Problem	16017
Created	2012-04-30
Source	Xuan Xuan Qijing
Rating

Difficulty	7 dan
Average Solve Time	33 secs
User Attempts	20 / 102
Solve Ratio Rating	1 kyu
	rating history

(;AB[se]AB[re]AB[qe]AB[pd]AB[oc]AB[ob]AB[oa]AB[oe]AW[pc]AW[pb]AW[qa]AW[rc]AW[rd]C[Black to kill]AP[goproblems] (;B[qd];W[qc] (;B[rb];W[sb] (;B[ra];W[sd];B[pa]C[Collect. White can't play R18.RIGHT]TR[qb]) (;B[sd];W[ra])) (;B[sd];W[rb]) (;B[sb];W[rb])) (;B[rb];W[sb] (;B[ra];W[qb] (;B[sd];W[qd]) (;B[qd];W[sd]) (;B[pa];W[sa]) (;B[qc];W[qd])) (;B[qc];W[qb] (;B[qd];W[ra]) (;B[sc];W[ra]) (;B[sd];W[ra]) (;B[pa];W[ra]) (;B[ra];W[qd])) (;B[qb];W[ra]) (;B[sc];W[sd] (;B[qb];W[qc]) (;B[qc];W[qb];B[qd];W[ra]) (;B[qd];W[qc] (;B[ra];W[qb]) (;B[pa];W[ra]))) (;B[sd];W[ra]) (;B[qd];W[ra])) (;B[sb];W[rb] (;B[pa];W[qb] (;B[qd];W[sa];B[ra];W[sc]) (;B[sd];W[sc])) (;B[sc];W[sd])) (;B[sd];W[rb]) (;B[sc];W[rb] (;B[sd];W[sb]) (;B[sb];W[sd])) (;B[qc];W[qd] (;B[rb];W[sb] (;B[sc];W[qb] (;B[sd];W[ra]) (;B[sa];W[ra])) (;B[sd];W[qb])) (;B[sc];W[rb];B[sd];W[sb])) (;B[pa];W[rb] (;B[qc];W[qb];B[qd];W[sa]) (;B[sd];W[qd])))