;W[mg]C[NOTTHIS]))
(;W[ob];B[lb])
(;W[ma];B[lb])
(;W[na];B[lb]
(;W[ob];B[ma])
(;W[oa];B[ma])
(;W[ma];B[oa]))
(;W[mg]C[NOTTHIS]))
(;B[lb];W[nb])
(;B[pa]C[CHOICE]
(;W[oa];B[nb]
(;W[lb];B[qa]
(;W[ma];B[me];W[nd]C[seki!RIGHT])
(;W[na];B[la])
(;W[la];B[ob])
(;W[ob];B[la])
(;W[nd]C[If you examine this position closely, you'll see that the best black can do is to make a seki with black M19-white N19.RIGHT]))
(;W[ma];B[lb]
(;W[na];B[la]C[White may capture at R19, but what remains is a dead shape.])
(;W[ob]C[dead as it stands.])
(;W[qa];B[na]))
(;W[na];B[lb];W[ma];B[qa])
(;W[qa];B[lb];W[ma];B[na])
(;W[mg]C[NOTTHIS]))
(;W[nb];B[oa])
(;W[lb];B[oa])
(;W[na];B[oa];W[mg]C[NOTTHIS])
(;W[mg]C[NOTTHIS])))
(;W[nb];B[pb]C[M18 and M19 are mi-ai for black, as are P18 and P19, so white will never get a second eye on the edge.])
(;W[oa];B[nb]
(;W[na];B[lb];W[ma];B[pb])
(;W[ob];B[lb];W[ma];B[me])
(;W[lb];B[pb];W[ob];B[la])
(;W[ma];B[lb]
(;W[na];B[pb])
(;W[pa];B[pb])
(;W[pb];B[la];W[na];B[me]))
(;W[pb];B[lb]
(;W[ma];B[na])
(;W[na];B[ma])))
(;W[pa];B[pb];W[ob];B[lb]
(;W[ma];B[nb])
(;W[nb]C[dead as it stands])
(;W[oa];B[ma]))
(;W[nd];B[pb])
(;W[mg]C[NOTTHIS]))