Problem	4037
Created	2004-03-07
Source	NHK Igo-no-jikan 2004.03.07
Rating

Difficulty	7 dan
Average Solve Time	83 secs
User Attempts	189 / 1776
Solve Ratio Rating	3 dan
	rating history

The original problem is, the S19 being empty, "Can black tenuki to kill?". The answer is yes.

(;AW[sc]AW[rc]AW[qc]AW[pc]AW[oc]AB[nb]AB[nc]AB[nd]AB[od]AB[pd]AB[qd]AB[rd]AB[mb]AB[rb]AW[ra]C[black to kill.]AP[goproblems] (;B[sb];W[ob] (;B[qb];W[pa] (;B[na];W[oa] (;B[qa]C[RIGHT]) (;B[sd];W[qa])) (;B[sd];W[qa]) (;B[qa];W[pb])) (;B[oa];W[pa] (;B[qb];W[na] (;B[qa];W[pb]) (;B[sd];W[qa]) (;B[pb];W[qa]) (;B[ma];W[qa] (;B[oa]C[direct ko.]) (;B[sd];W[oa]))) (;B[sd];W[qb]) (;B[na];W[qb])) (;B[qa];W[qb] (;B[oa];W[pa]) (;B[pa];W[oa]) (;B[sa];W[ra])) (;B[pa];W[oa] (;B[qb];W[pb]) (;B[qa];W[qb]) (;B[na];W[qb]) (;B[sd];W[qb])) (;B[sd];W[qb]) (;B[pb];W[qb] (;B[pa];W[oa]) (;B[oa];W[pa]))) (;B[ob];W[sb] (;B[pb];W[qb]) (;B[pa];W[qb]) (;B[qb];W[pb]) (;B[qa];W[qb])) (;B[oa];W[sb] (;B[qb];W[pb]) (;B[qa];W[qb]) (;B[pb];W[qb]) (;B[pa];W[qb])) (;B[pb];W[qb] (;B[sb];W[ob] (;B[pa];W[oa]) (;B[oa];W[pa])) (;B[ob];W[sb]) (;B[oa];W[sb]) (;B[pa];W[sb])) (;B[pa];W[sb] (;B[qb];W[pb]) (;B[pb];W[qb]) (;B[qa];W[qb]) (;B[oa];W[qb]) (;B[ob];W[qb])) (;B[qb];W[sb] (;B[pb];W[ob] (;B[oa];W[pa]) (;B[pa];W[oa]) (;B[sd];W[pa])) (;B[ob];W[pb]) (;B[qa];W[pb] (;B[sa];W[pa]) (;B[pa];W[oa]) (;B[oa];W[pa])) (;B[pa];W[pb]) (;B[oa];W[pb])) (;B[qa];W[sb] (;B[qb];W[pb] (;B[sa];W[pa]) (;B[pa];W[oa]) (;B[oa];W[pa])) (;B[pa];W[qb]) (;B[pb];W[ob] (;B[sa];W[oa]) (;B[oa];W[qb])) (;B[oa];W[qb]) (;B[ob];W[qb]) (;B[sa];W[qb] (;B[ra];W[pa] (;B[ra];W[ob]) (;B[ob];W[ra])) (;B[pa];W[ra]) (;B[oa];W[ra]) (;B[pb];W[ob];B[oa];W[ra]))) (;B[sd];W[qb] (;B[sb];W[ob]) (;B[ob];W[sb]) (;B[oa];W[sb]) (;B[pa];W[sb]) (;B[pb];W[ob])) (;B[sa];W[sb]))