Problem 6734 goproblems.com


Author	maba	Created	2005-06-20
Difficulty	6 dan (history)	Source	a game
AVG solve time	48 sec	Stars	2 (3 votes)
User attempts	192 / 1687	Collections	Corner based, Seki
Genre	life and death ⓢ	Your attempts	N/A
Similar problems
Created	2005-06-20
Source	a game
Stars	2 (3 votes)
Collections	Corner based, Seki
Your attempts	N/A

(;AB[cq]AB[bp]AB[cp]AB[br]AB[dr]AB[dp]AB[do]AW[bo]AW[co]AW[cm]AW[dn]AW[en]AW[eo]AW[ep]AW[eq]AW[er]AW[es]AW[aq]C[Black to live unconditionally.]AP[goproblems] (;B[ds] (;W[ar] (;B[ap] (;W[bs] (;B[cr]C[sekiRIGHT]) (;B[cs];W[dq] (;B[as]C[ko]) (;B[cr];W[ao]C[];B[as]C[ko]) (;B[bq];W[cr])) (;B[dq];W[cs]C[sekiRIGHT]) (;B[bq];W[dq];B[cs];W[cr])) (;W[dq];B[bs]C[RIGHT]) (;W[cs];B[bs]C[RIGHT]) (;W[cr];B[dq]C[RIGHT])) (;B[bq];W[ap]) (;B[bs];W[ap]) (;B[cs];W[ap]) (;B[cr];W[ap]) (;B[dq];W[ap]) (;B[as];W[ap])) (;W[ap] (;B[ar];W[dq] (;B[bs];W[ao] (;B[bq]C[RIGHT]) (;B[cr]C[RIGHT]) (;B[cs];W[bq])) (;B[cr];W[bs]) (;B[cs];W[ao];B[bq]C[RIGHT]) (;B[bq];W[cs] (;B[cr];W[bs]) (;B[bs];W[cr]) (;B[ao];W[ap] (;B[bs];W[cr]) (;B[cr];W[bs])))) (;B[bs];W[ar]) (;B[cs];W[ar])) (;W[dq] (;B[ap];W[bs] (;B[cr];W[ar]C[sekiRIGHT]) (;B[ar];W[cr];B[cs];W[cr]) (;B[cs];W[cr])) (;B[ar];W[bs] (;B[cr];W[ap]) (;B[ap];W[cr];B[cs];W[cr]) (;B[cs];W[cr]) (;B[as];W[cs] (;B[cr];W[ap]) (;B[ap];W[cr]))) (;B[bs];W[ap] (;B[ar];W[ao] (;B[bq]C[RIGHT]) (;B[cr]C[RIGHT]) (;B[cs];W[bq])) (;B[bq];W[ar])) (;B[cr];W[ap] (;B[bs];W[ar]) (;B[ar];W[bs])) (;B[cs];W[ar] (;B[bq];W[ap]) (;B[bs];W[ap]) (;B[as];W[ap]) (;B[ap];W[bs] (;B[cr];W[ao]C[ko];B[as]C[ko]) (;B[as]C[ko])))) (;W[bs]C[CHOICE] (;B[ap] (;W[dq] (;B[cr];W[ar]C[sekiRIGHT]) (;B[cs];W[cr]) (;B[ar];W[cr];B[cs];W[cr]) (;B[as];W[ar] (;B[cr]C[seki. Because of the black move at A1 white has a sente seki instead of a gote one.RIGHT]) (;B[cs];W[cr])) (;B[bq];W[cr];B[cs];W[cr])) (;W[ar]C[] (;B[cr]C[sekiRIGHT]) (;B[dq]C[sekiRIGHT];W[cs]C[sekiRIGHT]) (;B[cs];W[dq] (;B[cr];W[ao]C[ko];B[as]C[ko]) (;B[as]C[ko])) (;B[bq];W[dq] (;B[as];W[ar]) (;B[cs];W[cr]))) (;W[cr] (;B[cs];W[ar] (;B[bq]C[RIGHT]) (;B[dq]C[RIGHT])) (;B[dq]C[RIGHT]))) (;B[ar];W[dq] (;B[cr];W[ap]) (;B[cs];W[cr]) (;B[as];W[cs] (;B[cr];W[ap]) (;B[ap];W[cr])) (;B[ap];W[cr];B[cs];W[cr])) (;B[cs];W[ar] (;B[as];W[ap]) (;B[ap];W[dq] (;B[cr];W[ao]C[ko];B[as]C[ko]) (;B[as]C[ko]))) (;B[cr];W[ap]) (;B[dq];W[ap]))) (;B[ap];W[ds] (;B[ar];W[bs] (;B[cr];W[cs]) (;B[cs];W[cr]C[ko])) (;B[bs];W[ar] (;B[dq];W[cs]) (;B[cs];W[dq])) (;B[cr];W[cs] (;B[ar];W[bs]) (;B[bs];W[ar])) (;B[cs];W[ar] (;B[bs];W[dq]) (;B[bq];W[dq] (;B[cr];W[as];B[bs];W[ar]) (;B[as];W[cr]C[ko])) (;B[cr];W[as]) (;B[dq];W[bs] (;B[cr];W[ao];B[as]C[ko]) (;B[as]C[ko]))) (;B[dq];W[cs] (;B[ar];W[bs]) (;B[bs];W[ar])) (;B[as];W[cs])) (;B[ar];W[ds] (;B[ap];W[bs] (;B[cr];W[cs]) (;B[cs];W[cr]C[ko])) (;B[cs];W[bs] (;B[ap];W[cr]C[ko]) (;B[cr];W[ap]) (;B[dq];W[cr]C[ko]) (;B[as];W[dq] (;B[cr];W[ap]) (;B[ap];W[cr]C[ko]))) (;B[bs];W[ap] (;B[cs];W[dq]) (;B[dq];W[cs])) (;B[cr];W[ap]) (;B[dq];W[cs] (;B[ap];W[bs]) (;B[bs];W[ap]))) (;B[cs];W[ar] (;B[ap];W[dq] (;B[as];W[bs]C[two-step ko]) (;B[ds];W[bs] (;B[cr];W[ao];B[as]C[ko]) (;B[as]C[ko])) (;B[bs];W[ds]) (;B[bq];W[ds] (;B[cr];W[as];B[bs];W[ar]) (;B[as];W[cr]C[ko])) (;B[cr];W[as])) (;B[bq];W[ap]) (;B[bs];W[ap]) (;B[ds];W[ap]) (;B[dq];W[ap]) (;B[as];W[ap])) (;B[bs];W[ap] (;B[ar];W[ds] (;B[cs];W[dq]) (;B[dq];W[cs])) (;B[ds];W[ar])) (;B[cr];W[ap]) (;B[dq];W[ap];B[ar];W[cs];B[ds];W[bs]) (;B[bq];W[ap] (;B[ar];W[cs] (;B[ao];W[ap] (;B[bs];W[ds]) (;B[ds];W[bs])) (;B[ds];W[bs];B[ao];W[ap]) (;B[bs];W[ds];B[ao];W[ap])) (;B[cs];W[ar]) (;B[bs];W[ar])))