Black to live his endangered group in the best way.
(;AB[sj][sk][rj][qj][pj][oj][ni][nh][oh][pg][pf][od][oc][ob]AW[pb][pc][rc][rb][oi][pi][ph][qh][nj][nk][ok][pk][qk][rk][rl][sl]C[Hint: Black might not be able to capture White's four wizards; nevertheless, he is able to take advantage!]TR[oi][pi][ph][qh]AP[goproblems]
(;B[rh];W[qg]
(;B[rg];W[qf];B[qe];W[rf];B[re];W[sf]C[Now what?]
(;B[si];W[se]
(;B[sd];W[rd]
(;B[sg];W[sc];B[qi];W[sd]C[Yes! Black has lived in sente and sent the four White wizards back to their caves.RIGHT])
(;B[qi];W[sc];B[sg];W[sd]C[Yes! Black has lived in sente and sent the four White wizards back to their caves.RIGHT]))
(;B[sg];W[sd];B[qi];W[ql]C[You are alive, but White got away in sente (suppose R8 is a useful tenuki play). Try to kill the corner if you think White is mistaken..]
(;B[qd];W[qc]
(;B[qa];W[pa]
(;B[ra];W[sa]
(;B[sb];W[sc]
(;B[sa];W[qb];B[ra];W[sa];B[sb];W[qa])
(;B[oa];W[qb])
(;B[rd];W[qb])
(;B[pd];W[qb]))
(;B[rd];W[sc];B[sb];W[qb]))
(;B[rd];W[sc];B[ra];W[sa];B[sb];W[qb]))
(;B[rd];W[sc];B[qa];W[pa];B[ra];W[sa];B[sb];W[qb]))
(;B[qa];W[qd]))
(;B[qi];W[sd];B[sg];W[ql]C[You are alive, but White got away in sente (suppose R8 is a useful tenuki play). Try to kill the corner if you think White is mistaken..]
(;B[qd];W[qc]
(;B[qa]
(;W[pa]
(;B[ra];W[sa]
(;B[sb];W[sc]
(;B[sa];W[qb];B[ra];W[sa];B[sb];W[qa])
(;B[oa];W[qb])
(;B[pd];W[qb])
(;B[rd];W[qb]))
(;B[rd];W[sc];B[sb];W[qb]))
(;B[rd];W[sc];B[ra];W[sa];B[sb];W[qb])))
(;B[rd];W[sc];B[qa];W[pa];B[ra];W[sa];B[sb];W[qb]))
(;B[qa];W[qd])))
(;B[qi];W[si])
(;B[se];W[ri]
(;B[si];W[sh]C[Ouch...])
(;B[sh];W[qi]C[Ouch...])))
(;B[qf];W[rg];B[rf];W[ri]C[Black is captured.]))
(;B[sh];W[rg]
(;B[rh];W[qg]C[It seems that Black cannot contain White!])
(;B[rf];W[sg];B[rh];W[qg]
(;B[qf];W[ri]C[Black is one liberty short.])
(;B[sf]
(;W[ri]C[CHOICE])
(;W[qf];B[qe];W[ri]))))
(;B[rg];W[ri]C[Oops, White has captured Black...])
(;B[qg];W[rh]
(;B[rg];W[si])
(;B[sh]
(;W[sg];B[ri];W[si])
(;W[rg];B[rf];W[sg];B[ri];W[si]))))
