Problem 16403 goproblems.com


Author	BartTM	Created	2012-08-23
Difficulty	5 dan (history)	Source	Variation on 3893
AVG solve time	78 sec	Stars	3.67 (3 votes)
User attempts	192 / 674	Collections	N/A
Genre	endgame	Your attempts	N/A
Similar problems
Created	2012-08-23
Source	Variation on 3893
Stars	3.67 (3 votes)
Collections	N/A
Your attempts	N/A

(;AW[ab]AW[bc]AW[cd]AW[de]AW[df]AW[bg]AB[cg]AB[dg]AW[dd]AW[cc]AB[bb]AB[cb]AB[dc]AB[eb]AB[ed]AB[ee]AB[ef]AB[eg]AW[ch]AB[be]AW[dh]AW[eh]AW[bh]C[You need to capture that stone just to keep some territory here.]TR[be]AP[goproblems] (;W[bf];B[ad] (;W[ac];B[cf] (;W[ba];B[ce]) (;W[bd];B[ae]) (;W[ae];B[af] (;W[ag];B[ce]) (;W[ce];B[ba])) (;W[ce];B[ba]) (;W[af];B[ce])) (;W[bd];B[cf] (;W[ac];B[ae]) (;W[ce];B[ac]) (;W[af];B[ce]) (;W[ba];B[ce]) (;W[ae];B[af] (;W[ce];B[ac]) (;W[ac];B[ae]) (;W[ag];B[ae]))) (;W[ce];B[cf]) (;W[cf];B[ac]) (;W[af];B[cf] (;W[bd];B[ce]) (;W[ce];B[ac]) (;W[ae];B[ce]) (;W[ac];B[ce])) (;W[ae];B[cf] (;W[ce];B[af] (;W[ac];B[ba]) (;W[bd];B[ac]) (;W[ag];B[ac])) (;W[bd];B[af] (;W[ce];B[ac]) (;W[ac];B[ae]) (;W[ag];B[ae])) (;W[ac];B[af] (;W[ag];B[ce]) (;W[ce];B[ba])) (;W[af];B[ce]))) (;W[cf] (;B[ad]C[CHOICE] (;W[bf];B[ac]) (;W[ac];B[bf] (;W[af]C[] (;B[ba] (;W[bd]C[RIGHT]) (;W[ce];B[aa]) (;W[ag];B[aa] (;W[ae]C[RIGHT]) (;W[bd];B[ce]))) (;B[bd];W[ag]C[RIGHT])) (;W[bd];B[af]C[Ko]) (;W[ce];B[bd]) (;W[ba];B[ca] (;W[af];B[bd]C[Ko]) (;W[aa];B[bd]) (;W[bd];B[ae]C[Ko]) (;W[ce];B[bd]) (;W[ae];B[bd];W[af];B[ag];W[af];B[aa]C[Ko])) (;W[ae];B[bd] (;W[ba];B[af]) (;W[af];B[ag] (;W[af];B[ba]) (;W[ba];B[af])))) (;W[bd] (;B[bf] (;W[af];B[ba] (;W[ag];B[aa] (;W[ae]C[RIGHT]) (;W[ac];B[ce]) (;W[ce];B[ac])) (;W[ac]C[RIGHT]) (;W[ce];B[ac])) (;W[ce];B[ac]) (;W[ae];B[af] (;W[ac];B[ce]C[Ko]) (;W[ce];B[ac]) (;W[ag];B[ba];W[ac];B[aa]C[Ko]) (;W[ba];B[ce])) (;W[ac];B[af]C[Ko])) (;B[ae];W[ac];B[bf];W[ag];B[ba];W[af]C[RIGHT])) (;W[ce];B[bf] (;W[af];B[ac]) (;W[bd];B[ac]) (;W[ac];B[bd])) (;W[af];B[ac]) (;W[ae];B[bf] (;W[ce];B[bd]) (;W[ac];B[bd] (;W[ba];B[af]) (;W[af];B[ag] (;W[af];B[ba]) (;W[ba];B[af]))) (;W[bd];B[af] (;W[ac];B[ce]C[Ko]) (;W[ce];B[ac]) (;W[ag];B[ba];W[ac];B[aa]C[Ko]) (;W[ba];B[ce])) (;W[af];B[ag] (;W[af];B[ac]) (;W[bd];B[ce]) (;W[ac];B[bd] (;W[af];B[ba]) (;W[ba];B[af]))))) (;B[bf] (;W[ad] (;B[ag]C[] (;W[af];B[ae] (;W[bd];B[ba];W[ah];B[aa];W[af]C[Two