Not only does Black seem to lack sufficient eye space, his four stones on the left are short of liberties: he seems to have little chance of saving himself. However, there is one move — and one move only — that will secure two eyes.
(;AW[kp]AW[kq]AW[kr]AW[ir]AW[lp]AW[np]AW[op]AW[mp]AB[lq]AB[mq]AB[lr]AB[nq]AB[pq]AB[pr]AB[qr]AW[pp]AW[qq]AW[rq]AW[rr]C[Black to play and live]AP[goproblems]
(;B[ms]
(;W[nr];B[qs]
(;W[os]
(;B[oq]LB[ms:1]LB[nr:2]LB[qs:3]LB[os:4]LB[oq:5]LB[ns:a]LB[or:b]C[Black 1 is the only move that secures two eyes. If White 2, descending at 3 is important. If White 4, Black 5 makes miai of 'a' and 'b', guaranteeing a seki. In connection with this problem, Watanabe Reiji 5-dan made the comment: 'I always tell my pupils that making a jagged shape is the best way to live.' RIGHT])
(;B[or]C[RIGHT])
(;B[ns]C[RIGHT]))
(;W[oq];B[or]C[RIGHT]))
(;W[oq];B[or];W[nr]
(;B[qs]LB[ms:1]LB[oq:2]LB[or:3]LB[nr:4]LB[qs:5]LB[ns:a]C[If White counters 1 by cutting with 2 and 4, Black simply descends at 5. If he carelessly played 5 at 'a', the hane of White 5 would kill him. RIGHT])
(;B[ns];W[qs]
(;B[ps];W[os]C[CHOICE])
(;B[ls];W[ps]C[CHOICE])
(;B[mr];W[ps]C[CHOICE]))))
(;B[oq];W[nr]
(;B[qs];W[ms];B[ls];W[os]LB[oq:1]LB[nr:2]LB[qs:3]LB[ms:4]LB[ls:5]LB[os:6]LB[ns:a]C[Trying to expand his eye space with 1 backfires when White attaches at 2. Black 3 and 5 are useless, as White creates a gomoku-nakade. If Black plays 3 at 'a', White 4 kills him. CHOICE])
(;B[ns];W[ms]C[CHOICE]))
(;B[qs];W[oq];B[or];W[ms];B[ls];W[nr]LB[qs:1]LB[oq:2]LB[or:3]LB[ms:4]LB[ls:5]LB[nr:6]C[If Black 1, White exploits his shortage of liberties with 2 to 6. CHOICE])
(;B[nr];W[oq];B[or];W[ms];B[ls];W[qs];B[ps];W[ns]C[CHOICE])
(;B[ls];W[qs]
(;B[ns];W[ps]LB[ls:1]LB[qs:2]LB[ns:3]LB[ps:4]LB[oq:a]LB[mr:b]LB[or:c]C[The descent to Black 1 is also not a very flexible answer The white bane at 2 is a good move, and then answering Black 3 by pushing in once again with White 4 kills the group. After this, if Black plays 'a , White answers at `b', and if Black tries b', a white bane at 'c' kills him. Also, if Black should play 3 at 'a', White crawls to 4.]
(;B[oq];W[mr];B[nr];W[os]C[CHOICE])
(;B[mr];W[or]
(;B[os];W[oq]C[CHOICE])
(;B[oq];W[os]C[CHOICE])
(;B[nr];W[os];B[oq];W[rs]C[CHOICE])))
(;B[oq];W[ps]C[CHOICE]))
(;B[ns];W[qs]
(;B[ps];W[or]C[CHOICE];B[oq]C[];W[ls]C[]
(;B[nr];W[ms]C[CHOICE])
(;B[ms];W[nr]C[CHOICE]))
(;B[ls];W[ps]LB[ls:1]LB[qs:2]LB[ns:3]LB[ps:4]LB[oq:a]LB[mr:b]LB[or:c]C[The descent to Black 1 is also not a very flexible answer The white bane at 2 is a good move, and then answering Black 3 by pushing in once again with White 4 kills the group. After this, if Black plays 'a , White answers at `b', and if Black tries b', a white bane at 'c' kills him. Also, if Black should play 3 at 'a', White crawls to 4.]
(;B[oq];W[mr];B[nr];W[os]C[CHOICE])
(;B[mr];W[or]
(;B[os];W[oq]C[CHOICE])
(;B[oq];W[os]C[CHOICE])
(;B[nr];W[os];B[oq];W[rs]C[CHOICE])))))