(;AB[ab]AB[bb]AB[cc]AB[cd]AB[bf]AB[cf]AB[df]AB[bg]AW[bh]AW[cg]AW[dg]AW[di]AW[ba]AW[cb]AW[db]AW[dc]AW[dd]AW[ee]AW[ef]C[White to kill.]AP[goproblems]
(;W[bd];B[bc]
(;W[ad];B[de]
(;W[be];B[ag]
(;W[ae]C[RIGHT])
(;W[ah];B[ae];W[af]C[You can do better than ko.]))
(;W[ae];B[be]
(;W[af];B[ag])
(;W[ag];B[ac]))
(;W[af];B[ag]
(;W[be];B[ae])
(;W[ae];B[be])
(;W[ah];B[be]))
(;W[ag]
(;B[ae];W[be])
(;B[be]C[CHOICE]
(;W[af];B[ac])
(;W[ae];B[ac]))))
(;W[be];B[ad]
(;W[ce];B[de])
(;W[ae];B[ce];W[ac];B[af]))
(;W[ae];B[be];W[ad];B[de]
(;W[af];B[ag])
(;W[ag];B[ac]))
(;W[de];B[ad]))
(;W[bc];B[bd])
(;W[de];B[ad])
(;W[ce];B[de])
(;W[be];B[bd])
(;W[ae];B[be])
(;W[ad];B[bd])
(;W[ag];B[ad])
(;W[af];B[ag]))