stage ko with separate kos]) (;W[ce];B[ba];W[ah];B[aa];W[af]C[Two stage ko with separate kos]) (;W[ah];B[ba] (;W[bd];B[aa];W[af]C[Two stage ko with separate kos]) (;W[ce];B[aa];W[af]C[Two stage ko with separate kos]) (;W[af];B[aa] (;W[bd];B[ag]C[two stage ko]) (;W[ce];B[ag]C[Two stage ko.]) (;W[ag];B[ac]C[Ko])) (;W[ac];B[aa] (;W[af]C[Ko for seki or death]) (;W[ce];B[bd]) (;W[bd];B[ce]))) (;W[ac];B[ba] (;W[ah];B[aa] (;W[af]C[Ko for seki or death]) (;W[ce];B[bd]) (;W[bd];B[ce])) (;W[bd];B[aa]) (;W[ce];B[aa])) (;W[aa];B[bd] (;W[ac];B[ba]) (;W[ah];B[ba])) (;W[ba];B[bd] (;W[ah];B[ac]C[Ko]) (;W[ac];B[ca];W[ah];B[aa]C[Ko]))) (;W[ae] (;B[bd];W[ah]C[RIGHT]) (;B[af];W[ah]C[RIGHT])) (;W[bd];B[ae]) (;W[ce];B[ae] (;W[ah];B[ba] (;W[af]C[Approach move ko]) (;W[ac];B[aa]C[Ko])) (;W[ac];B[ba];W[ah];B[aa]) (;W[ba];B[ca] (;W[ah];B[aa] (;W[af]C[Alive in double ko.RIGHT]) (;W[ac];B[bd]) (;W[db];B[ac];W[ec];B[bd]) (;W[ec];B[ac];W[db];B[bd])) (;W[ac];B[aa]C[Ko]) (;W[db]C[NOTTHIS]) (;W[ec]C[NOTTHIS])) (;W[db]C[NOTTHIS]) (;W[ec]C[NOTTHIS])) (;W[ah];B[ae] (;W[af] (;B[ba] (;W[bd];B[ag]C[Approach move 2 stage ko]) (;W[ce];B[ag]C[Approach move 2 stage ko]) (;W[ag];B[aa])) (;B[fe];W[ff];B[ag] (;W[ba]) (;W[bd]))) (;W[ba];B[bd] (;W[af]C[];B[ac]C[Ko]) (;W[ca];B[db] (;W[af]C[];B[ac]C[Ko]) (;W[ac];B[da];W[af]C[Approach move multi stage ko]) (;W[aa];B[da];W[af];B[ac])) (;W[ac];B[ca];W[af]C[2 stage ko])) (;W[bd];B[ba];W[af]C[Approach move 2 stage ko]) (;W[ce];B[ba] (;W[af]C[Approach move ko]) (;W[ac];B[aa]C[Ko])))) (;B[ae] (;W[ag];B[ba];W[af];B[aa];W[bd]C[RIGHT]) (;W[bd];B[ba];W[ag];B[aa];W[af]C[RIGHT])) (;B[af];W[ag] (;B[ba];W[ae];B[aa];W[bd]C[RIGHT]) (;B[ae];W[bd];B[ba];W[ce]C[RIGHT])) (;B[ce];W[af]C[RIGHT])) (;W[ce];B[bd]) (;W[bd] (;B[ad];W[af]C[RIGHT];B[ba] (;W[ag];B[aa] (;W[ae]C[RIGHT]) (;W[ac]) (;W[ce];B[ac])) (;W[ac]C[RIGHT]) (;W[ce];B[ac])) (;B[af];W[ad];B[ba];W[ag];B[aa];W[ae]C[RIGHT]) (;B[ae];W[ag];B[ba];W[af];B[aa];W[ad]C[RIGHT]) (;B[ba];W[af];B[ae] (;W[ad];B[ag];W[ah];B[aa];W[af]C[Two