Problem 11178 goproblems.com


Author	Lok	Created	2008-04-09
Difficulty	1 kyu (history)	Source	N/A
AVG solve time	60 sec	Stars	4.57 (14 votes)
User attempts	414 / 1374	Collections	Semeai / Capturing Race
Genre	tesuji	Your attempts	N/A
Similar problems
Created	2008-04-09
Source	N/A
Stars	4.57 (14 votes)
Collections	Semeai / Capturing Race
Your attempts	N/A

(;AB[sc]AB[rc]AB[qc]AB[pd]AB[pe]AB[od]AB[nd]AB[nc]AW[mb]AW[nb]AW[oc]AW[pc]AW[lc]AW[qd]AW[rd]AW[sd]AW[re]AW[rf]AB[rg]AB[qg]AB[og]C[Black to do well.]AP[goproblems] (;B[qb];W[pb] (;B[pa];W[ob] (;B[sb];W[ra] (;B[sf]C[Black win the semai. Well done!RIGHT]) (;B[qf]C[Black win the semai. Well done!RIGHT]) (;B[qe]C[Black win the semai. Well done!RIGHT]) (;B[se]C[There are better ways to reduce white liberties.Yet this works ...RIGHT])) (;B[qa];W[oa]C[Black 3 liberties, white 4 liberties. White wins.]) (;B[ra];W[sb]LB[sf:A]C[Play at AFORCE];B[sf];W[oa]LB[qf:A]C[Play at AFORCE];B[qf];W[qa]C[Ko. Black can do better.]) (;B[sf];W[sb] (;B[ra]) (;B[qf];W[rb];B[qa];W[oa])) (;B[qf]C[NOTTHIS]) (;B[qe]C[NOTTHIS])) (;B[sb];W[ra];B[pa];W[ob] (;B[sf]C[Black win the semai. Well done!RIGHT]) (;B[qf]C[Black win the semai. Well done!RIGHT]) (;B[qe]C[Black win the semai. Well done!RIGHT]) (;B[se]C[There are better ways to reduce white liberties.Yet this works ...RIGHT])) (;B[ra];W[sb];B[pa];W[ob];B[sf];W[oa]LB[qf:A]C[Play at AFORCE];B[qf];W[qa]C[Ko. Black can do better.]) (;B[sf];W[sb];B[pa];W[ob] (;B[ra];W[oa]LB[qf:A]C[Play at AFORCE];B[qf];W[qa]C[Ko. Black can do better.]) (;B[qf];W[rb];B[qa];W[oa])) (;B[qf]C[NOTTHIS]) (;B[qe]C[NOTTHIS])) (;B[pb];W[ob] (;B[qb];W[pa] (;B[ra];W[sb]C[Black 3 liberties, white 4 liberties. White wins.]) (;B[sf];W[sb]C[Black 2 liberties, white 3 liberties. White wins.]) (;B[qf]C[NOTTHIS]) (;B[qe]C[NOTTHIS])) (;B[qa];W[oa] (;B[rb];W[pa];B[sa];W[qb]C[Ko for life in the corner. Black can do better.]) (;B[sf];W[sb] (;B[rb];W[pa];B[sa];W[qb]C[Ko for life in the corner. Black can do better.]) (;B[qf];W[rb];B[qb];W[pa]C[Black is caught.]) (;B[qe]C[NOTTHIS])) (;B[qf]C[NOTTHIS]) (;B[qe]C[NOTTHIS]) (;B[sb];W[qb] (;B[sf];W[pa]C[Black is caught]) (;B[rb];W[pa]C[Ko.]) (;B[qf]C[NOTTHIS]) (;B[qe]C[NOTTHIS]) (;B[ra];W[pa]C[Black 3 liberties, white 4 liberties. White wins.]))) (;B[rb];W[pa];B[qa];W[qb]C[Ko]) (;B[ra];W[qb] (;B[pa];W[rb]C[Oups.]) (;B[rb];W[pa]C[Black 3 liberties, white 4 liberties. White wins.])) (;B[pa];W[rb];B[qb];W[ra]C[Black 3 liberties, white 4 liberties. White wins.])) (;B[sf];W[qb];B[pb];W[ob];B[rb];W[pa]C[Black 2 liberties, white 3 liberties. White wins.]) (;B[qe]C[NOTTHIS]) (;B[qf]C[NOTTHIS]) (;B[pa];W[ob] (;B[qb];W[sb] (;B[sf];W[pb] (;B[ra]) (;B[qf];W[rb];B[qa];W[oa])) (;B[rb];W[pb];B[sa]C[RIGHT];W[qa];B[sf]C[RIGHT]) (;B[pb];W[ra];B[rb];W[sa]C[Black 3 liberties, white 4 liberties. White wins.FORCE]LB[sf:A]) (;B[ra];W[pb];B[sf];W[oa]LB[qf:A]C[Play at AFORCE];B[qf];W[qa]C[Ko. Black can do better.])) (;B[pb];W[rb];B[qb];W[ra]C[Black 3 liberties, white 4 liberties. White wins.]) (;B[ra];W[qb]) (;B[rb];W[qa] (;B[qb];W[pb]) (;B[pb];W[ra] (;B[sa];W[sb]) (;B[qb];W[sa])) (;B[ra];W[pb];B[qb];W[oa])) (;B[qa];W[rb];B[qb];W[oa])) (;B[qa];W[pb];B[rb];W[sa]) (;B[ra];W[qb] (;B[pb];W[ob] (;B[pa];W[rb]C[Oups.]) (;B[rb];W[pa]C[Black 3 liberties, white 4 liberties. White wins.])) (;B[rb];W[pb]C[Black 3 liberties, white 4 liberties. White wins.])) (;B[ob];W[pb];B[qb];W[pa];B[qa];W[oa]C[White wins]))