Problem 14528 goproblems.com


Author	BartTM	Created	2011-02-03
Difficulty	10 kyu (history)	Source	Problem 14493
AVG solve time	92 sec	Stars	3.91 (11 votes)
User attempts	873 / 2330	Collections	N/A
Genre	life and death ⓒ	Your attempts	N/A
Similar problems
Created	2011-02-03
Source	Problem 14493
Stars	3.91 (11 votes)
Collections	N/A
Your attempts	N/A

(;AB[ba]AB[ab]AW[bb]AB[bc]AB[cc]AB[cd]AB[dd]AB[ed]AB[fd]AB[gd]AB[fc]AB[fb]AB[ic]AB[hc]AW[cb]AW[dc]AW[ec]AW[eb]AW[da]AW[ea]AW[fa]AW[gb]AW[gc]AW[bd]AW[be]AW[cf]AW[df]AW[ef]AW[fe]AW[ge]AW[he]AW[hd]MA[fe]C[If White takes a liberty instead of fighting a difficult ko at C19, what can Black do?]AP[goproblems] (;B[ac] (;W[ce] (;B[aa];W[ad] (;B[ca];W[ee] (;B[db];W[cb] (;B[hb];W[ga] (;B[ha]C[Taking the liberty at C19 before taking the outside liberty is the key to this problem.RIGHT]TR[ca]TR[ac]TR[aa]) (;B[bb];W[de])) (;B[bb];W[de]) (;B[ha];W[de]) (;B[ga];W[ha] (;B[ia];W[de]) (;B[hb]C[];W[ia] (;B[ja];W[jb] (;B[ga];W[gb] (;B[gc];W[jc]C[White escapes with ko.]) (;B[ib];W[ka]C[White escapes.]) (;B[ka];W[kb]C[White escapes.])) (;B[ib];W[ka]C[White escapes.]) (;B[jc];W[ga]C[Black dies.])) (;B[ga];W[gb] (;B[gc];W[jb]C[White escapes with ko.]) (;B[jb]C[This will probably be enough to capture White.RIGHT]) (;B[kb]C[Capturing White the long way.RIGHT]) (;B[ib];W[jb]C[White escapes.]) (;B[ja];W[jb] (;B[gc];W[jc]C[White escapes with ko.]) (;B[ib];W[ka]C[White escapes.]) (;B[ka];W[kb]C[White escapes.])) (;B[ka];W[jb]C[White escapes.])) (;B[jb];W[ga]) (;B[ib];W[jb]C[White escapes.])) (;B[bb];W[de]))) (;B[hb];W[de]) (;B[ga];W[de]) (;B[ha];W[de])) (;B[hb];W[ga] (;B[ca];W[ee] (;B[db];W[cb] (;B[ha]C[Taking the liberty at C19 before taking the outside liberty is the key to this problem.RIGHT]TR[ca]TR[ac]TR[aa]) (;B[bb];W[de])) (;B[ha];W[de])) (;B[ha];W[ee] (;B[ca];W[de]) (;B[jd];W[de]))) (;B[ha];W[hb] (;B[ib];W[ga] (;B[ia];W[ee]) (;B[ca];W[ia] (;B[db];W[cb] (;B[ja];W[ee] (;B[ha]C[Just ko.]) (;B[bb];W[de])) (;B[bb];W[ee]C[Ko]) (;B[ee];W[de]) (;B[de];W[ee])) (;B[ja];W[ee] (;B[db];W[cb] (;B[ha]C[Just ko.]) (;B[bb];W[de])) (;B[ha];W[de])) (;B[ee];W[de]) (;B[de];W[ee]))) (;B[ca];W[ib]C[White escapes.])) (;B[ga];W[ha] (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]) (;B[hb];W[ga] (;B[ia];W[ee]) (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.])) (;B[ia];W[ee] (;B[ca];W[de]) (;B[hb];W[ga])))) (;B[hb];W[ga] (;B[aa];W[ad] (;B[ca];W[ee] (;B[db];W[cb]) (;B[ha];W[de])) (;B[ha];W[ee] (;B[ca];W[de]) (;B[jd];W[de]))) (;B[ha];W[ad] (;B[aa];W[ee] (;B[ca];W[de]) (;B[jd];W[de])