Black to win.
Please play the the moves in order of decreasing value.
White has no komi.
(;GM[1]
FF[4]
AP[Hibiscus:2.1]
SZ[13]
ST[3]
;AB[bb][bk][cb][cc][cj][ck][dd][dh][di][dl][ec][ed][ee][ei][ek][fb][fc][fh][fk][gb][gd][ge][gf][gl][hf][hh][hj][hl][id][if][ij][ik][il][im][jf][jg][jh][jj][ke][ki][ld][le][li][lm]
AW[ab][ac][bc][be][bi][bj][cd][ch][ci][dc][de][df][dg][ef][fe][ff][fg][fi][fj][gg][gh][gi][gk][hb][hc][hd][he][hg][hi][hk][ie][ii][jc][je][ji][jk][jl][jm][kd][kj][kl][lc][lj][ll]
PL[B]
C[Black to win.]
;B[mj]
MN[1]
;W[mk]
;B[mi]
(;W[lk]
(;B[kb]
(;W[kc]
(;B[ha]
;W[ia]
;B[ga]
;W[ib]
;B[mc]
;W[mb]
;B[md]
;W[lb]
(;B[ak]
(;W[aj]
;B[gj]
;W[ba]
(;B[da]
;W[ej]
;B[dj]
;W[eh]
;B[ih]
C[RIGHT
Black wins by 1 point.]
)(;B[db]
C[Sorry, but you've just suffered a half
point loss.]
))(;W[gj]
C[If white plays here...]
;B[ai]
C[black can play here in sente!]
;W[ah]
;B[aj]
;W[bg]
))(;B[aj]
;W[ai]
;B[ak]
C[Black has won a point but lost sente.]
))(;B[mc]
;W[mb]
;B[md]
;W[lb]
;B[ha]
;W[ia]
;B[ga]
;W[ib]
;B[ak]
;W[aj]
;B[gj]
;W[ba]
;B[da]
;W[ej]
;B[dj]
;W[eh]
;B[ih]
C[RIGHT
Black wins by 1 point.]
))(;W[lb]
;B[kc]
;W[jd]
;B[mb]
;W[jb]
;B[mc]
;W[ka]
))(;B[ha]
;W[ia]
;B[ga]
;W[kb]
C[Black lost points here.]
)(;B[mc]
;W[mb]
;B[md]
;W[lb]
C[Black lost points here.]
))(;W[ak]
;B[lk]
;W[kk]
;B[ml]
C[This ko is too dangerous to play for
white.]
))
