Problem 17375 goproblems.com


Author	aditsu	Created	2013-07-23
Difficulty	7 dan (history)	Source	N/A
AVG solve time	24 sec	Stars	4.5 (2 votes)
User attempts	113 / 448	Collections	Large L-Group
Genre	life and death	Your attempts	N/A
Similar problems
Created	2013-07-23
Source	N/A
Stars	4.5 (2 votes)
Collections	Large L-Group
Your attempts	N/A

(;AB[db]AB[dd]AB[cf]AW[fc]AB[ec]AB[fd]AW[eb]AW[fb]AW[gd]LB[eb:1]LB[ec:2]LB[fb:3]LB[fd:4]LB[gd:5]C[What can black do in the corner?]AB[ge]AW[fe]AB[ed]AB[ff]AW[hd]AW[cc]AB[dc]AW[he]AB[gf]AW[cb]AB[da]AW[be]AB[bf]AW[ce]AB[de]AW[cd]LB[ge:6]LB[cc:7]LB[dc:8]LB[fe:9]LB[ed:10]LB[hd:11]LB[ff:12]LB[he:13]LB[gf:14]LB[cb:15]LB[da:16]LB[be:17]LB[bf:18]LB[ce:19]LB[de:20]LB[cd:21]AP[goproblems] (;B[ad];W[ae];B[ca];W[ba] (;B[bb];W[ab];B[bc]C[Yes, white is dead!RIGHT]) (;B[ab];W[bc] (;B[ac];W[bb]C[Seki, you can do better]) (;B[bb];W[ac]C[White lives])) (;B[bc];W[bd] (;B[bb]C[Yep, not the main line, but it seems to work tooRIGHT]) (;B[ab];W[ac]C[Ko, you can actually do better]) (;B[ac];W[ab]C[White lives]))) (;B[ca];W[ba] (;B[bb];W[ab]C[Ko, you can actually do better]) (;B[ab];W[af]C[If you want to block the escape, please do it at B12] (;B[bh];W[bc] (;B[ad];W[ae] (;B[ac];W[bb]C[Seki, you can do better]) (;B[bb];W[ac]C[White lives])) (;B[bb];W[ac]C[White lives])) (;B[bb];W[bg]C[White escapes]) (;B[ad];W[ae] (;B[bh];W[bc] (;B[bb];W[ac]C[White lives]) (;B[ac];W[bb]C[Seki, you can do better])) (;B[bc];W[bg]C[White escapes]) (;B[bb];W[bg]C[White escapes]))) (;B[ad];W[ab] (;B[ae];W[ac];B[bc];W[bb]C[White lives]) (;B[bc];W[ac] (;B[ae];W[bb]C[White lives]) (;B[bd];W[bb]C[White lives]))) (;B[ae];W[ad];B[bb];W[af]C[If you want to block the escape, please do it at B12] (;B[bh];W[ab]C[Ko, you can actually do better]) (;B[ab];W[bg]C[White escapes]))) (;B[bb];W[ba] (;B[ca];W[ab]C[Ko, you can actually do better]) (;B[ad];W[ab]C[White lives]) (;B[ac];W[bc] (;B[ca];W[ab]C[White lives]) (;B[aa];W[ab]C[White lives]) (;B[ab];W[ad]C[White lives]) (;B[ad];W[ab]C[White lives]) (;B[ae];W[ab]C[White lives])) (;B[ab];W[af]C[If you want to block the escape, please do it at B12] (;B[bh];W[bc] (;B[ad];W[ae] (;B[ac];W[ca]C[Seki, you can do better]) (;B[ca];W[ac]C[White lives])) (;B[ca];W[ac]C[White lives])) (;B[ca];W[bg]C[White escapes]) (;B[ad];W[ae] (;B[bh];W[bc] (;B[ac];W[ca]C[Seki, you can do better]) (;B[ca];W[ac]C[White lives])) (;B[ca];W[bg]C[White escapes]) (;B[bc];W[bg]C[White escapes]))) (;B[bc];W[ab] (;B[ca];W[ac]C[Ko, you can actually do better]) (;B[ac];W[ad]C[Ko, you can actually do better]) (;B[ad];W[bd]C[White lives]))) (;B[ba];W[ca] (;B[ad];W[ae];B[bc];W[bb];B[ab];W[aa]C[Ko, you can actually do better]) (;B[ae];W[ad] (;B[af];W[bc];B[ab];W[ac]C[Seki, you can do better]) (;B[ac];W[af];B[bc];W[bb];B[ab];W[aa]C[Ko, you can actually do better]) (;B[bb];W[bc];B[ab];W[af]C[White lives]))) (;B[ab];W[ca];B[ad];W[ae] (;B[bc];W[bb] (;B[ba];W[aa]C[Ko, you can actually do better]) (;B[af]C[Ko or seki, you can do better])) (;B[ba];W[bb] (;B[ac];W[aa]C[Ko, you can actually do better]) (;B[bc];W[aa]C[Ko, you can actually do better]))) (;B[ac];W[ca] (;B[ae];W[ad];B[bd];W[bc] (;B[ad];W[ab]C[White lives]) (;B[ab];W[ad]C[Ko, you can actually do better]) (;B[ba];W[ad]C[Ko, you can actually do better])) (;B[bb];W[bc] (;B[ae];W[ad]C[Ko, you can actually do better]) (;B[ad];W[ab];B[aa];W[ba]C[White lives]))) (;B[ae];W[ad] (;B[ca];W[ba];B[bb];W[af]C[If you want to block the escape, please do it at B12] (;B[bh];W[ab]C[Ko, you can actually do better]) (;B[ab];W[bg]C[White escapes])) (;B[bc];W[bb];B[ca];W[ba];B[ab];W[af];B[ac]C[Local seki, and white can escape too]) (;B[ac];W[bc] (;B[bd];W[ab]C[White lives]) (;B[ab];W[af]C[White lives]) (;B[ba];W[ab]C[White lives]))) (;B[bc];W[bb];B[ca];W[ba];B[ab];W[ad];B[ac]C[Seki, you can do better]))