This one has a little story... Which I could avoid posting, but...
I saw a somewhat similar position a couple of days ago in a game and thought of posting it but it was side-based so the solution wasn't as nice. Playing around with it a bit, I got tired and threw it away to the one-day-I'll-make-problems-out-of-these archive...
2 days ago, the free weekly lecture held by MingJiu7p (They alternate with GuoJuan5p) on kgs, opened with this position! Well naturally seeing how nice it works by the corner, I couldn't ressist but to post it... Enjoy! =)
(;AW[cc]AW[ce]AW[cd]AW[ed]AW[ee]AW[gd]AW[gc]AW[hc]AW[ic]AW[ib]AB[hb]AB[gb]AB[fa]AB[fc]AB[ec]AB[dc]C[White moves and wipes black off the board, right? ;)]AP[goproblems]
(;W[eb];B[cb]
(;W[bb];B[ba]
(;W[db];B[da]C[So it's a ko? Playing at C19 means you think it's a ko. :)]
(;W[ac];B[ha]C[So it's a ko? Playing at C19 means you think it's a ko. :)]
(;W[aa];B[ab]MA[aa];W[ca]C[Well done! Double ko! :)RIGHT]MA[cb])
(;W[ca]C[Incredibly close but not a ko.]MA[cb]))
(;W[ca]MA[cb]C[Incredibly close but not a ko.])
(;W[ha];B[bc];W[ca]MA[cb]C[:(])
(;W[ab];B[bc]
(;W[ca]MA[cb]C[:(])
(;W[ac];B[ha]
(;W[ca]C[:(]MA[cb])
(;W[bd];B[ea];W[ca]MA[cb]C[:(]))
(;W[bd];B[ha]
(;W[ca]C[:(]MA[cb])
(;W[ac];B[ea];W[ca]C[:(]MA[cb]))
(;W[ha];B[ac];W[ca]MA[cb]C[:(])
(;W[ad];B[ha]
(;W[ca]C[:(]MA[cb])
(;W[bd];B[ea]
(;W[ca]MA[cb]C[:(])
(;W[ac];B[ca]C[:(]))
(;W[ac];B[ea]
(;W[ca]C[:(]MA[cb])
(;W[bd];B[ca]C[:(])))))
(;W[ac];B[ha];W[db];B[da]C[So it's a ko? Playing at C19 means you think it's a ko. :)]
(;W[aa];B[ab]MA[aa];W[ca]MA[cb]C[Well done! A double ko! :)RIGHT])
(;W[ca]MA[cb]C[Incredibly close but not a ko.]))
(;W[bc];B[ha];W[db];B[da];W[ca]MA[cb]C[:(])
(;W[ab];B[bc]
(;W[db];B[da]
(;W[ha];B[ac];W[ca]MA[cb]C[:(])
(;W[ac];B[ha]
(;W[ca]C[:(]MA[cb])
(;W[bd];B[ea];W[ca]C[:(]MA[cb]))
(;W[bd];B[ha]
(;W[ca]C[:(]MA[cb])
(;W[ac];B[ea];W[ca]MA[cb]C[:(]))
(;W[ad];B[ha]
(;W[ca]C[:(]MA[cb])
(;W[ac];B[ea];W[ca]C[:(]MA[cb])
(;W[bd];B[ea];W[ca]C[:(]MA[cb])))
(;W[bd];B[ha]
(;W[db];B[da];W[ca]C[:(]MA[cb])
(;W[fb];B[db]C[:(])
(;W[da];B[db]C[:(])
(;W[ac];B[db]C[:(]))
(;W[ac];B[ha]
(;W[db];B[da];W[ca]C[:(]MA[cb])
(;W[fb];B[db]C[:(])
(;W[da];B[db]C[:(])
