Problem	10315
Created	2007-09-06
Source	Korean academy problems
Rating

Difficulty	7 dan
Average Solve Time	49 secs
User Attempts	433 / 1280
Solve Ratio Rating	5 kyu
	rating history

Comments are welcome

(;AB[sa]AB[ra]AW[sc]AW[rc]AW[sd]AW[qd]AW[pc]AW[oc]AW[nc]AW[nb]AW[oa]AB[na]AB[ma]AB[mb]AB[mc]AB[md]AB[od]AB[nd]AB[pd]AB[qe]AB[re]AB[rd]AB[se]C[Black to kill]AP[goproblems] (;B[qc];W[qb] (;B[rb];W[qd]C[Only ko]) (;B[pb];W[qd]C[Only ko])) (;B[qb];W[qc];B[pb] (;W[pa];B[ob]C[RIGHT]) (;W[ob];B[pa]LB[rb:A]AB[se]C[Right! White can't atari at ARIGHT])) (;B[pa];W[pb];B[ob]C[Only ko]) (;B[pb];W[qb] (;B[pa];W[qa];B[ob];W[oa]) (;B[qa];W[qc];B[pa];W[ob]C[Only seki])))