Kang Dongyun (W) just played the marked stone.
Play the move that will prevent the most tenacious W resistance.
(;AB[qb]AB[pc]AB[oc]AB[od]AB[oe]AB[nd]AB[nf]AB[og]AB[qd]AB[pj]AB[pp]AB[cn]AB[dn]AB[dk]AB[dj]AB[ei]AB[fj]AB[dd]AB[ce]AB[ed]AB[fd]AB[ec]AB[fb]AB[hd]AW[qc]AW[rc]AW[pd]AW[pe]AW[pf]AW[of]AW[qf]AW[nc]AW[md]AW[me]AW[ne]AW[co]AW[dp]AW[fp]AW[ej]AW[di]AW[ci]AW[cf]AW[cd]AW[bc]AW[dc]AW[cb]AW[cc]AW[eb]AW[fc]MA[pf]C[This was a 30 second byo yomi speed go match.The correct move was discovered later as the players reviewed the game.]AP[goproblems]
(;B[mb]
(;W[nb]C[CHOICE]
(;B[pb]LB[mc:A]LB[rd:B]C[A and B are miai.RIGHT])
(;B[ob];W[oa];B[pb];W[mc]C[Now what?]))
(;W[mc];B[nb];W[rb]C[CHOICE]
(;B[lb]TR[nc]TR[mc]TR[md]TR[me]TR[ne]C[So heavy.RIGHT])
(;B[pb];W[lb]C[Not living large.];B[oa]C[Not living large.]))
(;W[lb];B[mc];W[lc]C[CHOICE];B[ob]C[B has sente.RIGHT]))
(;B[mc];W[mb]
(;B[nb];W[lc]
(;B[rb];W[rd]
(;B[sc];W[sb];B[sa];W[sd];B[lb];W[nc];B[re];W[qe];B[mc];W[ng];B[mf];W[nc];B[se];W[qd];B[mc];W[lf];B[mg];W[nc]
(;B[qg]TR[qg]C[This ko threat loses points according to Ryu Shikun 9p];W[pg]C[The r13 ko threat loses points according to Ryu Shikun 9p.];B[mc];W[oh]
(;B[ma];W[mh]C[Ladder.])
(;B[mh];W[nc];B[rf];W[qh];B[mc];W[eh];B[ek];W[nc];B[ob];W[mc];B[kb];W[jc];B[jb];W[ma];B[pa];W[ic]C[Worse than the actual game.]))
(;B[pg];W[ob]
(;B[pb];W[na];B[qg];W[rf];B[rg];W[sf];B[sg];W[sb]C[Black has no ko threats.])
(;B[mc];W[pb]C[Oops!]))
(;B[ob]C[In the original game, Yuki Satoshi 9p connected here shaking his head. He went on to win the game though.];W[mc]C[In the original game, Yuki Satoshi 9p shook his head as he connected p18. He went on to win the game though.];B[kb];W[qh];B[nh];W[jc];B[jb];W[ma];B[pa];W[ic]C[http://igokisen.web.fc2.com/22atsf2.sgf]))
(;B[sb];W[nc];B[ob]C[Things could be worse, but they could have been better also.]))
(;B[lb];W[nc];B[rb];W[ob]C[Argh!];B[pb];W[na];B[rd];W[ng];B[mf];W[oh]))
(;B[lc];W[nb];B[pb];W[rb]C[Oops!]))
(;B[nb];W[mb];B[mc];W[lc]
(;B[rb];W[rd]
(;B[sc];W[sb];B[sa];W[sd];B[lb];W[nc];B[re];W[qe];B[mc];W[ng];B[mf];W[nc];B[se];W[qd];B[mc];W[lf];B[mg];W[nc]
(;B[qg]TR[qg]C[This ko threat loses points according to Ryu Shikun 9p];W[pg]C[The r13 ko threat loses points according to Ryu Shikun 9p.];B[mc];W[oh]
(;B[ma];W[mh]C[Ladder.])
(;B[mh];W[nc];B[rf];W[qh];B[mc];W[eh];B[ek];W[nc];B[ob];W[mc];B[kb];W[jc];B[jb];W[ma];B[pa];W[ic]C[Worse than the actual game.]))
(;B[pg];W[ob]
(;B[pb];W[na];B[qg];W[rf];B[rg];W[sf];B[sg];W[sb]C[Black has no ko threats.])
(;B[mc];W[pb]C[Oops!]))
(;B[ob]C[In the original game, Yuki Satoshi 9p connected here shaking his head. He went on to win the game though.];W[mc]C[In the original game, Yuki Satoshi 9p shook his head as he connected p18. He went on to win the game though.];B[kb];W[qh];B[nh];W[jc];B[jb];W[ma];B[pa];W[ic]C[http://igokisen.web.fc2.com/22atsf2.sgf]))
(;B[sb];W[nc];B[ob]C[Things could be worse, but they could have been better also.]))
(;B[lb];W[nc];B[rb];W[ob]C[Argh!];B[pb];W[na];B[rd];W[ng];B[mf];W[oh]))
(;B[rd];W[nb];B[rb];W[pb];B[sc];W[qc];B[rc];W[ob];B[qc]C[B gote and needs another move in the corner to live..])
(;B[rb];W[nb]
(;B[rd];W[pb];B[sc];W[qc];B[rc];W[ob];B[qc]C[B gote and needs another move in the corner to live..])
(;B[ob];W[oa];B[pb];W[rd]
(;B[mc];W[mb];B[lc];W[lb]
(;B[sb];W[kd];B[re];W[sd];B[rf];W[rg];B[qg];W[pg];B[qh];W[ph];B[rh];W[sg];B[sh];W[qe]C[W is not getting caught.])
(;B[sc];W[sb];B[sa];W[sd]C[Black can't win this ko.]))
(;B[sc];W[sb];B[sa];W[sd];B[mc];W[mb];B[lc];W[lb])))
(;B[pb];W[rb];B[mb];W[mc];B[nb];W[lb]C[Not living large.];B[oa]C[Not living large.]))