Problem	16428
Created	2012-08-31
Source	Life and Death, Jim Davies, 67-1
Rating

Difficulty	1 kyu
Average Solve Time	46 secs
User Attempts	253 / 773
Solve Ratio Rating	5 kyu
	rating history

Thanks to Piccolo, Nimbim and Athanatos for added correct lines.

(;AB[pc]AB[oc]AB[pd]AB[pe]AB[oe]AB[ne]AB[pf]AB[md]AB[og]AB[ng]AB[mg]AW[od]AW[nd]AW[nc]AW[me]AW[ld]AW[qc]AW[qd]AW[qe]AW[qf]AW[qg]AW[oh]AW[nh]AW[mh]AW[lf]AW[lg]AW[mb]C[Best sequence for black...]AP[goproblems] (;B[nb];W[mc] (;B[qb];W[rb] (;B[pa];W[ra] (;B[na]C[Black has 2 eyesRIGHT]) (;B[qa];W[oa]C[Black only has one eye];B[pb];W[na]) (;B[oa];W[ma] (;B[qa];W[ob] (;B[pb];W[na]C[Black has only one eye]) (;B[na];W[pb]C[Black has only one eye])) (;B[na];W[pb] (;B[qa];W[ob]C[Black has only one eye]) (;B[ob];W[qa]C[Black has only one eye])))) (;B[oa];W[ma] (;B[qa]C[Black has 2 eyesRIGHT]) (;B[na];W[pa];B[ob];W[qa]C[Black only has one eye]) (;B[pa];W[ra] (;B[qa];W[ob] (;B[pb];W[na]C[Black has only one eye]) (;B[na];W[pb]C[Black has only one eye])) (;B[na];W[pb] (;B[qa];W[ob]C[Black has only one eye]) (;B[ob];W[qa]C[Black has only one eye]))) (;B[ra]C[RIGHT])) (;B[qa];W[ob]C[Black only has one eye]) (;B[na];W[pb]C[Black only has one eye]) (;B[pb];W[na];B[oa];W[ob];B[qa];W[pa]C[Ko. Black can do better.]) (;B[ob];W[qa];B[pa];W[pb];B[na];W[oa]C[Ko. Black can do better.])) (;B[pb];W[na] (;B[qb];W[rb];B[oa];W[ob]C[Difficult ko for black. Black can do better];B[qa];W[pa]C[Ko. Black can do better.]) (;B[oa];W[ob]C[Ko. Black can do better])) (;B[oa] (;W[pb]C[CHOICE];B[qb];W[rb] (;B[qa]C[Black has 2 eyesRIGHT]) (;B[pa];W[qa]C[Black only has one eye]) (;B[ob];W[qa]C[Black only has one eye])) (;W[ma]C[CHOICE] (;B[na];W[pa]C[Black only has one eye]) (;B[pb];W[na];B[qb];W[rb];B[qa];W[ob]C[Ko. Black can do better]) (;B[pa];W[qb] (;B[pb];W[na]C[Ko. Black can do better]) (;B[na];W[pb]C[Black only has one eye])) (;B[qb];W[rb]C[] (;B[qa]C[Black has 2 eyesRIGHT]) (;B[pa];W[ra]) (;B[ra]C[Better than R19 - well done!RIGHT])))) (;B[pa];W[na] (;B[ob];W[qb]C[Black only has one eye]) (;B[oa];W[qb];B[pb];W[ob]C[Ko. Black can do better])) (;B[ob];W[qb]C[Black has only one eye])) (;B[mc];W[lc]C[Black only has one eye]) (;B[mf];W[ob]C[Black only has one eye]) (;B[nf];W[ob]C[Black only has one eye]) (;B[pg]C[NOTTHIS];W[ph] (;B[mf];W[ob]C[Black only has one eye]) (;B[nf];W[ob]C[Black only has one eye])) (;B[qb];W[ob] (;B[pb];W[rb]C[Black only has one eye]) (;B[rb];W[pb]C[Black only has one eye]) (;B[rc];W[pb] (;B[sb];W[ra];B[rd];W[re]C[There's nothing in the corner]) (;B[ra];W[sb];B[rd];W[re]C[There's nothing in the corner]))) (;B[pb];W[qb]C[Black only has one eye]) (;B[ob];W[qb]C[Black only has one eye]))