(;
AW[pb][nc][pc][od][qd][rd][of][oh][qh][rh]AB[qc][rc][pd][pe][qf][rf]
C[Black to play and live.
]
(;B[ra];W[rb];B[qb];W[sb]
(;B[sc];W[sd];B[sa];W[pa]
(;B[qe];W[qa]
(;B[se];W[rb];B[re]C[RIGHT
])
(;B[re];W[rb];B[se]C[RIGHT
])
)
(;B[re];W[qa]
(;B[qe];W[rb];B[se]C[RIGHT
])
(;B[se];W[rb];B[qe]C[RIGHT
])
)
(;B[se];W[qa]
(;B[qe];W[rb];B[re]C[RIGHT
])
(;B[re];W[rb];B[qe]C[RIGHT
])
)
)
(;B[sd];W[se])
)
(;B[sd];W[rb]
(;B[re];W[qb]
(;B[qe];W[sf]C[Black has one eye.
])
(;B[sc];W[sf]C[Black has one eye.
])
)
(;B[sc];W[qb];B[re];W[sf]C[Black has one eye.
])
)
(;B[sc];W[qb]
(;B[sd];W[rb];B[re];W[sf]C[Black has one eye.
])
(;B[re];W[rb];B[sd];W[sf]C[Black has one eye.
])
)
(;B[rb];W[ra];B[qa];W[qb];B[sa];W[sd]
(;B[se];W[pa];B[re];W[ra]LB[qe:A]
C[This is only ko (black has to make an approach move at A). Black can do better.
If black simply plays A white captures and black has only one eye.
])
(;B[sc];W[pa]LB[qe:A][re:B]
C[A multistep ko. Black needs two approach moves at A and B.
])
)
(;B[qb];W[sb]LB[sb:A]
C[Black looses the capturing race in the corner. Wbite A is a standard tesuji.
])
(;B[re];W[rb]
(;B[sd];W[qb]
(;B[qe];W[sf]C[Only one eye.
])
(;B[sc];W[sf]C[Only one eye.
])
)
(;B[qe];W[qb]
(;B[sd];W[sf]C[Only one eye.
])
(;B[sc];W[sb];B[sd];W[sf]C[Only one eye.
])
)
)
(;B[qe];W[rb];B[sd];W[qb]
(;B[re];W[sf]C[Only one eye.
])
(;B[sc];W[sb];B[re];W[sf]C[Only one eye.
])
)
(;B[qa];W[rb]
(;B[qb];W[sc])
(;B[sc];W[qb])
(;B[sd];W[qb])
)
(;B[sb];W[qb];B[rb];W[sd];B[ra];W[qa];B[se];W[sc])
)