Problem 21288 goproblems.com


Author	aik	Created	2016-08-08
Difficulty	1 dan (history)	Source	N/A
AVG solve time	64 sec	Stars	4 (3 votes)
User attempts	155 / 550	Collections	N/A
Genre	life and death ⓒ	Your attempts	N/A
Similar problems
Created	2016-08-08
Source	N/A
Stars	4 (3 votes)
Collections	N/A
Your attempts	N/A

(;FF[4]SZ[9]C[A common shape. White can capture this group without a ko, so attempts to setup a ko are rejected. This is problem 272 from tsumego.tasuki.org/books/xxqj.pdf] AB[eb][fb][bc][cc][dc][bd] AW[ga][gb][ec][fc][gc][cd][dd][be][cf] (;W[ae];B[db] (;W[bb];B[ca]) (;W[ad];B[bb]) (;W[ab];B[ca])) (;W[af];B[db]) (;W[bb];B[db] (;W[ae];B[ca]) (;W[ba];B[ab]) (;W[ca];B[ab]) (;W[ea];B[ca]) (;W[fa];B[ca]) (;W[ac];B[ad]) (;W[ad];B[ab]) (;W[cb];B[ba]) (;W[ab];B[ca])) (;W[ba];B[db] (;W[bb];B[ab]) (;W[fa];B[ab]) (;W[ad];B[ac]) (;W[ab];B[ca])) (;W[ca];B[db] (;W[bb];B[ab]) (;W[ea];B[bb]) (;W[fa];B[bb]) (;W[ad];B[bb]) (;W[ab];B[ae])) (;W[da];B[bb] (;W[ba];B[db]) (;W[ca];B[db]) (;W[ea];B[ca]) (;W[fa];B[ca]) (;W[db];B[cb]) (;W[aa];B[db]) (;W[ac];B[db]) (;W[ad];B[db]) (;W[cb];B[db]) (;W[ab];B[db])) (;W[ea];B[db] (;W[bb];B[ca]) (;W[ca];B[bb]) (;W[da];B[bb]) (;W[fa];B[bb]) (;W[ad];B[bb])) (;W[fa];B[db] (;W[bb];B[ca]) (;W[ba];B[ab]) (;W[ca];B[bb]) (;W[da];B[bb]) (;W[ea];B[bb]) (;W[ac];B[bb]) (;W[ad];B[bb]) (;W[ab];B[ca])) (;W[db];B[ca] (;W[ae];B[cb] (;W[ba];B[da]) (;W[ea];B[da]) (;W[fa];B[da]) (;W[ac];B[da]) (;W[ad];B[ab]) (;W[ab];B[da])) (;W[af];B[cb] (;W[ba];B[da]) (;W[ea];B[da]) (;W[fa];B[da]) (;W[ac];B[da]) (;W[ad];B[da]) (;W[ab];B[da])) (;W[bb];B[cb] (;W[ba];B[da]) (;W[ea];B[da]) (;W[fa];B[da]) (;W[aa];B[da]) (;W[ac];B[da]) (;W[ad];B[da]) (;W[ab];B[da])) (;W[ba];B[bb] (;W[ae];B[aa]) (;W[da];B[aa]) (;W[ea];B[aa]) (;W[fa];B[aa]) (;W[aa];B[ab]) (;W[ac];B[aa]) (;W[ad];B[aa]) (;W[cb];B[da])) (;W[da];B[bb] (;W[ba];B[aa]) (;W[ea];B[aa]) (;W[fa];B[aa]) (;W[aa];B[ad]) (;W[ac];B[ae]) (;W[ad];B[ac]) (;W[cb];B[ea]) (;W[ab];B[ae])) (;W[ea];B[ab] (;W[ae];B[cb] (;W[ba];B[da]) (;