(;AB[cd]AB[df]AB[ic]AW[jd]AW[jc]AB[ge]AW[hf]AW[eg]AB[cc]AW[dc]AW[ed]AB[de]AB[ee]AW[ef]AB[ff]AW[dh]AW[fh]AB[gb]AB[ib]AW[gc]AW[hc]AB[gd]AB[hd]AW[he]AW[gf]AW[id]AW[jb]AB[kd]AB[je]AB[ie]TR[gb]C[Black just played the marked stone - what should white do about it?]AB[ke]AB[lb]AB[cg]AW[dd]AB[lc]AP[goproblems] (;W[hb];B[fc] (;W[ha];B[eb]C[] (;W[db];B[fd]C[White is cut and loses everything.]) (;W[fd];B[fe] (;W[cb];B[db]C[White is cut and loses everything.]) (;W[db];B[cb] (;W[ca];B[ec]C[Black wins the race.]) (;W[da];B[ea]C[Black will win the race.]) (;W[ga] (;B[fb] (;W[da];B[ea]C[White cannot approach from either side and loses the race.]) (;W[ea]C[F18 was a mistake by black.RIGHT])) (;B[da]C[Black will capture.CHOICE]))) (;W[ec];B[db]C[Oops.])) (;W[ec];B[db]C[White loses everything.]) (;W[fe];B[fd]C[White is cut and loses everything.]) (;W[ga];B[fb] (;W[fd];B[fe] (;W[db] (;B[cb];W[ea]C[C18 was a mistake by black.RIGHT]) (;B[da]C[CHOICE] (;W[cb];B[bb];W[ca];B[ea]C[White cannot capture without self-atari and is left with nothing but ko threats.]) (;W[ec];B[cb]C[Ooops.]) (;W[fa];B[cb]C[Black wil capture.]) (;W[ea];B[fa]C[White is out of escapes.]) (;W[ca];B[ea] (;W[ec];B[cb]C[Oops.]) (;W[fa];B[ia]C[Oops.]) (;W[ia];B[cb]C[Black will capture.]) (;W[cb];B[bb]C[White cannot capture without self-atari and is left with nothing but ko threats.])))) (;W[fa];B[db]C[White is cut and loses everything.]) (;W[ea];B[db]C[White is cut and loses everything.]) (;W[ia];B[db]C[White is cut and loses everything.]) (;W[da];B[db]C[White is cut and loses everything.])) (;W[db];B[fd]C[White is cut and loses everything.]) (;W[fa];B[fd]C[White is cut and loses everything.]) (;W[ia];B[fd]C[White is cut and loses everything.]) (;W[ea];B[fd]C[White is cut and loses everything.])) (;W[fa];B[fb] (;W[fd];B[fe] (;W[db];B[ga] (;W[ia];B[cb] (;W[da];B[ea]C[One eye is just enough to win this race. White loses everything.]) (;W[ea];B[da]C[White loses everything.])) (;W[ja];B[ia]C[Oops, white loses everything.]) (;W[ec];B[ia]C[Oops, white loses everything.]) (;W[ea];B[ia]C[Oops, white loses everything.]) (;W[da];B[ia]C[Oops, white loses everything.]) (;W[cb];B[ia]C[Oops, white loses everything.])) (;W[ea];B[db]C[White is cut and loses everything.])) (;W[db];B[fd]C[White is cut and loses everything.]) (;W[ia];B[fd]C[White is cut and loses everything.]) (;W[ea];B[db]C[White is cut and loses everything.]) (;W[ga];B[fd]C[White is cut and loses everything.]))) (;W[fd];B[fe] (;W[ia];B[db]C[White can do better.]) (;W[fb];B[ha]C[Ooops. White dies.]) (;W[ha];B[db]C[White can do better than this.]) (;W[ga];B[ha]C[Ooops. White dies.]) (;W[ec];B[ha]C[White is cut and dies.])) (;W[fb];B[ha]C[White loses everything.]) (;W[ia];B[fd]C[White might live on the right, but can do better.]) (;W[ga];B[ha]C[White loses everything.]) (;W[ja];B[ha]C[White is cut and dies.])) (;W[fe];B[fd] (;W[fc];B[fe] (;W[hb]C[];B[db] (;W[ec];B[eb] (;W[fb]C[White lives, but can do better.]) (;W[ha];B[fb]C[White cannot live like this.])) (;W[fb];B[ec]C[White lives but can do better.]) (;W[ia];B[fb]C[White