Problem 1434's defense is not optimal. Can you do better? There are no big ko threats.
(;AB[sd]AB[rd]AB[qd]AB[qe]AB[pe]AB[pc]AB[nd]AB[md]AB[ld]AB[me]AB[kc]AB[kb]AB[la]AB[mb]AB[oc]AW[se]AW[re]AW[qf]AW[rg]AW[rh]AW[sh]AW[pf]AW[oe]AW[od]AW[pd]AW[ne]AW[mf]AW[le]AW[kd]AW[ke]AW[je]AW[jc]AW[jb]AW[ja]AW[ka]AW[kf]AW[qc]C[White to play.]SZ[19]AB[rc]
(;W[qb];B[rb]
(;W[nc]
(;B[pb]C[MoreKnock's variationCHOICE]
(;W[mc];B[nb]
(;W[lc];B[lb]C[Black gets only 6 points from the corner, loss included. Best result for both.RIGHT])
(;W[lb];B[lc])
(;W[qa];B[lc])
(;W[pa];B[lc])
(;W[ma];B[lc]C[Ko for just a few points]))
(;W[nb];B[mc]
(;W[na];B[oa])
(;W[oa];B[qa];W[ma];B[na]C[Ko, and Black can cut the losses anyway by playing P18 instead of ko.])
(;W[lb];B[na]
(;W[lc];B[ob])
(;W[ma];B[ob])))
(;W[lc];B[mc]
(;W[lb];B[na]C[About 3 points worse than possible.])
(;W[nb]
(;B[lb]
(;W[oa];B[qa];W[ma];B[na]C[Ko])
(;W[na];B[oa])
(;W[ob];B[qa])
(;W[qa];B[na])
(;W[pa];B[qa]))
(;B[na]C[If Black does not want to fight the ko this will still be worse for White than the solution.]))
(;W[na];B[lb];W[nb];B[oa]))
(;W[lb];B[lc])
(;W[ob];B[qa]
(;W[mc];B[nb]
(;W[lc];B[lb]C[Black gets only 6 points from the corner, loss included.RIGHT])
(;W[lb];B[lc]))
(;W[nb];B[mc])
(;W[lc];B[mc]
(;W[lb];B[na]C[About 3 points worse than the solution.])
(;W[na];B[lb]))
(;W[lb];B[lc]))
(;W[qa];B[mc]))
(;B[mc]C[Black wants to save it all, now make him pay for it.CHOICE]
(;W[ob];B[nb]
(;W[pb];B[nc]
(;W[ra];B[qa]
(;W[pa];B[sb]
(;W[lb];B[lc];W[na]C[Gote seki. Black was a bit greedy and pays for it.RIGHT])
(;W[na];B[ma]
(;W[lb];B[oa]C[Ko, Black takes first. Just capturing those two stones is not enough.]TR[kb]TR[kc])
(;W[lc];B[oa]C[Ko, Black takes first. Just capturing those two stones is not enough.]TR[kb]TR[kc]))
(;W[lc];B[lb];W[na]C[Gote seki. Black was a bit greedy and pays for it.RIGHT]))
(;W[sb];B[sa]C[Ko, Black takes first. You have no big threats, remember.])
(;W[na];B[sa]
(;W[oa];B[ma]C[2 stones are not enough.])
(;W[lb];B[oa]
(;W[ma];B[pa]C[Just a tiny reduction.])
(;W[lc];B[pa]C[Black gets about 9 points from the corner, levelling out White's gain.])
(;W[pa]
(;B[lc]
(;W[ra];B[of]C[Err...]
(;W[nf];B[qa]C[Ko, Black takes first.])
(;W[sb];B[nf]))
(;W[sb];B[oa]))
(;B[oa]C[If Black really does not like the ko this reduces the loss anyway.]))
(;W[sb];B[lc]))
(;W[lc];B[oa]
(;W[lb];B[pa]C[Black gets about 9 points from the corner, levelling out White's gain.])
(;W[pa];B[lb]
(;W[ra];B[of]C[Whoops!]
(;W[nf];B[qa]C[Ko, Black takes first.])
(;W[sb];B[nf]))
(;W[sb];B[oa]))
(;W[sb];B[lb]))
(;W[sb];B[pa]))
(;W[oa];B[na])
(;W[lb];B[oa]C[Just 2 stones.])
(;W[lc];B[oa]C[Only 2 stones.]))
