Problem 21315 goproblems.com


Author	alkexr	Created	2016-08-29
Difficulty	7 dan (history)	Source	N/A
AVG solve time	83 sec	Stars	5 (1 votes)
User attempts	22 / 174	Collections	Corner based
Genre	best move	Your attempts	N/A
Similar problems
Created	2016-08-29
Source	N/A
Stars	5 (1 votes)
Collections	Corner based
Your attempts	N/A

(;AW[ch]AW[ci]AW[bl]AW[cm]AW[dm]AW[dn]AW[fn]AW[do]AW[ep]AW[eq]AW[gq]AW[jq]AW[fr]AW[fs]AB[bk]AB[cl]AB[dl]AB[el]AB[bm]AB[cn]AB[co]AB[dp]AB[dq]AB[cr]AB[er]AB[es]LB[bk:4]LB[bl:3]LB[bm:2]LB[cm:1]C[Black decided to take the cutting stone. Gain something in the corner.] (;W[bn];B[al] (;W[cp];B[bo] (;W[bp] (;B[an]C[CHOICE] (;W[cq];B[dr] (;W[br] (;B[bq]C[CHOICE] (;W[aq] (;B[ap]C[CHOICE] (;W[ao]C[Good ko. (White took first and has a local threat at B3.)RIGHT]) (;W[cs];B[bq]) (;W[ds];B[bq]) (;W[bs];B[bq]) (;W[as];B[bq]) (;W[ar];B[bq])) (;B[bs];W[cs];B[ds];W[cs]C[RIGHT])) (;W[ap] (;B[bs]C[CHOICE] (;W[ar];B[ao];W[aq];B[cs]C[Seki.RIGHT]) (;W[aq];B[cs] (;W[ar];B[ao]C[Seki.RIGHT]) (;W[as];B[ar]C[Good ko.RIGHT])) (;W[cs];B[ar]) (;W[ds];B[ar]) (;W[as];B[ar])) (;B[ar] (;W[bs];B[ao];W[aq];B[bq]) (;W[aq];B[bs];W[as]C[Good ko.RIGHT]))) (;W[cs];B[ap]) (;W[ds];B[ap]) (;W[bs];B[ap]) (;W[ar];B[ap]) (;W[ao];B[ap])) (;B[ap];W[bq] (;B[cs];W[bs]C[RIGHT]) (;B[aq];W[cs]C[RIGHT]) (;B[bs];W[cs];B[ds];W[cs]C[RIGHT])) (;B[cs];W[bs]C[RIGHT]) (;B[bs];W[cs];B[ds];W[cs]C[RIGHT])) (;W[ao];B[ap];W[bq];B[br]) (;W[ap];B[br]C[Black wins the race.]) (;W[bq];B[br]) (;W[ar];B[ap];W[bq];B[br]) (;W[aq];B[br];W[ao];B[bn])) (;W[dr] (;B[ds];W[cq];B[dr];W[br]C[RIGHT]) (;B[cq]C[CHOICE] (;W[ds];B[bq]C[You could have gained more.]) (;W[cs];B[bs];W[ds];B[br]C[You could have gained more.]) (;W[br] (;B[bq]C[CHOICE];W[cs];B[ap] (;W[ds]C[RIGHT]) (;W[bs]C[RIGHT])) (;B[ds] (;W[bq] (;B[ap];W[bs]C[RIGHT]) (;B[cs];W[bs]C[RIGHT]) (;B[bs]C[CHOICE] (;W[as];B[ar]) (;W[ar];B[ap]C[White can't approach.]) (;W[aq];B[as]C[White can't approach.];W[ao];B[bn]) (;W[ap];B[ar]C[White can't approach.]))) (;W[ap];B[bq] (;W[aq];B[ao] (;W[ar];B[bs]) (;W[cs];B[bs])) (;W[cs];B[bs] (;W[ar];B[aq]) (;W[aq];B[ar]))) (;W[bs];B[bq];W[cs];B[aq];W[dr]C[RIGHT])))))) (;B[ao];W[cq];B[dr];W[br] (;B[bq];W[aq] (;B[cs];W[bs]C[RIGHT]) (;B[bs];W[cs]C[RIGHT])) (;B[ap];W[bq];B[bs];W[cs]C[RIGHT]) (;B[bs];W[cs]C[RIGHT]))) (;W[cq];B[dr] (;W[br];B[bq]) (;W[bp];B[an] (;W[br];B[bq];W[aq];B[ap];W[ao]C[Good