) (;B[ca];W[aa])) (;B[ca];W[aa])) (;B[ga];W[ha] (;B[hb];W[ga] (;B[ia];W[ad] (;B[aa];W[ee]) (;B[ca];W[aa])) (;B[aa] (;W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]) (;W[ad] (;B[ia];W[ee]) (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]))) (;B[ca];W[aa])) (;B[ca];W[aa]) (;B[aa];W[ad] (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]) (;B[hb];W[ga] (;B[ia];W[ee]) (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.])) (;B[ia];W[ee] (;B[ca];W[de]) (;B[hb];W[ga]))) (;B[ia];W[ad] (;B[aa];W[ee] (;B[ca];W[de]) (;B[hb];W[ga])) (;B[ca];W[aa]) (;B[hb];W[ga] (;B[aa]) (;B[ca];W[aa])))) (;B[ha];W[hb] (;B[ib];W[ga] (;B[ia];W[ad] (;B[aa];W[ee]) (;B[ca];W[aa])) (;B[aa];W[ad] (;B[ia];W[ee]) (;B[ca];W[ia] (;B[db];W[cb] (;B[ja];W[ee] (;B[ha]C[Just ko.]) (;B[bb];W[de])) (;B[bb];W[ee]C[Ko]) (;B[ee];W[de]) (;B[de];W[ee])) (;B[ja];W[ee] (;B[db];W[cb]) (;B[ha];W[de])) (;B[ee];W[de]) (;B[de];W[ee]))) (;B[ca];W[aa])) (;B[aa];W[ib]C[White escapes, Black dies.])) (;B[ca];W[aa])) (;W[ja]C[This variation is just for reference. White does not play like this.];B[ha]C[Black can simply shut White in like this. Now White loses the capturing race no matter what.RIGHT]) (;W[ha]C[Just for reference. White does not play like this.];B[jb];W[ce];B[aa];W[ad];B[ca];W[ee];B[db];W[cb];B[hb];W[ga];B[ia]C[Black has many options to kill, but one should be enough to prove that this White variation fails too.RIGHT])) (;B[aa];W[ce] (;B[ac];W[ad] (;B[ca];W[ee] (;B[db];W[cb] (;B[hb];W[ga] (;B[ha]C[Taking the liberty at C19 before taking the outside liberty is the key to this problem.RIGHT]TR[ca]TR[ac]TR[aa]) (;B[bb];W[de])) (;B[bb];W[de]) (;B[ha];W[de]) (;B[ga];W[ha] (;B[ia];W[de]) (;B[hb]C[];W[ia] (;B[ja];W[jb] (;B[ga];W[gb] (;B[gc];W[jc]C[White escapes with ko.]) (;B[ib];W[ka]C[White escapes.]) (;B[ka];W[kb]C[White escapes.])) (;B[ib];W[ka]C[White escapes.]) (;B[jc];W[ga]C[Black dies.])) (;B[ga];W[gb] (;B[gc];W[jb]C[White escapes with ko.]) (;B[jb]C[This will probably be enough to capture White.RIGHT]) (;B[kb]C[Capturing White the long way.RIGHT]) (;B[ib];W[jb]C[White escapes.]) (;B[ja];W[jb]) (;B[ka];W[jb]C[White escapes.])) (;B[jb];W[ga]) (;B[ib];W[jb]C[White escapes.])) (;B[bb];W[de]))) (;B[hb];W[de]) (;B[ga];W[de]) (;B[ha];W[de])) (;B[hb];W[ga] (;B[ca];W[ee] (;B[db];W[cb]) (;B[ha];W[de])) (;B[ha];W[ee] (;B[ca];W[de]) (;B[jd];W[de]))) (;B[ha];W[hb] (;B[ib];W[ga] (;B[ia];W[ee]) (;B[ca];W[ia] (;B[db];W[cb] (;B[ja];W[ee] (;B[ha]C[Just