I slept well today and I dreamt about a nice and hard problem. Unfortunately it was so comlpicated to give it whole on this site and there were so many vars, that I decided to use only one part of it. In my dream it was black to play problem and the goal was to put some stones in sente into white territory to make work both one sente-first-line-hane and something in the corner. After some time spending with trying to complete the whole problem, I give up and show you only the final corner part.
(;AW[rp]AW[qq]AW[pq]AW[or]AW[nq]AW[mq]AW[lp]AW[lo]AB[mp]AB[np]AB[op]AB[pp]AB[qp]AB[ro]AB[qn]AB[oq]AB[mo]AB[mn]AW[rr]C[White to play the best endgame! Sente is not important.]AW[kp]AW[ks]AW[kq]AB[lr]AW[kr]AB[pr]AW[nr]AB[sr]AB[rm]AB[so]AP[goproblems]
(;W[sq];B[qr];W[rq];B[rs]C[Ko, not very good.];W[ss]C[Bad ko.])
(;W[qs];B[sp];W[rq];B[sq]C[The R1 stone does not stand good, white still needs to protect against S1.])
(;W[ps];B[sq]C[You could do better.])
(;W[qr]C[With this move you lose one point - if you played q1, you would never have to play this. Now you will have to play q1 sometime.]))
(;W[qr];B[sp];W[rq];B[rs]C[You could do a bit better.])
(;W[ps];B[sp];W[rq];B[rs]C[You could do better.]))