Problem 5726 goproblems.com

Add / View flags +2


Author	maba	Created	2004-12-24
Difficulty	1 kyu (history)	Source	Decco vs maba on IGS (slightly modified)
AVG solve time	61 sec	Stars	4.4 (10 votes)
User attempts	466 / 2818	Collections	Amateur Game, Corner based
Genre	tesuji ⓒ	Your attempts	N/A
Similar problems
Created	2004-12-24
Source	Decco vs maba on IGS (slightly modified)
Stars	4.4 (10 votes)
Collections	Amateur Game, Corner based
Your attempts	N/A

(;AB[rb]AB[rd]AW[rc]AB[qc]AB[oc]AB[pc]AB[nb]AB[mc]AB[lc]AW[nc]AW[nd]AW[od]AW[pd]AW[qd]AW[ob]AB[la]AB[re]AW[qe]AW[rf]AW[qg]C[White to do something good.]AP[goproblems] (;W[sc] (;B[sb] (;W[qb];B[sd] (;W[rc];B[sc] (;W[pb];B[rc]C[The two stone edge squeeze to reduce black's liberties. Both groups have three liberties now and it's white's turn, but white needs an approach move. How to handle this?] (;W[na];B[mb] (;W[ra]TR[na]TR[ra]C[] (;B[oa] (;W[sf];B[ma] (;W[se];B[qa];W[sa]C[RIGHT]) (;W[qa];B[na];W[se];B[pa];W[sa]C[RIGHT])) (;W[qa];B[ma];W[sf];B[na];W[se];B[pa];W[sa]C[RIGHT]) (;W[pa];B[ma];W[sf];B[oa]C[ko])) (;B[pa] (;W[qa]C[RIGHT]) (;W[oa];B[ma];W[qa]C[RIGHT]) (;W[sf];B[qa];W[oa];B[qa] (;W[se]C[RIGHT]) (;W[pa];B[ma] (;W[se];B[qa]) (;W[qa];B[sa]) (;W[sa];B[qa])))) (;B[qa]C[Because of the two marked hanes black needs another three moves to capture white, so white wins the race :)CHOICE]TR[na]TR[ra] (;W[sf];B[pa];W[oa];B[qa] (;W[se]C[RIGHT]) (;W[pa];B[ma] (;W[se];B[qa]) (;W[qa];B[sa]) (;W[sa];B[qa]))) (;W[oa];B[ma]) (;W[pa];B[ma];W[sf];B[oa]C[ko])) (;B[sf];W[sg];B[qa];W[se]C[Black gets an indirect ko.RIGHT])) (;W[qa];B[ra] (;W[sf];B[oa]) (;W[oa];B[ma])) (;W[oa];B[qa]) (;W[pa];B[ra]) (;W[sf];B[ra] (;W[se];B[qa]) (;W[qa];B[oa]) (;W[oa];B[qa]))) (;W[ra];B[oa];W[qa];B[na] (;W[sf];B[pa]) (;W[mb];B[ma];W[sf];B[pa])) (;W[qa];B[ra];W[sf];B[oa]) (;W[pa];B[na]) (;W[oa];B[na];W[ra];B[qa]) (;W[sf];B[oa] (;W[pa];B[qa]) (;W[qa];B[ra]) (;W[ra];B[pa]) (;W[mb];B[na];W[ma];B[lb])) (;W[mb];B[na] (;W[ma];B[lb]) (;W[oa];B[ma] (;W[qa];B[ra]) (;W[ra];B[qa])) (;W[ra];B[oa];W[qa];B[ma];W[sf];B[pa]))) (;W[na]C[];B[pb]C[Black lives. You could have killed after he played T18.])) (;W[na]C[];B[pb]C[Black lives. You could have killed after he played T18.])) (;W[pb];B[qb]) (;W[se];B[sd];W[rc];B[sc];W[qb];B[pb]) (;W[na]C[];B[pb]C[Black lives. You could have killed after he played T18.])) (;B[qb] (;W[se]C[T18 is a bit better.RIGHT]) (;W[sb]C[Best sequence for bothRIGHT]))) (;W[na]C[NOTTHIS]) (;W[qb];B[sc];W[pb];B[rc]C[White cannot win this.]) (;W[mb];B[na]))