(;W[sb];B[ra]
(;W[na];B[qa])
(;W[lb];B[lc];W[na];B[qa])
(;W[lc];B[lb];W[na];B[qa]))
(;W[na];B[ra]
(;W[lb];B[lc]
(;W[oa];B[qa])
(;W[sb];B[qa]))
(;W[lc];B[lb]
(;W[oa];B[qa])
(;W[sb];B[qa])))
(;W[lb];B[oa]C[2 stones is not enough.])
(;W[lc];B[oa]C[2 stones is not enough.])
(;W[oa];B[na])
(;W[qa];B[ra])
(;W[pa];B[ra]))
(;W[ra];B[pb])
(;W[pa];B[ra])
(;W[oa];B[pb])
(;W[qa];B[pb])
(;W[lb];B[pb]C[2 stones is not enough.])
(;W[lc];B[pb]C[2 stones is not enough.])
(;W[sb];B[pb]))
(;W[nb];B[ob]
(;W[ra];B[sb]
(;W[na];B[pa]
(;W[qa];B[ma]C[2 stones is not enough.]TR[kc]TR[kb])
(;W[lb];B[oa]
(;W[lc];B[ma]C[2 stones is not enough.])
(;W[ma];B[la]C[2 stones is not enough.])
(;W[qa];B[ma]C[2 stones is not enough.]))
(;W[lc];B[oa]
(;W[lb];B[ma]C[2 stones is not enough.])
(;W[qa];B[ma]C[2 stones is not enough.])))
(;W[qa];B[pa]
(;W[na];B[ma]C[2 stones is not enough.]TR[kc]TR[kb])
(;W[lb];B[na]C[2 stones is not enough.])
(;W[lc];B[na]C[2 stones is not enough.]))
(;W[pb];B[na])
(;W[pa];B[na])
(;W[oa];B[na])
(;W[lb];B[na]C[2 stones is not enough.])
(;W[lc];B[lb]))
(;W[na];B[qa])
(;W[qa];B[pa]
(;W[na];B[ra])
(;W[ra];B[sb]
(;W[na];B[ma]C[2 stones is not enough.]TR[kc]TR[kb])
(;W[lb];B[na]C[2 stones is not enough.])
(;W[lc];B[na]C[2 stones is not enough.]))
(;W[lb];B[na]C[2 stones is not enough.])
(;W[lc];B[na]C[2 stones is not enough.]))
(;W[pa];B[na])
(;W[lb];B[lc])
(;W[lc];B[lb])
(;W[oa];B[na])
(;W[sb];B[qa]))
(;W[pb];B[ob])
(;W[qa];B[ra]
(;W[ob];B[nb];W[pb];B[nc])
(;W[pb];B[ob])
(;W[nb];B[ob])
(;W[oa];B[ob])
(;W[pa];B[oa]))
(;W[pa]
(;B[ob];W[oa];B[na];W[ra];B[sb])
(;B[nb]))
(;W[oa];B[ob]
(;W[pa];B[na];W[ra];B[sb])
(;W[na];B[pa]
(;W[qa];B[ra])
(;W[ra];B[pb])
(;W[nb];B[ma]))
(;W[ra];B[sb];W[pa];B[na]))
(;W[lb];B[nb]C[2 stones is not enough.])
(;W[lc];B[nb]C[2 stones is not enough.]))
(;B[nb]
(;W[lc];B[mc]C[That's just 2 stones.])
(;W[ob];B[mc]
(;W[lb];B[pb]C[2 stones is not enough.])
(;W[lc];B[pb]C[2 stones is not enough.])
(;W[na])
(;W[pb];B[nc]
(;W[ra];B[qa]
(;W[pa];B[sb]
(;W[lb];B[lc];W[na]C[Gote seki. Black was a bit greedy and pays for it.RIGHT])
(;W[na];B[ma]
(;W[lb];B[oa]C[Ko, Black takes first. Just capturing those two stones is not enough.]TR[kb]TR[kc])
(;W[lc];B[oa]C[Ko, Black takes first. Just capturing those two stones is not enough.]TR[kb]TR[kc]))
(;W[lc];B[lb];W[na]C[Gote seki. Black was a bit greedy and pays for it.RIGHT]))
(;W[sb];B[sa]C[Ko, Black takes first. You have no big threats, remember.])
(;W[na];B[sa]
(;W[oa];B[ma]C[2 stones are not enough.])
(;W[lb];B[oa]
(;W[ma];B[pa]C[Just a tiny reduction.])
(;W[lc];B[pa]C[Black gets about 9 points from the corner, levelling out White's gain.])
(;W[pa]
(;B[lc]
(;W[ra];B[of]C[Err...]