dies.]) (;W[eb];B[ec]C[White lives, but can do better.])) (;W[fb];B[db] (;W[ec];B[hb]C[White is too short of liberties to survive.]) (;W[hb];B[ec]C[White lives but can do better.])) (;W[ec];B[hb]C[Black will win the race and capture the marked stones.]TR[jb]TR[jc]TR[jd]TR[id]) (;W[eb];B[db];W[ec];B[hb]C[White is too short of liberties to live.]) (;W[db];B[hb]C[Black will win the race and capture the marked stones.]TR[jb]TR[jc]TR[jd]TR[id])) (;W[hb];B[fc] (;W[fb];B[ha]C[Ooops.]) (;W[ia];B[fb]C[White is cut and cannot live.]) (;W[ha];B[fb]C[White is cut and cannot live.])) (;W[ia];B[fc]C[White is cut and cannot live.]) (;W[fb];B[fc]C[White is cut and cannot live.])) (;W[fd];B[fe] (;W[hb];B[fc] (;W[ia];B[db]C[White can do better.]) (;W[fb];B[ha]C[White is cut and cannot live.]) (;W[ha];B[db]C[White can do better.])) (;W[fc];B[hb] (;W[fb];B[ja]C[Black will the race and capture the marked stones.]TR[jb]TR[jc]TR[jd]TR[id]) (;W[ia];B[fb]C[Black will win the race to capture the marked stones.]TR[jb]TR[jc]TR[jd]TR[id])) (;W[fb];B[hb] (;W[fc];B[ja]C[White loses the race.]) (;W[ga];B[fc]C[White is cut and dies.]) (;W[ia];B[fc]C[White is cut and dies.])) (;W[db];B[fc]C[White is cut and dies.]) (;W[ia];B[hb] (;W[fc];B[fb]C[Black will win the race to capture the marked stones.]TR[id]TR[jd]TR[jc]TR[jb]) (;W[fb];B[fc]C[White is cut and dies.]) (;W[ha];B[fc]C[White is cut and dies.]))) (;W[fc] (;B[hb];W[fe]C[This happened in the game and was very nice for white.RIGHT]) (;B[fe]C[CHOICE] (;W[hb]C[White will capture the marked black stones and live.RIGHT]TR[gb]TR[ib]TR[ic]) (;W[fb]TR[gb]TR[ib]TR[ic]C[White will capture the marked black stones and live.RIGHT]) (;W[fd];B[hb]C[Black will win the race and capture the marked stones. Even if the left part can live, white could do better.]TR[jb]TR[jc]TR[jd]TR[id] (;W[fb];B[ja]C[Black will the race and capture the marked stones.]TR[jb]TR[jc]TR[jd]TR[id]) (;W[ia];B[fb]C[Black will win the race to capture the marked stones.]TR[jb]TR[jc]TR[jd]TR[id])) (;W[cb];B[hb]C[Black will win the race and capture the marked stones. Even if the left part can live, white could do better.]TR[id]TR[jd]TR[jc]TR[jb]) (;W[db];B[hb]C[Black will win the race and capture the marked stones. Even if the left part can live, white could do better.]TR[id]TR[jd]TR[jc]TR[jb]) (;W[ia]C[White captures the marked black stones and lives.RIGHT]TR[ib]TR[ic]TR[gb]) (;W[ec];B[hb]TR[id]TR[jd]TR[jc]TR[jb]C[Black will win the race and capture the marked stones.]) (;W[eb];B[hb]TR[id]TR[jd]TR[jc]TR[jb]C[Black will win the race and capture the marked stones. Even if the left part can live, white could do better.]) (;W[ha]C[White captures the marked black stones and lives.RIGHT]TR[gb]TR[ib]TR[ic]) (;W[ga]C[White captures the marked black stones and lives.RIGHT]TR[gb]TR[ib]TR[ic]) (;W[ja]C[White captures the marked black stones and lives.RIGHT]TR[gb]TR[ib]TR[ic]))) (;W[fb];B[fc]C[White is cut and loses everything.]) (;W[db];B[fc]C[White is captured.]) (;W[eb];B[fc]C[White is captured.]) (;W[cb];B[fc]C[White is captured.]))