Black to kill. This problem will be easy for strong players, but some of the "wrong" variations get quite interesting. Perhaps stronger players may amuse themselvs by looking for mistakes in the "wrong" variations I have suggested.
(;AW[bb]AW[cb]AW[db]AW[cc]AW[bf]AW[bg]AB[da]AB[eb]AB[dc]AB[dd]AB[ed]AB[df]AB[cg]AB[ch]AB[bh]C[Black to kill]SZ[19]AE[fc]
(;B[bd]AE[fc];W[cd]
(;B[be];W[ce];B[cf]C[ Well done !RIGHT])
(;B[ce];W[be];B[ae];W[ad];B[ac];W[bc];B[ag];W[ab];B[ad];W[af])
(;B[ag];W[be]))
(;B[be];W[bd]
(;B[ce];W[ad];B[ca];W[ba]
(;B[ab]TR[ae]TR[cd]C[This move only works when the marked liberties are filled.];W[ac])
(;B[ac];W[ab]))
(;B[ca];W[ba];B[ac];W[ad];B[ab];W[ce];B[cd];W[cf]))
(;B[cd];W[bd]
(;B[be];W[ce])
(;B[ag];W[ac]))
(;B[ce];W[be];B[bd];W[cd];B[ae];W[ad];B[ac];W[bc];B[ag];W[ab];B[ad];W[af])
(;B[ca];W[cd]
(;B[ce];W[be];B[ba];W[ad])
(;B[be];W[ce];B[af];W[ag];B[ad];W[cf];B[ba];W[bd])))