stage ko with separate kos]) (;W[ag];B[aa];W[ad]C[RIGHT]) (;W[ac];B[ag];W[ah];B[aa]C[Seki or death.])) (;B[ag] (;W[ce];B[ad]) (;W[ae];B[ad] (;W[ac];B[af];W[ad];B[ba];W[ah];B[aa];W[ce]C[RIGHT]) (;W[ah];B[af] (;W[ac];B[ba]C[Ko]) (;W[ba];B[ca];W[ac];B[aa];W[ae];B[ff];W[fe];B[ad];W[ba];B[gf];W[ge];B[aa];W[ae]))))) (;W[af] (;B[ad];W[bd];B[ba] (;W[ag];B[aa] (;W[ae]C[RIGHT]) (;W[ac]) (;W[ce];B[ac])) (;W[ac]C[RIGHT]) (;W[ce];B[ac])) (;B[ae];W[ag];B[ba];W[ad];B[aa];W[bd]C[RIGHT])) (;W[ae]) (;W[ac];B[af] (;W[bd];B[ba] (;W[ae];B[aa] (;W[ag];B[ad]C[Ko]) (;W[ad];B[ce]) (;W[ce];B[ad])) (;W[ce];B[aa]) (;W[ad];B[aa]C[Seki]) (;W[ag];B[aa]C[Seki or ko.])) (;W[ag];B[ba] (;W[ad]C[Seki]) (;W[bd];B[aa]C[Seki or ko.]) (;W[ce];B[ad])) (;W[ad]C[Seki]) (;W[ce];B[ad])))) (;W[ad];B[cf]TR[be]C[Won't catch that stone like this.]) (;W[ce];B[bf] (;W[cf];B[bd]) (;W[ad];B[cf]) (;W[af];B[cf]) (;W[ae];B[cf]) (;W[bd];B[cf]) (;W[ac];B[cf])) (;W[af];B[cf] (;W[ae];B[bd];W[ad]C[No territory in gote.]) (;W[bf];B[ad] (;W[bd]) (;W[ce];B[ac]) (;W[ae];B[ce]) (;W[ac])) (;W[ce];B[bf])) (;W[ae];B[cf] (;W[af];B[bd];W[ad]C[No territory in gote.]) (;W[ce];B[ad] (;W[bf];B[af] (;W[ac]) (;W[bd]) (;W[ag];B[ac])) (;W[bd];B[ac]) (;W[af];B[bf]) (;W[ac];B[bf])) (;W[bf];B[ad] (;W[ce];B[af] (;W[ac]) (;W[bd]) (;W[ag];B[ac])) (;W[bd]) (;W[ac]) (;W[af])) (;W[ad];B[bf];W[af]C[No points in gote.]) (;W[bd];B[af] (;W[bf];B[ad] (;W[ce];B[ac]) (;W[ac];B[ae]) (;W[ag];B[ae])) (;W[ad];B[ce]) (;W[ce];B[ad])) (;W[ac];B[af];W[bf];B[ad] (;W[ag];B[ce]) (;W[ce];B[ba]))) (;W[bd];B[cf] (;W[ae];B[af] (;W[bf];B[ad]) (;W[ad];B[ce]) (;W[ce];B[ad])) (;W[bf];B[ad] (;W[ac]) (;W[ce];B[ac]) (;W[af];B[ce]) (;W[ba];B[ce]) (;W[ae];B[af] (;W[ce];B[ac]) (;W[ac];B[ae]) (;W[ag];B[ae]))) (;W[ce];B[ad]) (;W[ad];B[ae]) (;W[af];B[ae]) (;W[ac];B[bf])) (;W[ac];B[cf] (;W[bf];B[ad] (;W[ba];B[ce]) (;W[bd];B[ae]) (;W[ae];B[af] (;W[ag];B[ce]) (;W[ce];B[ba])) (;W[ce];B[ba]) (;W[af];B[ce])) (;W[ae];B[af];W[bf];B[ad]) (;W[ce];B[bf]) (;W[af];B[ae])))