(;W[bd];B[db]C[:(]))
(;W[ha];B[ac]
(;W[db];B[da];W[ca]C[:(]MA[cb])
(;W[da];B[db]C[:(])))
(;W[ha];B[bc]
(;W[fb];B[db]
(;W[ga];B[ab]C[:(])
(;W[ab];B[ea]C[:(]))
(;W[db]
(;B[ab]C[Or ko with D19 instead... :(])
(;B[da]
(;W[ca]C[:(]MA[cb])
(;W[ab];B[ac];W[ca]C[:(]MA[cb])))
(;W[ab]C[];B[ac];W[db];B[da];W[ca]MA[cb]C[:(])))
(;W[ha];B[bc]
(;W[ba];B[db]C[]
(;W[ea];B[ca]C[:(])
(;W[ca];B[da]C[:(])
(;W[bb];B[ca]TR[ac]TR[ea]C[:(]))
(;W[ab];B[ba]
(;W[db];B[da];W[bb];B[ac];W[ca]MA[cb]C[:(])
(;W[fb];B[db];W[ga];B[da]C[:(])
(;W[bb];B[ac]
(;W[db];B[da];W[ca]MA[cb]C[:(])
(;W[fb];B[db];W[ga];B[da]C[:(])
(;W[da];B[db]C[:(]))
(;W[da];B[db]C[:(]))
(;W[fb];B[db];W[ga];B[ba]C[:(]TR[da]TR[ab])
(;W[db];B[da]
(;W[bb];B[ba]
(;W[ab];B[ac];W[ca]MA[cb]C[:(])
(;W[ca]MA[cb]C[:(]))
(;W[ab];B[bb]C[:(])
(;W[ba];B[bb]C[:(]))
(;W[bb];B[ba]
(;W[db];B[da]
(;W[ca]MA[cb]C[:(])
(;W[ab];B[ac];W[ca]C[:(]MA[cb]))
(;W[ab];B[ac]
(;W[db];B[da];W[ca]C[:(]MA[cb])
(;W[fb];B[db];W[ga];B[da]C[:(])
(;W[da];B[db]C[:(]))))
(;W[fb];B[db]C[:(])
(;W[db];B[bb]
(;W[fb];B[da]C[:(])
(;W[ha];B[da]C[:(])))
(;W[ha];B[cb]
(;W[bb];B[eb]
(;W[ca];B[da];W[db]MA[cb]C[:(])
(;W[da];B[ca]C[:(]))
(;W[eb];B[bc]
(;W[db];B[da];W[bb];B[ba]
(;W[ca]MA[cb]C[:(])
(;W[ab];B[ac];W[ca]C[:(]MA[cb]))
(;W[bb];B[ba]
(;W[db];B[ab]C[:(])
(;W[ab];B[ac]
(;W[db];B[da];W[ca]C[:(]MA[cb])
(;W[fb];B[db];W[ga];B[da]C[:(])))
(;W[ba];B[db]
(;W[ea];B[ca]C[:(])
(;W[ca];B[da]C[:(])
(;W[bb];B[ca]TR[ea]TR[ac]C[:(]))
(;W[ab];B[ba]
(;W[bb];B[ac];W[db];B[da];W[ca]C[:(]MA[cb])
(;W[db];B[da];W[bb];B[ac];W[ca]MA[cb]C[:(])
(;W[fb];B[db];W[ga];B[da]C[:(])
(;W[da];B[db]C[:(]))
(;W[fb];B[db];W[ga];B[ba]C[:(]TR[da]TR[ab])))
(;W[db];B[eb]
(;W[ca];B[ha];W[ea];B[da]MA[ea]C[:(])
(;W[ha];B[cb]C[:(])
(;W[cb];B[ha]C[:(])
(;W[bb];B[ha]C[:(]))
(;W[cb];B[ha]
(;W[da];B[ea]C[Thanks to the extra two liberties, wE18 doesn't work! :)]MA[dd]MA[fd]MA[eb])
(;W[db];B[eb]C[:(])
(;W[eb];B[db]C[:(]))
(;W[ca];B[ha]
(;W[db];B[eb];W[ea];B[da]MA[ea]C[:(])
(;W[ea];B[db]
(;W[da];B[cb];W[bb];B[ba];W[aa];B[eb]C[:(])
(;W[cb];B[da]C[:(]))
(;W[da];B[ea]C[:(])
(;W[eb];B[db]C[:(]))
(;W[da];B[ha]TR[ea]TR[cb]C[:(])
(;W[bb];B[ha]
(;W[db];B[eb]C[:(])
(;W[da];B[eb]C[:(])
(;W[eb];B[db]C[:(])))