(;W[nf];B[qa]C[Ko, Black takes first.])
(;W[sb];B[nf]))
(;W[sb];B[oa]))
(;B[oa]C[If Black really does not like the ko this reduces the loss anyway.]))
(;W[sb];B[lc]))
(;W[lc];B[oa]
(;W[lb])
(;W[pa];B[lb]
(;W[ra];B[of]C[Whoops!]
(;W[nf];B[qa]C[Ko, Black takes first.])
(;W[sb];B[nf]))
(;W[sb];B[oa]))
(;W[sb];B[lb]))
(;W[sb];B[pa]))
(;W[oa];B[na])
(;W[lb];B[oa]C[Just 2 stones.])
(;W[lc];B[oa]C[Only 2 stones.]))
(;W[sb];B[ra]
(;W[na];B[qa])
(;W[lb];B[lc];W[na];B[qa])
(;W[lc];B[lb];W[na];B[qa]))
(;W[na];B[ra]
(;W[lb];B[lc]
(;W[oa];B[qa])
(;W[sb]))
(;W[lc];B[lb]
(;W[oa];B[qa])
(;W[sb])))
(;W[lb];B[oa]C[2 stones is not enough.])
(;W[lc];B[oa]C[2 stones is not enough.])
(;W[oa];B[na])
(;W[qa];B[ra])
(;W[pa];B[ra]))
(;W[oa];B[pb])
(;W[pa];B[ra])
(;W[qa];B[pb])
(;W[ra];B[pb])
(;W[sb];B[pb]))))
(;W[lc];B[mc]C[2 stones is not enough.])
(;W[lb];B[lc]
(;W[nc];B[pb])
(;W[ob];B[pb]))
(;W[ob];B[nc]
(;W[pb];B[nb]
(;W[ra];B[sb]
(;W[na];B[lc])
(;W[lc];B[qa]
(;W[pa]
(;B[na];W[lb];B[oa])
(;B[oa];W[na];B[ma]))
(;W[na];B[pa]
(;W[oa];B[qa])
(;W[lb];B[oa]))
(;W[oa];B[na]))
(;W[qa];B[oa]
(;W[na];B[lc])
(;W[lc];B[na];W[lb];B[pa]C[Just capturing those two stones is not enough.])))
(;W[lc];B[oa]C[Black lives with points])
(;W[na];B[lc]))
(;W[lc];B[pb]C[Black lives with points])
(;W[nb];B[pb]))
(;W[pb];B[ob])
(;W[nb];B[nc]
(;W[pb];B[ob])
(;W[ob];B[pb])
(;W[lc];B[lb]))
(;W[ra];B[pb]
(;W[nc];B[mc])
(;W[lc];B[lb];W[nc];B[mc]))
(;W[qa];B[pb]
(;W[nc];B[mc])
(;W[ra];B[pa])
(;W[pa];B[nc])
(;W[lc];B[lb]
(;W[nc];B[mc])
(;W[pa];B[nc])))
(;W[mc];B[nc]))
(;W[rb];B[qb])
(;W[nc]
(;B[qb]C[CHOICE]
(;W[lc];B[mc]C[2 stones is not enough.])
(;W[mc];B[nb]C[]
(;W[lc];B[lb]C[Right, after losses Black keeps 6 points.RIGHT])
(;W[lb];B[lc]))
(;W[nb];B[mc])
(;W[lb];B[lc])
(;W[ob];B[mc]))
(;B[mc]C[Black wants to save all, now make him pay for it.CHOICE]
(;W[qb];B[rb]
(;W[lc];B[nb]C[2 stones is not enough.])
(;W[lb];B[nb]C[2 stones is not enough.])
(;W[nb];B[ob]
(;W[ra];B[sb]
(;W[na];B[pa]
(;W[qa];B[ma]C[2 stones is not enough.]TR[kc]TR[kb])
(;W[lb];B[oa]
(;W[lc];B[ma]C[2 stones is not enough.])
(;W[ma];B[la]C[2 stones is not enough.])
(;W[qa];B[ma]C[2 stones is not enough.]))
(;W[lc];B[oa]
(;W[lb])
(;W[qa];B[ma]C[2 stones is not enough.])))
(;W[qa];B[pa]
(;W[na])
(;W[lb];B[na]C[2 stones is not enough.])
(;W[lc];B[na]C[2 stones is not enough.]))
(;W[pb];B[na])
(;W[pa];B[na])
(;W[oa];B[na])
(;W[lb];B[na]C[2 stones is not enough.])
