(;AB[sd]AB[rd]AB[qd]AB[oc]AB[nc]AW[rb]AW[pb]AB[nb]AB[pd]AB[mb]AB[ma]AB[pc]LB[md:NO]C[White is dead. But does White even have a ko threat here? In other words can you live if Black does not respond to your first move? Choose No if you cannot find a ko threat.FORCE]AP[goproblems]
(;W[qc];B[md]C[Black tenukies... Can you make it live?]
(;W[rc];B[qa]
(;W[pa];B[sc])
(;W[ra];B[pa];W[oa];B[ob])
(;W[sc];B[pa];W[oa];B[ob])
(;W[oa];B[sc];W[sb];B[ra])
(;W[qb];B[sc]
(;W[ra];B[sb])
(;W[sb];B[ra]))
(;W[ob];B[qb]
(;W[ra];B[sc]
(;W[pa];B[sb])
(;W[sb];B[sa]))
(;W[sc];B[ra])
(;W[pa];B[oa])))
(;W[qa];B[sb])
(;W[ob];B[sb])
(;W[sb];B[rc]
(;W[qb];B[oa];W[pa];B[ra])
(;W[qa];B[oa])
(;W[ob];B[qb]))
(;W[oa];B[sb];W[qa];B[rc])
(;W[ra];B[sb])
(;W[pa];B[sb]))
(;W[sb];B[md]C[Black tenukies... Can you make it live?]
(;W[qa];B[oa];W[qc];B[rc])
(;W[qc];B[rc]
(;W[qb];B[oa];W[pa];B[ra])
(;W[qa];B[oa])
(;W[ob];B[qb]))
(;W[qb];B[oa];W[pa];B[ra])
(;W[rc];B[qc];W[qb];B[oa];W[pa];B[ra])
(;W[ra];B[qc];W[qb];B[pa]
(;W[oa];B[ob])
(;W[ob];B[oa]))
(;W[ob];B[qb]
(;W[qc];B[rc])
(;W[qa];B[qc]))
(;W[pa];B[nd]C[Black tenukies!]
(;W[qc];B[rc]
(;W[qb];B[ra])
(;W[ra];B[qb]))
(;W[ra];B[qb])
(;W[qb];B[ra])
(;W[rc];B[qc]
(;W[qb];B[ra])
(;W[ra];B[qb]))))
(;W[qb];B[md]C[Black tenukies... Can you make it live?]
(;W[rc];B[sc];W[sb];B[oa];W[pa];B[ra])
(;W[sc];B[rc]
(;W[ob];B[sb])
(;W[sb];B[oa];W[pa];B[ra])
(;W[oa];B[ob]))
(;W[sb];B[oa];W[pa];B[ra])
(;W[ob];B[sb])
(;W[oa];B[sb]))
(;W[md]C[];B[sc]AB[rb]AB[pb]AW[ma]AW[mb]AW[nb]AW[nc]AW[oc]AW[pc]AW[pd]AW[qd]AW[rd]AW[sd]AB[rc]C[So we swap color and Black gets a free move. Still, there are 3 possible moves to kill it.]TR[rc]
(;W[qc];B[qb]
(;W[sa];B[oa]
(;W[ob]C[RIGHT])
(;W[ra];B[ob];W[qa]C[Bent 4 in the corner. Nice.RIGHT])
(;W[pa];B[ob])
(;W[na];B[ob])
(;W[qa];B[ra]))
(;W[oa];B[sa])
(;W[ra];B[sa];W[sb];B[qa])
(;W[ob];B[sa])
(;W[pa];B[qa]
(;W[sa]C[RIGHT])
(;W[oa];B[sa])
(;W[ob];B[sa]))
(;W[qa];B[pa]))
(;W[ob];B[qc]
(;W[pa];B[qa]
(;W[oa];B[sa]C[Ko])
(;W[sa];B[oa])
(;W[ra];B[oa];W[na];B[sa])
(;W[qb]C[Ko]))
(;W[qa];B[pa]
(;W[ra];B[sa]
(;W[sb]C[Ko])
(;W[oa];B[qb]))
(;W[oa];B[qb]))
(;W[ra];B[qa])
(;W[oa];B[pa]
(;W[ra];B[sa];W[sb]C[Ko])
