White to slay the five Black tigers in the corner.
(;AB[cs]AB[br]AB[dr]AB[cp]AB[ap]AW[ds]AW[es]AW[er]AW[eq]AW[dp]AW[do]AW[en]AW[cn]AW[an]AW[bn]C[Hint: The first move is very important.]AP[goproblems]
(;W[ar];B[as]
(;W[bo];B[bp];W[cq];B[bq]C[Good! Now, how to create a ko?]
(;W[cr];B[dq];W[cr];B[cq];W[bs]C[Yes!! White has created a ko in the corner.RIGHT])
(;W[dq];B[cr];W[bs];B[aq]C[It's just right for Black to unconditionally live...]))
(;W[cq];B[bq];W[bs];B[cr]
(;W[dq];B[aq])
(;W[aq];B[dq])))
(;W[dq];B[cr];W[cq];B[bq];W[ar];B[as];W[bs];B[aq]C[Doesn't work...])
(;W[cq];B[bq]
(;W[dq];B[cr];W[ar];B[as];W[bs];B[aq]C[Doesn't work...])
(;W[cr];B[bs]
(;W[dq];B[ar])
(;W[ar];B[dq];W[cr];B[cq])
(;W[bp];B[bo]
(;W[ar];B[dq])
(;W[dq];B[ar])))
(;W[ar];B[as];W[bs];B[cr]
(;W[dq];B[aq])
(;W[aq];B[dq]))))