Problem 2603 goproblems.com


Author	Spica	Created	2003-06-19
Difficulty	7 dan (history)	Source	Spica
AVG solve time	64 sec	Stars	4 (3 votes)
User attempts	107 / 2254	Collections	N/A
Genre	life and death ⓒ	Your attempts	N/A
Similar problems
Created	2003-06-19
Source	Spica
Stars	4 (3 votes)
Collections	N/A
Your attempts	N/A

(;SZ[19]AB[cr]AB[bq]AB[bp]AB[cl]AB[dm]AB[dn]AB[do]AB[ep]AB[eq]AB[es]AB[er]AB[bj]AB[cj]AB[cs]AB[dl]AB[ej]AW[bo]AW[co]AW[cp]AW[dp]AW[dq]AW[dr]AW[ds]AW[cm]AW[cn]AW[ap]AW[bl]C[Can black live in the corner?]FF[4]GM[1]AP[SGFC:1.14]GN[templd31] (;B[ar];W[bs] (;B[ao];W[an] (;B[bm];W[ao] (;B[am];W[al] (;B[bk];W[bn] (;B[bm];W[cq];B[br];W[am];B[ak]C[gote seki. RIGHT]) (;B[am];W[cq];B[br];W[bm];B[ak]C[gote seki. RIGHT]) (;B[ak];W[cq];B[br];W[aq]) (;B[br];W[cq] (;B[bm];W[am];B[ak]C[gote seki. RIGHT]) (;B[am];W[bm];B[ak]C[gote seki. RIGHT]))) (;B[ak];W[bn] (;B[am];W[cq];B[br];W[bm];B[bk]C[gote seki. RIGHT]) (;B[bm];W[cq];B[br];W[am];B[bk]C[gote seki. RIGHT]) (;B[bk];W[cq];B[br];W[aq]) (;B[br];W[cq] (;B[bm];W[am];B[bk]C[gote seki. RIGHT]) (;B[am];W[bm];B[bk]C[gote seki. RIGHT]))) (;B[br];W[cq] (;B[bk];W[bn] (;B[bm];W[am];B[ak]C[gote seki. RIGHT]) (;B[am];W[bm];B[ak]C[gote seki. RIGHT])) (;B[ak];W[bn] (;B[bm];W[am];B[bk]C[gote seki. RIGHT]) (;B[am];W[bm];B[bk]C[gote seki. RIGHT])))) (;B[bn];W[cq];B[br];W[am]C[black dies]) (;B[al];W[cq];B[br];W[aq]) (;B[bk];W[cq];B[br];W[aq]) (;B[br];W[cq];B[am];W[al] (;B[bk];W[bn] (;B[bm];W[am];B[ak]C[gote seki. RIGHT]) (;B[am];W[bm];B[ak]C[gote seki. RIGHT])) (;B[ak];W[bn] (;B[bm];W[am];B[bk]C[gote seki. RIGHT]) (;B[am];W[bm];B[bk]C[gote seki. RIGHT])))) (;B[aq];W[cq]) (;B[bk];W[cq];B[br];W[ao]) (;B[am];W[bm]) (;B[al];W[cq];B[br];W[ao]) (;B[cq];W[ao]) (;B[br];W[bm];B[al];W[ao]C[white wins]) (;B[ak];W[bm];B[al];W[cq];B[br];W[ao])) (;B[an];W[ao] (;B[bm];W[al] (;B[cq];W[am]) (;B[aq];W[am]) (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[bn];W[am]C[white wins]) (;B[am];W[bn]C[white wins])) (;B[bn];W[cq];B[br];W[bm]) (;B[br];W[bm]C[white wins])) (;B[bm];W[ao] (;B[an];W[al] (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[bn];W[am]C[white wins]) (;B[am];W[bn]C[white wins]) (;B[cq];W[am]) (;B[aq];W[am])) (;B[bn];W[am] (;B[bk];W[an] (;B[bm];W[bn];B[ak];W[cq]) (;B[bn];W[cq]) (;B[ak];W[cq])) (;B[ak];W[an]C[white wins])) (;B[al];W[cq];B[br];W[aq]) (;B[bk];W[cq];B[br];W[aq])) (;B[bn];W[ao] (;B[bm];W[am] (;B[bk];W[an] (;B[bm];W[bn];B[ak];W[cq]) (;B[bn];W[cq]) (;B[ak];W[cq])) (;B[ak];W[an]C[white wins])) (;B[an];W[cq];B[br];W[bm])) (;B[bk];W[ao]) (;B[cq];W[ao]) (;B[aq];W[ao]) (;B[br];W[ao];B[bm];W[am] (;B[bn];W[an]C[white wins]) (;B[ak];W[bn]C[white wins]))) (;B[cq];W[ar] (;B[aq];W[ao]C[white wins]) (;B[bm];W[aq]) (;B[ao];W[aq])) (;B[bs];W[ar] (;B[ao];W[aq]) (;B[aq];W[ao]C[white wins]) (;B[an];W[ao] (;B[aq];W[cq]) (;B[bm];W[al] (;B[aq];W[am]) (;B[cq];W[aq]) (;B[bk];W[bn]) (;B[ak];W[bn])) (;B[al];W[aq]))) (;B[aq];W[ao] (;B[cq];W[ar]) (;B[br];W[as] (;B[bm];W[am] (;B[bn];W[an]C[white