(;W[lc];B[lb]))
(;W[na];B[qa])
(;W[qa];B[pa]
(;W[na];B[ra])
(;W[ra];B[sb]
(;W[na])
(;W[lb])
(;W[lc]))
(;W[lb];B[na]C[2 stones is not enough.])
(;W[lc];B[na]C[2 stones is not enough.]))
(;W[pa];B[na])
(;W[lb];B[lc])
(;W[lc];B[lb])
(;W[oa];B[na])
(;W[sb];B[qa]))
(;W[ob];B[nb]
(;W[pb];B[nc]
(;W[ra];B[qa]
(;W[pa];B[sb]
(;W[lb];B[lc];W[na]C[Gote seki. Black was a bit greedy and pays for it.RIGHT])
(;W[na];B[ma]
(;W[lb];B[oa]C[Ko, Black takes first. Just capturing those two stones is not enough.]TR[kb]TR[kc])
(;W[lc];B[oa]C[Ko, Black takes first. Just capturing those two stones is not enough.]TR[kb]TR[kc]))
(;W[lc];B[lb];W[na]C[Gote seki. Black was a bit greedy and pays for it.RIGHT]))
(;W[sb];B[sa]C[Ko, Black takes first. You have no big threats, remember.])
(;W[na];B[sa]
(;W[oa];B[ma]C[2 stones are not enough.])
(;W[lb];B[oa]
(;W[ma];B[pa]C[Just a tiny reduction.])
(;W[lc];B[pa]C[Black gets about 9 points from the corner, levelling out White's gain.])
(;W[pa]
(;B[lc]
(;W[ra];B[of]C[Err...]
(;W[nf];B[qa]C[Ko, Black takes first.])
(;W[sb];B[nf]))
(;W[sb];B[oa]))
(;B[oa]C[If Black really does not like the ko this reduces the loss anyway.]))
(;W[sb];B[lc]))
(;W[lc];B[oa]
(;W[lb])
(;W[pa];B[lb]
(;W[ra];B[of]C[Whoops!]
(;W[nf];B[qa]C[Ko, Black takes first.])
(;W[sb];B[nf]))
(;W[sb];B[oa]))
(;W[sb];B[lb]))
(;W[sb];B[pa]))
(;W[oa];B[na])
(;W[lb];B[oa]C[Just 2 stones.])
(;W[lc];B[oa]C[Only 2 stones.]))
(;W[sb];B[ra]
(;W[na];B[qa])
(;W[lb];B[lc];W[na];B[qa])
(;W[lc];B[lb];W[na];B[qa]))
(;W[na];B[ra]
(;W[lb];B[lc]
(;W[oa];B[qa])
(;W[sb]))
(;W[lc];B[lb]
(;W[oa];B[qa])
(;W[sb])))
(;W[lb];B[oa]C[2 stones is not enough.])
(;W[lc];B[oa]C[2 stones is not enough.])
(;W[oa];B[na])
(;W[qa];B[ra])
(;W[pa];B[ra]))
(;W[ra];B[pb])
(;W[pa];B[ra])
(;W[oa];B[pb])
(;W[qa];B[pb])
(;W[lb];B[pb]C[2 stones is not enough.])
(;W[lc];B[pb]C[2 stones is not enough.])
(;W[sb];B[pb]))
(;W[pb];B[ob])
(;W[qa];B[ra]
(;W[ob];B[nb];W[pb];B[nc])
(;W[pb];B[ob])
(;W[nb];B[ob])
(;W[oa];B[ob])
(;W[pa];B[oa]))
(;W[pa]
(;B[ob];W[oa];B[na];W[ra];B[sb])
(;B[nb]))
(;W[oa];B[ob]
(;W[pa])
(;W[na];B[pa]
(;W[qa];B[ra])
(;W[ra];B[pb])
(;W[nb];B[ma]))
(;W[ra];B[sb];W[pa];B[na])))
(;W[pb];B[qb])
(;W[ob];B[qb])
(;W[nb];B[qb])))
(;W[lc];B[mc]C[2 stones are not enough.])
(;W[lb];B[lc]
(;W[qb];B[rb]
(;W[nc];B[pb])
(;W[ob];B[pb]))
(;W[nc];B[qb]))
(;W[nb];B[qb])
(;W[ob];B[qb]
(;W[lc];B[lb];W[nc];B[mc])
(;W[nc];B[mc])
(;W[lb];B[lc])
(;W[mc];B[lc])
(;W[nb];B[nc]))
(;W[mc];B[nc]))