W[ad];B[da])) (;W[af];B[cb] (;W[ba];B[da]) (;W[ad];B[da])) (;W[bb];B[cb] (;W[ba];B[da]) (;W[aa];B[ba]) (;W[ac];B[ad]) (;W[ad];B[da])) (;W[ba];B[bb] (;W[ae];B[ad] (;W[da];B[aa]) (;W[fa];B[cb]) (;W[cb];B[da])) (;W[af];B[ad] (;W[da];B[cb]) (;W[fa];B[cb]) (;W[cb];B[da])) (;W[da];B[cb] (;W[fa];B[ad]) (;W[ad];B[fa])) (;W[fa];B[ad] (;W[ae];B[cb]) (;W[af];B[cb]) (;W[da];B[cb]) (;W[fb];B[cb]) (;W[eb];B[cb]) (;W[cb]C[RIGHT])) (;W[ac];B[ad] (;W[da];B[aa]) (;W[fa];B[cb]) (;W[cb];B[da])) (;W[ad]C[RIGHT]) (;W[cb];B[da] (;W[fa];B[db]) (;W[db];B[cb]) (;W[ad];B[fa]) (;W[cb];B[db]))) (;W[da];B[cb]) (;W[fa];B[cb] (;W[ba];B[ad]) (;W[ad];B[ba])) (;W[aa];B[ba] (;W[fa];B[cb]) (;W[ad];B[cb]) (;W[cb];B[ad])) (;W[ac];B[ad] (;W[bb];B[cb]) (;W[ba];B[cb]) (;W[fa];B[bb]) (;W[cb];B[bb])) (;W[ad];B[cb] (;W[ae];B[da] (;W[ba];B[fa]) (;W[fa];B[ba])) (;W[af];B[da] (;W[ba];B[fa]) (;W[fa];B[ba])) (;W[bb];B[da] (;W[ba];B[fa]) (;W[fa];B[ba])) (;W[ba];B[da] (;W[ae];B[fa]) (;W[af];B[fa]) (;W[bb];B[fa]) (;W[fa]C[RIGHT]) (;W[aa];B[fa]) (;W[ac];B[ae] (;W[fa];B[ad]) (;W[ad];B[fa]))) (;W[fa];B[ba]) (;W[aa];B[ba]) (;W[ac];B[da] (;W[ba];B[ae]) (;W[fa];B[ba]))) (;W[cb];B[bb] (;W[ae];B[da] (;W[db];B[cb]) (;W[ad];B[fa])) (;W[af];B[ad] (;W[ba];B[da]) (;W[da];B[ba]) (;W[fa];B[ba])) (;W[ba];B[da] (;W[fa];B[db]) (;W[db];B[cb]) (;W[ad];B[fa]) (;W[cb];B[db])) (;W[da];B[fa] (;W[db];B[da]) (;W[ad];B[db])) (;W[fa];B[ad] (;W[ae];B[ba]) (;W[af];B[ba]) (;W[ba]C[RIGHT]) (;W[da];B[ba]) (;W[fb];B[ba]) (;W[eb];B[ba])) (;W[aa];B[da] (;W[db];B[cb]) (;W[ad];B[fa])) (;W[ac];B[ad] (;W[ba];B[da]) (;W[da];B[fa]) (;W[fa];B[ba])) (;W[ad];B[da] (;W[ae];B[fa];W[db];B[cb]) (;W[af];B[fa];W[db];B[cb]) (;W[ba];B[fa];W[db];B[cb]) (;W[fa];B[db]) (;W[db];B[fa] (;W[ae];B[cb]) (;W[af];B[cb]) (;W[ba];B[cb]) (;W[ea]C[RIGHT]) (;W[aa];B[cb]) (;W[ac];B[cb])) (;W[aa];B[fa];W[db];B[cb]) (;W[ac];B[ae] (;W[db];B[cb]) (;W[ad];B[fa]))))) (;W[fa];B[ab] (;W[ae];B[cb] (;W[ba];B[da]) (;W[ad];B[da])) (;W[af];B[cb] (;W[ba];B[da]) (;W[ad];B[da])) (;W[bb];B[cb] (;W[ba];