wins]) (;B[ak];W[bn];B[al];W[cq]C[white wins])) (;B[an];W[bm]C[white wins]) (;B[bn];W[bm]C[white wins])) (;B[bm];W[am] (;B[br];W[as] (;B[bn];W[an]C[white wins]) (;B[ak];W[bn];B[al];W[ar]C[white wins])) (;B[as];W[br]) (;B[bn];W[an]C[white wins]) (;B[ak];W[bn]C[white wins])) (;B[as];W[br])) (;B[br];W[ao] (;B[aq];W[as] (;B[bm];W[am] (;B[bn];W[an]C[white wins]) (;B[ak];W[bn];B[al];W[ar]C[white wins])) (;B[an];W[bm]C[white wins]) (;B[bn];W[bm]C[white wins])) (;B[bm];W[am] (;B[aq];W[as] (;B[bn];W[an]C[white wins]) (;B[ak];W[bn];B[al];W[ar]C[white wins])) (;B[bn];W[aq]C[white wins]) (;B[ak];W[bn] (;B[al];W[aq]C[white wins]) (;B[aq];W[as]C[white wins];B[al];W[ar]C[white wins])))) (;B[ao];W[ar] (;B[br];W[an] (;B[aq];W[as] (;B[bm];W[am] (;B[ak];W[cq];B[ao];W[bn]C[white can play ko if she has enough threats (or she could have chosen sente seki instead by connecting the ko earlier).]) (;B[bk];W[cq];B[ao];W[bn]C[white can play ko if she has enough threats (or she could have chosen sente seki instead by connecting the ko earlier).]) (;B[ao];W[ak];B[bk];W[bn];B[aj];W[cq]C[black cannot win the double ko])) (;B[ao];W[bm];B[al];W[ak];B[bk];W[am]C[double ko, white wins]) (;B[bk];W[ao]) (;B[am];W[bm]) (;B[al];W[ao]) (;B[ak];W[ao])) (;B[as];W[bs]C[ko white takes first (white connects at A3 to finish the ko)])) (;B[aq];W[br] (;B[cq];W[an]C[ko white takes first (black would play B7 next)]) (;B[bs];W[cq];B[as];W[ar];B[br];W[an]C[ko white takes first (black would play B7 next)]) (;B[as];W[cq];B[bs];W[ar];B[br];W[an]C[ko white takes first (black would play B7 next)]) (;B[bm];W[am] (;B[cq];W[bn] (;B[bk];W[ak];B[aj];W[an]C[double ko, white wins]) (;B[ak];W[an]C[ko white takes first (black would play B7 next), A8 instead would have given white a seki]) (;B[bs];W[ak];B[bk];W[an]C[double ko, white wins]) (;B[as];W[ak];B[bk];W[an]C[double ko white wins])) (;B[bk];W[bn] (;B[cq];W[ak];B[aj];W[an]C[double ko, white wins]) (;B[bs];W[cq];B[as];W[ar];B[br];W[ak];B[aj];W[an]C[double ko, white wins]) (;B[as];W[cq];B[bs];W[ar];B[br];W[ak];B[aj];W[an]C[double ko, white wins])) (;B[ak];W[bn] (;B[cq];W[an]C[ko white takes first, A8 instead would have given white a seki]) (;B[bs];W[cq];B[as];W[ar];B[br];W[an]C[ko white takes first, A8 instead would have given white a seki]) (;B[as];W[cq];B[bs];W[br];B[ar];W[an]C[ko white takes first, A8 instead would have given white a seki])) (;B[bs];W[ak] (;B[bk];W[bn]C[double ko, white wins]) (;B[an];W[bn] (;B[cq];W[ap];B[ao];W[bk]) (;B[bk];W[ap];B[ao];W[an]C[double ko, white wins])) (;B[cq];W[bn];B[bk];W[an]C[double ko, white wins])) (;B[as];W[ak]C[white wins through double ko, see variations at B1]) (;B[an];W[bn] (;B[cq];W[ap];B[ao];W[ak];B[bk];W[an]C[double ko, white wins]) (;B[ak];W[ap];B[ao];W[cq]) (;B[bk];W[ap];B[ao];W[cq]))) (;B[an];W[cq]) (;B[bn];W[bm] (;B[an];W[cq]) (;B[cq];W[an];B[al];W[ak];B[bk];W[am]C[white