ko. (White took first and has a local threat at B3.)RIGHT]) (;B[dr] (;W[br] (;B[bq]C[CHOICE] (;W[aq] (;B[ap]C[CHOICE] (;W[ao]C[Good ko. (White took first and has a local threat at B3.)RIGHT]) (;W[cs];B[bq]) (;W[ds];B[bq]) (;W[bs];B[bq]) (;W[as];B[bq]) (;W[ar];B[bq])) (;B[bs];W[cs];B[ds];W[cs]C[RIGHT])) (;W[ap] (;B[bs]C[CHOICE] (;W[ar];B[ao];W[aq];B[cs]C[Seki.RIGHT]) (;W[aq];B[cs] (;W[ar];B[ao]C[Seki.RIGHT]) (;W[as];B[ar]C[Good ko.RIGHT])) (;W[cs];B[ar]) (;W[ds];B[ar]) (;W[as];B[ar])) (;B[ar] (;W[bs];B[ao];W[aq];B[bq]) (;W[aq];B[bs];W[as]C[Good ko.RIGHT]))) (;W[cs];B[ap]) (;W[ds];B[ap]) (;W[bs];B[ap]) (;W[ar];B[ap]) (;W[ao];B[ap])) (;B[ap];W[bq] (;B[cs];W[bs]C[RIGHT]) (;B[aq];W[cs]C[RIGHT]) (;B[bs];W[cs];B[ds];W[cs]C[RIGHT])) (;B[cs];W[bs]C[RIGHT]) (;B[bs];W[cs];B[ds];W[cs]C[RIGHT])) (;W[ao];B[ap];W[bq];B[br]) (;W[ap];B[br]C[Black wins the race.]) (;W[bq];B[br]) (;W[ar];B[ap];W[bq];B[br]) (;W[aq];B[br];W[ao];B[bn])))) (;W[dr];B[cq] (;W[bp];B[an] (;W[br] (;B[bq]C[CHOICE];W[cs];B[ap] (;W[ds]C[RIGHT]) (;W[bs]C[RIGHT])) (;B[ds] (;W[bq] (;B[ap];W[bs]C[RIGHT]) (;B[cs];W[bs]C[RIGHT]) (;B[bs]C[CHOICE] (;W[as];B[ar]) (;W[ar];B[ap]C[White can't approach.]) (;W[aq];B[as]C[White can't approach.];W[ao];B[bn]) (;W[ap];B[ar]C[White can't approach.]))) (;W[ap];B[bq] (;W[aq];B[ao] (;W[ar];B[bs]) (;W[cs];B[bs])) (;W[cs];B[bs] (;W[ar];B[aq]) (;W[aq];B[ar]))) (;W[bs];B[bq];W[cs];B[aq];W[dr]C[RIGHT]))) (;W[ds];B[bq]C[You could have gained more.]) (;W[cs];B[bs];W[ds];B[br]C[You could have gained more.])) (;W[ds];B[bp]C[You could have gained more.]) (;W[cs];B[bs];W[ds];B[br]C[You could have gained more.]) (;W[br];B[ds];W[bp];B[an];W[bq];B[bs] (;W[ap];B[ar]) (;W[ao];B[ap]) (;W[aq];B[as];W[ao];B[bn]) (;W[ar];B[ap]) (;W[as];B[ar])))) (;W[bo];B[cp];W[bp];B[bq]) (;W[bp];B[cp] (;W[bq];B[bo]) (;W[bo];B[bq])) (;W[dr];B[cp];W[cs];B[bs];W[ds];B[br]C[You could have gained more.])) (;W[cp];B[bo] (;W[cq];B[dr];W[br];B[bq]) (;W[bp];B[ao] (;W[cq];B[dr];W[br];B[bq];W[aq];B[ap];W[bq];B[bs]) (;W[an];B[ap]))) (;W[dr] (;B[cp];W[cs];B[bs];W[ds];B[br]C[You could have gained more.]) (;B[ds] (;W[cp];B[bn];W[cq];B[dr];W[br]C[RIGHT]) (;W[bn];B[al];W[cp];B[bo];W[bp];B[an];W[cq]C[RIGHT]))))