(;AB[cd]AB[dd]AB[dc]AB[db]AB[ed]AB[gd]AB[fd]AW[ce]AW[cf]AW[bf]AW[bg]AW[de]AB[ee]AB[df]AB[dg]AW[ef]AB[cg]AW[ff]AW[fg]AW[fh]AB[eg]AB[ei]AB[eh]AW[ch]AW[dh]AW[dj]AW[cj]AW[fi]AW[ek]AB[bh]AB[bi]C[Black to seal in corner.]
(;B[bd]C[];W[ae]
(;B[be];W[di];B[ad];W[ej];B[af];W[ag]C[can do better.])
(;B[ad];W[di];B[be];W[ej]C[can do better];B[af];W[ag]C[can do better.]))
(;B[be];W[bd])
(;B[ag];W[ae];B[bd];W[di]
(;B[be];W[ej]C[sente, but can do better.])
(;B[ad];W[ej]C[sente, but can do better.];B[be];W[af]C[can do better]))
(;B[ae]
(;W[bd]C[white is unreasonable here.];B[ag]
(;W[be];B[bc]
(;W[di];B[ad];W[ej];B[af];W[bj]C[white loses big.])
(;W[af];B[ad]))
(;W[di];B[be];W[ej];B[af];W[ad];B[ah]
(;W[bj];B[bc])
(;W[bc];B[bb])))
(;W[ag]C[CHOICE];B[be];W[di]C[correct, and white will have to put two stones in before Black have to play at B16RIGHT]))
(;B[af];W[ae])
(;B[ad];W[ae];B[ag];W[di];B[bd];W[ej];B[be];W[af]C[can do better]))