(;W[qa];B[qb])))
(;W[qb];B[qc]
(;W[qa];B[pa])
(;W[pa];B[qa]
(;W[oa];B[sa])
(;W[sa];B[oa])
(;W[ob];B[oa]))
(;W[ra];B[qa]))
(;W[pa];B[qa]
(;W[qc];B[qb]
(;W[sa]C[RIGHT])
(;W[oa];B[sa])
(;W[ob];B[sa]))
(;W[oa];B[sa])
(;W[sa];B[ob]
(;W[oa];B[na]
(;W[qc];B[qb];W[oa]C[RIGHT])
(;W[oa];B[qc]))
(;W[qc];B[qb];W[oa];B[na];W[oa]C[RIGHT])
(;W[ra];B[oa])
(;W[qb];B[qc]))
(;W[ob];B[qc]
(;W[oa];B[sa]C[Ko])
(;W[qb]C[Ko])
(;W[ra];B[oa];W[na];B[sa])
(;W[sa];B[oa]))
(;W[qb];B[qc]
(;W[oa];B[sa])
(;W[sa];B[oa])
(;W[ob];B[oa]))
(;W[ra];B[sa]))
(;W[qa];B[pa]
(;W[qb];B[qc])
(;W[ra];B[sa];W[sb];B[qb])
(;W[qc];B[qb])
(;W[ob];B[qb]))
(;W[ra];B[qc]
(;W[pa];B[oa]
(;W[ob];B[qa];W[na];B[sa])
(;W[qa];B[qb])
(;W[qb];B[qa])
(;W[sb];B[sa]C[Ko])
(;W[sa];B[qa]))
(;W[qa];B[sa]
(;W[sb]C[Ko])
(;W[pa];B[oa]
(;W[sb]C[Ko])
(;W[ob];B[qb])
(;W[na];B[qb]))
(;W[ob];B[pa]
(;W[sb]C[Ko])
(;W[oa];B[qb]))
(;W[oa];B[pa]C[Ko]))
(;W[sb];B[sa]C[Ko])
(;W[sa];B[qa])
(;W[oa]
(;B[sa])
(;B[qa]
(;W[pa];B[sa])
(;W[sa];B[pa])))
(;W[ob];B[qa]))
(;W[oa];B[pa]
(;W[sa];B[ra])
(;W[qb];B[qc])
(;W[qa];B[ra])
(;W[ra];B[qc]
(;W[qa];B[sa]C[Ko])
(;W[sa];B[qa])
(;W[qb];B[qa])
(;W[sb];B[sa]C[Ko])
(;W[ob];B[sa];W[sb]C[Ko])))
(;W[sa]C[Brilliant!RIGHT])
(;W[sb];B[sa]))
(;W[rc];B[md]C[Black tenukies... Can you make it live?]
(;W[qc];B[qa]
(;W[pa];B[sc])
(;W[ra];B[pa];W[oa];B[ob])
(;W[sc];B[pa];W[oa];B[ob])
(;W[oa];B[sc];W[sb];B[ra])
(;W[qb];B[sc]
(;W[ra];B[sb])
(;W[sb];B[ra]))
(;W[ob];B[qb]
(;W[ra];B[sc]
(;W[pa];B[sb])
(;W[sb];B[sa]))
(;W[sc];B[ra])
(;W[pa];B[oa])))
(;W[sc];B[qc]
(;W[qb];B[pa]
(;W[oa];B[ob]
(;W[qa];B[sa])
(;W[sa];B[qa];W[ra];B[pa]))
(;W[qa];B[sa]
(;W[oa];B[ob])
(;W[ob];B[oa];W[na];B[oa]))
(;W[sa];B[qa]
(;W[oa];B[ob];W[ra];B[pa])
(;W[ob];B[oa]))
(;W[ob];B[oa]
(;W[sa];B[qa])
(;W[qa];B[sa];W[na];B[oa])))
(;W[ob];B[qb])
(;W[sa];B[qb]))
(;W[qb];B[sc];W[sb];B[oa];W[pa];B[ra])
(;W[ob];B[qc]
(;W[sc];B[qb])
(;W[qb];B[sc];W[sb];B[oa];W[pa];B[ra])
(;W[oa];B[qb]))
(;W[sb];B[qc];W[qb];B[oa];W[pa];B[ra])
(;W[ra];B[qc]
(;W[qb];B[pa]
(;W[ob];B[oa])
(;W[oa];B[ob]))
(;W[ob];B[qb])
(;W[pa];B[qb]))
(;W[qa];B[qc])
(;W[pa];B[qc];W[qb];B[sc];W[sb];B[ra]))
(;W[oa];B[md]C[Black tenukies... Can you make it live?]