wins through double ko])) (;B[am];W[cq])) (;B[as];W[an] (;B[br];W[bs]C[ko white takes first (white connects at A3 to finish the ko)]) (;B[aq];W[bs];B[ao];W[cq])) (;B[an];W[br] (;B[bm];W[bs]) (;B[bn];W[bs]) (;B[aq];W[cq]) (;B[cq];W[aq]) (;B[bs];W[cq])) (;B[bm];W[aq] (;B[an];W[br]) (;B[br];W[an]) (;B[cq];W[an]) (;B[bn];W[an])) (;B[bn];W[aq] (;B[bm];W[an]) (;B[an];W[bm]) (;B[br];W[an]) (;B[cq];W[bm])) (;B[cq];W[aq]) (;B[bs];W[aq])) (;B[bm];W[ao] (;B[al];W[ar] (;B[aq];W[br]) (;B[br];W[cq])) (;B[bk];W[ar] (;B[aq];W[br]) (;B[br];W[cq]) (;)) (;B[an];W[al] (;B[aq];W[am]) (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[cq];W[am]) (;B[ar];W[bs] (;B[cq];W[am]) (;B[aq];W[am]) (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[bn];W[am]C[white wins]) (;B[am];W[bn]C[white wins])) (;B[bn];W[ar]) (;B[am];W[ar]) (;B[br];W[am]) (;B[as];W[am])) (;B[ar];W[bs] (;B[al];W[cq];B[br];W[aq]) (;B[bk];W[cq];B[br];W[aq]) (;B[an];W[al] (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[aq];W[am]) (;B[cq];W[am]) (;B[bn];W[am]C[white wins]) (;B[am];W[bn]C[white wins])) (;B[bn];W[am]C[white wins] (;B[bk];W[an] (;B[bm];W[bn];B[ak];W[cq]) (;B[bn];W[cq]) (;B[ak];W[cq])) (;B[ak];W[an]C[white wins]))) (;B[aq];W[am] (;B[bn];W[an]C[white wins]) (;B[br];W[as]C[white wins] (;B[bn];W[an]C[white wins]) (;B[ak];W[bn];B[al];W[cq]C[white wins])) (;B[as];W[br]C[white wins]) (;B[ak];W[bn]C[white wins])) (;B[bn];W[am]C[white wins here]) (;B[br];W[am] (;B[aq];W[as] (;B[bn];W[an]C[white wins]) (;B[ak];W[bn]C[white wins];B[al];W[ar]C[white wins])) (;B[bn];W[an]C[white wins]) (;B[ak];W[bn]C[white wins] (;B[al];W[aq]C[white wins]) (;B[aq];W[as]C[white wins])))) (;B[an];W[ao] (;B[aq];W[bm]C[white wins]) (;B[bm];W[al] (;B[aq];W[am]) (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[cq];W[am]) (;B[bn];W[am];B[bn];W[ar]) (;B[am];W[bn];B[am];W[ar]) (;B[ar];W[bs] (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[aq];W[am]) (;B[cq];W[am]) (;B[bn];W[am]C[white wins]) (;B[am];W[bn]C[white wins])) (;B[as];W[am]) (;B[br];W[am])) (;B[ar];W[bs] (;B[bm];W[al] (;B[bk];W[bn]) (;B[ak];W[bn]) (;B[aq];W[am]) (;B[cq];W[am]) (;B[bn];W[am]C[white wins]) (;B[am];W[bn]C[white wins])) (;B[bn];W[bm]C[white wins])) (;B[bn];W[bm]C[white wins]) (;B[br];W[bm]C[white wins here])) (;B[bk];W[bm] (;B[an];W[ao] (;B[al];W[ar] (;B[br];W[cq]) (;B[aq];W[br]) (;B[am];W[br])) (;B[ar];W[bs]C[white wins]) (;B[br];W[aq]C[white wins]) (;B[aq];W[cq]C[white wins])) (;B[aq];W[ao]C[white wins here]) (;B[ar];W[bs] (;B[ao];W[an];B[al];W[ao]C[white wins]) (;B[an];W[ao]C[white wins]) (;B[br];W[ao]) (;B[al];W[ao]C[white wins])) (;B[br];W[ao]C[white is ahead]) (;B[ao];W[an] (;B[al];W[ar] (;B[aq];W[br]) (;B[br];W[aq])) (;B[ar];W[bs];B[al];W[ao]C[white wins]) (;B[bs];W[ar];B[al];W[aq])) (;B[al];W[ao] (;B[ar];W[bs]C[white wins]) (;B[bs];W[ar]) (;B[aq];W[cq]C[white is ahead]) (;B[br];W[aq]C[white is ahead]))))