(;AW[bd]AW[cd]AW[ad]AB[dd]AB[cc]AB[bc]AB[db]AB[ce]AB[be]AB[df]AB[cg]AB[bg]AB[ag]AB[dg]AW[de]AW[ee]AW[fe]AW[fc]AW[dc]C[Black just played at A - How to respond? :)]LB[db:A]AW[gc]AW[gb]AW[hb]AW[ha]AP[goproblems] (;W[ec]C[This is wrong, as it leaves another 'Pushing point' for black.];B[ac] (;W[ed];B[ba] (;W[bb] (;B[ab]C[Black's alive!CHOICE]) (;B[cb]C[Black's alive!CHOICE]LB[ab:A]LB[da:B]LB[eb:C])) (;W[ab];B[bb]C[Black's alive!CHOICE]) (;W[ca] (;B[cb]C[Black's alive!CHOICE]LB[ab:A]LB[da:B]LB[eb:C]) (;B[ab]C[Black's alive!CHOICE])) (;W[da];B[eb] (;W[fb] (;B[cb]C[Black's alive!CHOICE]LB[ab:A]LB[ea:B]) (;B[ea]C[Black's alive!CHOICE])) (;W[cb];B[ca]C[Black's alive!CHOICE]LB[ab:A]LB[bb:B]LB[ea:C]LB[fb:D]) (;W[bb] (;B[cb]C[Black's alive!CHOICE]LB[ab:A]LB[ea:B]LB[fb:C]) (;B[ca]C[Black's alive!CHOICE]LB[ab:A]LB[ea:B]LB[fb:C])) (;W[ca] (;B[cb]C[Black's alive!CHOICE]LB[ab:A]LB[ea:B]LB[fb:C]) (;B[bb]C[Black's alive!CHOICE]LB[ea:A]LB[fb:B])) (;W[ab] (;B[bb]C[Black's alive!CHOICE]LB[ca:A]LB[ea:B]LB[fb:C]) (;B[cb]C[Black's alive!CHOICE]LB[ea:A]LB[fb:B]))) (;W[cb];B[ca]LB[ab:A]LB[bb:B]C[Black's alive!CHOICE]) (;W[eb];B[da]C[Black's alive!]) (;W[ea] (;B[da]C[Black's alive!]) (;B[eb];W[cb] (;B[ca]C[Black's alive!CHOICE]LB[ab:A]LB[bb:B]) (;B[bb]C[Black's alive!CHOICE]LB[ca:A]LB[da:B]LB[fa:C]))) (;W[aa] (;B[ab]C[Black's alive!CHOICE]) (;B[eb];W[bb];B[ca]C[Black's alive!CHOICE]LB[ab:A]LB[ea:B]))) (;W[ba];B[ae];W[cb];B[bb];W[da];B[ca]C[Ko for the rest of the corner.. :)]MA[cb];W[cb]C[NOTTHIS])) (;W[ed]C[Correct! There's no need for a 'safe eye' or building walls or anything at all - AND it doesn't let black to have a 'Pushing point' at A17, which'd give him the corner! (I made 4 tsumego problems to show that black can't live in the corner as it is. The best possible resualt, for black now, would be a ko, with white takking first, if he goes for D. - Thanks to DrStraw for this variation!)RIGHT]LB[ab:A]LB[ac:B]LB[ba:C]LB[bb:D]) (;W[ac];B[ab]C[Black gets the corner.]) (;W[bb];B[ec];W[ac];B[ab];W[aa];B[ae];W[ab];B[cb]C[Black gets the corner.]) (;W[cb];B[ec];W[bb];B[ac]C[Black gets the corner.]) (;W[eb];B[ec]C[Black gets the corner.]) (;W[ab];B[ec];W[ac];B[bb]C[Black gets the corner.]))