ko.]) (;B[bb];W[de])) (;B[bb];W[ee]C[Ko]) (;B[ee];W[de]) (;B[de];W[ee])) (;B[ja];W[ee] (;B[db];W[cb]) (;B[ha];W[de])) (;B[ee];W[de]) (;B[de];W[ee]))) (;B[ca];W[ib]C[White escapes.])) (;B[ga];W[ha] (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]) (;B[hb];W[ga] (;B[ia];W[ee]) (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.])) (;B[ia];W[ee] (;B[ca];W[de]) (;B[hb];W[ga])))) (;B[hb];W[ga] (;B[ac];W[ad] (;B[ca];W[ee] (;B[db];W[cb]) (;B[ha];W[de])) (;B[ha];W[ee] (;B[ca];W[de]) (;B[jd];W[de]))) (;B[ha];W[ad];B[ac];W[ee]) (;B[ca];W[ac])) (;B[ga];W[ha] (;B[ac];W[ad] (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]) (;B[hb];W[ga] (;B[ia];W[ee]) (;B[ca];W[ia]C[White escapes. All White needs is one extra liberty to kill Black.])) (;B[ia];W[ee] (;B[ca];W[de]) (;B[hb];W[ga]))) (;B[hb];W[ga] (;B[ia];W[ad];B[ac];W[ee]) (;B[ac] (;W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]) (;W[ad]))) (;B[ia];W[ad];B[ac];W[ee] (;B[ca];W[de]) (;B[hb];W[ga]))) (;B[ha];W[hb] (;B[ib];W[ga] (;B[ia];W[ad];B[ac];W[ee]) (;B[ac];W[ad])) (;B[ac];W[ib]C[White escapes, Black dies.]))) (;B[hb];W[ga] (;B[aa];W[ce];B[ac];W[ad];B[ca];W[ee];B[db];W[cb];B[ha]C[RIGHT]) (;B[ac];W[ce] (;B[aa];W[ad] (;B[ca];W[ee];B[db];W[cb];B[ha]C[RIGHT]) (;B[ha];W[ee])) (;B[ha];W[ad] (;B[aa];W[ee]) (;B[ca];W[aa]))) (;B[ha];W[ce] (;B[ac];W[ad] (;B[aa];W[ee]) (;B[ca];W[aa])) (;B[aa];W[ad];B[ac]) (;B[ca];W[aa]) (;B[ad];W[ee])) (;B[ca];W[aa])) (;B[ga];W[ha] (;B[hb];W[ga] (;B[ia];W[ce] (;B[ac];W[ad] (;B[aa]) (;B[ca];W[aa])) (;B[aa];W[ad];B[ac]) (;B[ca];W[aa])) (;B[ca];W[aa]) (;B[ac];W[jb]C[White escapes so Black dies.]) (;B[aa];W[jb]C[White escapes so Black dies.])) (;B[ac];W[ce] (;B[hb];W[ga] (;B[ia];W[ad] (;B[aa]) (;B[ca];W[aa])) (;B[aa] (;W[ia]C[White escapes. All White needs is one extra liberty to kill Black.]) (;W[ad])) (;B[ca];W[aa])) (;B[ca];W[aa]) (;B[aa];W[ad]) (;B[ia];W[ad] (;B[aa]) (;B[ca];W[aa]) (;B[hb];W[ga]))) (;B[aa];W[ce] (;B[ac];W[ad]) (;B[hb];W[ga] (;B[ia];W[ad];B[ac]) (;B[ac])) (;B[ia];W[ad];B[ac])) (;B[ca];W[aa])) (;B[ha];W[hb] (;B[ib];W[ga] (;B[ac];W[ce] (;B[ia];W[ad] (;B[aa]) (;B[ca];W[aa])) (;B[aa];W[ad]) (;B[ca];W[aa])) (;B[aa];W[ce] (;B[ia];W[ad];B[ac]) (;B[ac])) (;B[ia];W[ce] (;B[ac];W[ad] (;B[aa]) (;B[ca];W[aa])) (;B[aa];W[ad];B[ac]) (;B[ca];W[aa]))) (;B[ac];W[ce] (;B[ib];W[ga] (;B[ia];W[ad] (;B[aa]) (;B[ca];W[aa])) (;B[aa];W[ad]) (;B[ca];W[aa])) (;B[aa];W[ib]C[White escapes, Black dies.])) (;B[aa];W[ce] (;B[ib];W[ga] (;B[ia];W[ad];B[ac]) (;B[ac])) (;B[ac];W[ib]C[White escapes, Black dies.])) (;B[ca];W[aa])) (;B[ca];W[aa]) (;B[ad];W[ee];B[ac];W[de];B[aa];W[ce];B[hb];W[ga];B[ha];W[ae]))