(;GM[1]FF[4]SZ[19]
GN[Black can win the ko in hypothetical play]
PC[http://senseis.xmp.net/?JapaneseRules/LifeAndDeathQuestions]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?JapaneseRules/LifeAndDeathQuestions

Black can win the ko in hypothetical play]
PL[B]

AB[aa][ba][da][ea][ka][la][ma][na][bb][cb][eb][lb][mb][dc][ec][fc][gc][lc][mc][nc][fd][gd][kd][ld][md][qd][ge][he][je][ke][le][ne][re][ef][gf][hf][if][kf][mf][of][pf][qf][rf][sf][fg][hg][kg][ng][og][rg][dh][fh][lh][mh][nh][ph][qh][fi][gi][mi][ri][aj][cj][dj][ej][gj][hj][jj][rj][ak][bk][ck][dk][hk][ik][jk][kk][qk][rk][cl][dl][fl][il][kl][ll][ql][dm][em][fm][jm][km][rm][en][hn][in][jn][qn][rn][ao][do][eo][io][jo][lo][mo][po][qo][ap][bp][dp][ep][fp][hp][jp][lp][qp][bq][cq][dq][hq][iq][jq][kq][lq][mq][qq][rq][sq][cr][ir][kr][rr][bs][cs][ds][js][ks][ls][ms]
AW[fa][ha][ja][oa][ab][fb][gb][hb][jb][kb][nb][ob][ac][bc][cc][hc][ic][kc][oc][qc][dd][ed][hd][id][jd][nd][od][rd][sd][ce][ee][fe][ie][oe][pe][qe][se][ff][jf][eg][gg][ig][jg][mg][eh][gh][hh][ih][kh][oh][ai][bi][ci][di][ei][hi][ii][ji][li][ni][oi][pi][qi][bj][fj][ij][kj][mj][qj][ek][fk][gk][lk][nk][pk][al][bl][el][gl][hl][ml][nl][pl][rl][bm][cm][gm][hm][im][lm][nm][om][pm][qm][an][bn][dn][fn][gn][kn][ln][mn][pn][bo][co][fo][go][ho][ko][no][oo][gp][kp][mp][np][op][pp][aq][eq][fq][gq][nq][pq][ar][br][dr][er][gr][hr][lr][mr][nr][or][qr][sr][es][fs][hs][is][ns][qs][rs][ss]
CR[ar]

;B[as]C[B1]MN[1]
;B[cp]C[B3]MN[3]
;B[cn]C[B5]MN[5]
;B[am]C[B7]MN[7]

;CR[ar]
)
