Thanks to the players of the game. Special thanks to pugnacious. Comments are welcome, especially corrections.
(;AW[bb]AW[ac]AW[cc]AW[cb]AW[bd]AB[be]AB[ce]AB[cd]AB[db]AB[dc]AB[dd]AB[df]AB[dg]AB[dh]AB[di]AB[ci]AB[dj]AB[eh]AB[fh]AB[fi]AB[fj]AB[ej]AW[ed]AW[ef]AW[eg]AW[fg]AW[dk]AW[ek]AW[fk]AW[gj]AW[gi]AW[gh]AW[bi]AW[bh]AW[ch]AW[cg]AW[cj]AW[ck]AB[bj]AB[eb]AW[gb]AW[fc]AW[hc]C[Please play the best sequence for black. If you think black cannot do anything, please play on the T at H15 to tenuki. Please do not play pointless forcing moves.]LB[he:T]AP[goproblems]
(;B[ae]
(;W[ad]
(;B[bg]C[]
(;W[ag]
(;B[cf]
(;W[af]
(;B[bf];W[aj]
(;B[ah];W[bk];B[ag]C[Very nice! White had the option to make a ko.RIGHT])
(;B[ai];W[bk];B[ah];W[ag]))
(;B[ah];W[ai];B[bf];W[bk];B[ah];W[ag])
(;B[aj];W[bf];B[ai];W[bk])
(;B[bk];W[bf];B[ai];W[bl])
(;B[ai];W[bf];B[aj];W[bk])
(;B[ak];W[bk]
(;B[bf];W[aj];B[ah];W[ag])
(;B[ai];W[al];B[bf];W[aj];B[ah];W[ag])))
(;W[bf]C[];B[af];W[bk]C[I don't know whether B9 or A10 is better for white.];B[bg]C[Ko, black takes first. Black has a few local ko threats.RIGHT])
(;W[ah]C[];B[af];W[bf]C[Ko, white takes first. However, this ko is heavier for white than the other ko. Black has a few local threats. To end the ko, white can play b9 or a10.RIGHT]))
(;B[af];W[cf])
(;B[ai];W[ah]))
(;W[cf];B[bf];W[bk];B[ag]C[RIGHT])
(;W[bf]C[];B[cf];W[ag];B[af];W[bk]C[I don't know whether B9 or A10 is better for white.];B[bg]C[Ko, black takes first. Black has a few local ko threats.RIGHT]))
(;B[ag];W[bg])
(;B[cf];W[bg])
(;B[bf];W[he]C[White tenukis. Black just died in gote!])
(;B[af]C[];W[he]C[White tenukis. Black just died in gote!])
(;B[ah];W[bg])
(;B[ai];W[bg]))
(;W[bg];B[ad]C[Black is grateful, white cannot win this ko.]))
(;B[bg];W[ae]C[Black only gets a false eye.])
(;B[af];W[ad]
(;B[bg];W[cf])
(;B[cf];W[bg])
(;B[ai];W[bk]))
(;B[cf];W[bg])
(;B[bf];W[he]C[White tenukis. Black just died in gote!])
(;B[he]C[There is something black can do, actually.])
(;B[ag];W[bg])
(;B[ad];W[ae];B[af];W[ad])
(;B[ff];W[ee]C[Sorry, but that's what I meant with 'pointless forcing moves'.])
(;B[ee];W[fe]C[Sorry, but that's what I meant with 'pointless forcing moves'.]))