B[da]) (;W[aa];B[ba]) (;W[ac];B[ea]) (;W[ad];B[da])) (;W[ba];B[bb] (;W[ae];B[ad] (;W[da];B[aa]) (;W[ea];B[cb]) (;W[cb];B[da])) (;W[af];B[ad] (;W[da];B[cb]) (;W[ea];B[cb]) (;W[cb];B[da])) (;W[da];B[cb] (;W[ea];B[ad]) (;W[ad];B[ea])) (;W[ea];B[ad] (;W[ae];B[cb]) (;W[af];B[cb]) (;W[da];B[cb]) (;W[fb];B[cb]) (;W[eb];B[cb]) (;W[cb]C[RIGHT])) (;W[ac];B[ad] (;W[da];B[aa]) (;W[ea];B[cb]) (;W[cb];B[da])) (;W[ad]C[RIGHT]) (;W[cb];B[da] (;W[ea];B[db]) (;W[db];B[cb]) (;W[ad];B[aa]))) (;W[da];B[cb]) (;W[ea];B[cb] (;W[ba];B[ad]) (;W[ad];B[ba])) (;W[aa];B[ba] (;W[ea];B[cb]) (;W[ad];B[cb]) (;W[cb];B[ad])) (;W[ac];B[cb] (;W[bb];B[ea]) (;W[ba];B[da]) (;W[aa];B[da]) (;W[ad];B[da])) (;W[ad];B[cb] (;W[ae];B[da] (;W[ba];B[ea]) (;W[ea];B[ba])) (;W[af];B[da] (;W[ba];B[ea]) (;W[ea];B[ba])) (;W[bb];B[da] (;W[ba];B[ea]) (;W[ea];B[ba])) (;W[ba];B[da] (;W[ae];B[ea]) (;W[af];B[ea]) (;W[bb];B[ea];W[ac];B[ae]) (;W[ea]C[RIGHT]) (;W[aa];B[ea]) (;W[ac];B[ae] (;W[ea];B[ad]) (;W[ad];B[ea]))) (;W[ea];B[ba]) (;W[aa];B[da] (;W[ba];B[ea]) (;W[ea];B[ba])) (;W[ac];B[da] (;W[ba];B[ae]) (;W[ea];B[ba]))) (;W[cb];B[bb] (;W[ae];B[da]) (;W[af];B[ba] (;W[ea];B[ad]) (;W[ad];B[da])) (;W[ba];B[da] (;W[ea];B[db]) (;W[db];B[cb]) (;W[ad];B[aa])) (;W[da];B[ea]) (;W[ea];B[ad] (;W[ae];B[ba]) (;W[af];B[ba]) (;W[ba]C[RIGHT]) (;W[da];B[ba]) (;W[fb];B[ba]) (;W[eb];B[ba])) (;W[ac];B[ad] (;W[ba];B[da]) (;W[da];B[ea]) (;W[ea];B[ba])) (;W[ad];B[da] (;W[ba];B[aa]) (;W[ea];B[db]) (;W[db];B[ea])))) (;W[aa];B[cb] (;W[bb];B[da]) (;W[ba];B[da]) (;W[ea];B[da]) (;W[fa];B[da]) (;W[ac];B[da]) (;W[ad];B[da]) (;W[ab];B[da])) (;W[ac];B[ab] (;W[bb];B[ad]) (;W[ba];B[ea]) (;W[da];B[ea]) (;W[ea];B[ad]) (;W[fa];B[cb]) (;W[aa];B[ad]) (;W[ad];B[ae]) (;W[cb];B[ba])) (;W[ad];B[ea] (;W[ae];B[ac] (;W[bb];B[cb]) (;W[ba];B[cb]) (;W[da];B[cb]) (;W[fa];B[da]) (;W[cb];B[bb]) (;W[ab];B[cb])) (;W[af];B[cb] (;W[bb];B[da]) (;W[fa];B[da]) (;W[aa];B[da]) (;W[ac];B[ab]) (;W[ab];B[ac])) (;W[bb];B[cb] (;W[ae];B[ac];W[fa];B[da]) (;W[af];B[da] (;W[ae];B[aa]) (;W[fa];