(;W[rc];B[qc]
(;W[qb];B[sc]
(;W[sb];B[ra]
(;W[qa];B[ob])
(;W[ob];B[qa]))
(;W[ob];B[sb]))
(;W[sc];B[qb])
(;W[ob];B[qb]))
(;W[qc];B[sb];W[qa];B[rc])
(;W[qb];B[sb])
(;W[sb];B[qb]
(;W[qa];B[qc])
(;W[qc];B[rc]))
(;W[ra];B[sb])
(;W[qa];B[qc]))
(;W[ra];B[md]C[Black tenukies... Can you make it live?]
(;W[sb];B[qc];W[qb];B[pa]
(;W[oa];B[ob])
(;W[ob];B[oa]))
(;W[qc];B[sb])
(;W[sc];B[qc];W[qb];B[pa];W[ob];B[oa])
(;W[qb];B[sb])
(;W[rc];B[qc]
(;W[qb];B[pa]
(;W[ob];B[oa])
(;W[oa];B[ob]))
(;W[ob];B[qb])
(;W[pa];B[qb]))
(;W[ob];B[sb])
(;W[pa];B[sb]))
(;W[ob];B[md]C[Black tenukies... Can you make it live?]
(;W[qc];B[sb])
(;W[sb];B[qb]
(;W[qc];B[rc])
(;W[qa];B[qc]))
(;W[qb];B[sb])
(;W[rc];B[qc]
(;W[sc])
(;W[qb];B[sc];W[sb];B[oa];W[pa];B[ra])
(;W[oa];B[qb]))
(;W[sc];B[qb])
(;W[ra];B[sb])
(;W[oa];B[qb])
(;W[qa];B[qc]
(;W[qb];B[oa])
(;W[oa];B[qb])))
(;W[sc];B[md]C[Black tenukies... Can you make it live?]
(;W[qc];B[rc]
(;W[qa];B[sb])
(;W[qb];B[sb])
(;W[sb];B[qb])
(;W[pa];B[qb]))
(;W[rc];B[qc]
(;W[qb];B[pa]
(;W[oa];B[ob]
(;W[qa];B[sa])
(;W[sa];B[qa];W[ra];B[pa]))
(;W[qa];B[sa]
(;W[oa];B[ob])
(;W[ob];B[oa];W[na];B[oa]))
(;W[sa];B[qa]
(;W[oa];B[ob])
(;W[ob];B[oa]))
(;W[ob];B[oa]
(;W[sa];B[qa])
(;W[qa];B[sa])))
(;W[ob];B[qb])
(;W[sa];B[qb]))
(;W[qb];B[rc]
(;W[ob];B[sb])
(;W[sb];B[oa];W[pa];B[ra])
(;W[oa];B[ob]))
(;W[ob];B[qb])
(;W[ra];B[qc];W[qb];B[pa];W[ob];B[oa])
(;W[pa];B[qb])
(;W[sa];B[qb])
(;W[oa];B[qb])
(;W[qa];B[qc]))
(;W[qa];B[md]C[Black tenukies... Can you make it live?]
(;W[ob];B[sb];W[rc];B[sc]
(;W[qc];B[oa])
(;W[oa];B[qc]))
(;W[qc];B[sb])
(;W[sb];B[oa];W[qc];B[rc])
(;W[rc];B[qc])
(;W[sc];B[qc])
(;W[oa];B[qc]))
(;W[pa];B[sb]))