B[ab]) (;W[ac];B[ab]) (;W[ab];B[ac])) (;W[ba];B[da] (;W[fa];B[ab]) (;W[ac];B[ab]) (;W[ab];B[ac])) (;W[fa];B[ab] (;W[ba];B[da]) (;W[da];B[ba]) (;W[aa];B[ba]) (;W[ac];B[ae])) (;W[aa];B[da] (;W[ae];B[ac]) (;W[fa];B[ac]) (;W[ac];B[ba]) (;W[ab];B[ac])) (;W[ac];B[ab] (;W[ae];B[ba]) (;W[af];B[ba]) (;W[ba];B[da];W[fa];B[ae]) (;W[fa];B[ae]) (;W[aa];B[da] (;W[ae]C[RIGHT]) (;W[af];B[ba] (;W[ae];B[ab]) (;W[fa];B[ab]) (;W[ab];B[ae])) (;W[fa]C[RIGHT]) (;W[ab]C[RIGHT]))) (;W[ab];B[ac] (;W[ba];B[aa]) (;W[fa];B[da]))) (;W[ba];B[cb] (;W[bb];B[da]) (;W[fa];B[da]) (;W[ac];B[ab]) (;W[ab];B[ac])) (;W[da];B[cb] (;W[ac];B[ab]) (;W[ab];B[ac])) (;W[fa];B[da] (;W[ae];B[ac]) (;W[bb];B[ab]) (;W[ba];B[cb]) (;W[aa];B[bb]) (;W[ac];B[ab]) (;W[cb];B[bb]) (;W[ab];B[ac])) (;W[aa];B[bb] (;W[ba];B[ab]) (;W[da];B[cb]) (;W[fa];B[da]) (;W[ac];B[ba]) (;W[ab];B[ba])) (;W[ac];B[ab] (;W[ae];B[bb]) (;W[bb];B[ae]) (;W[ba];B[ae]) (;W[da];B[cb]) (;W[fa];B[da]) (;W[aa];B[ae]) (;W[cb];B[bb])) (;W[cb];B[bb] (;W[ae];B[ab]) (;W[ba];B[da]) (;W[fa];B[da]) (;W[ac];B[ab]) (;W[ab];B[ae])) (;W[ab];B[cb] (;W[ae];B[ac];W[fa];B[da]) (;W[af];B[ac];W[fa];B[da]) (;W[bb];B[ac] (;W[ba];B[aa]) (;W[fa];B[da])) (;W[ba];B[ac] (;W[bb];B[aa]) (;W[fa];B[da])) (;W[fa];B[da] (;W[ae];B[ac]) (;W[af];B[ac]) (;W[bb];B[ac];W[ba];B[ae]) (;W[ba];B[ac];W[bb];B[ae]) (;W[aa];B[ac]) (;W[ac]C[RIGHT])) (;W[aa];B[ac];W[fa];B[da]) (;W[ac]C[RIGHT]))) (;W[cb];B[bb] (;W[ba];B[da]) (;W[da];B[ea]) (;W[ea];B[da]) (;W[fa];B[da]) (;W[aa];B[da]) (;W[ac];B[da]) (;W[ad];B[da])) (;W[ab];B[bb] (;W[da];B[ae]) (;W[ea];B[aa]) (;W[fa];B[da]) (;W[aa];B[ea]) (;W[ac];B[ad]) (;W[ad];B[ac]))) (;W[ac];B[db] (;W[bb];B[ad]) (;W[fa];B[bb]) (;W[ad];B[bb]) (;W[ab];B[ca])) (;W[ad];B[db] (;W[ae];B[bb]) (;W[bb];B[ab]) (;W[ba];B[ac]) (;W[ca];B[bb]) (;W[ea];B[bb]) (;W[fa];B[bb]) (;W[ac];B[bb]) (;W[ab];B[ca])) (;W[cb];B[db] (;W[bb];B[ba]) (;W[ab];B[ca])) (;W[ab];B[db] (;W[ae];B[ca]) (;W[bb];B[ca]) (;W[ba];B[ca]) (;W[ca];B[ae]) (;W[fa];B[ca]) (;W[ac];B[ca]) (;W[ad];B[ca]) (;W[cb];B[ca])))