This was the second and last game in a two game match on 9x9 in 1968, played to try to decide the proper komi for this board size. The other game Miyamoto Naoki (black) won against Go Seigen with four points also.
May be I've missed some variation, please tell me ..#
Thx to Bass, variations fixed
(;SZ[9]AB[ga]AB[gb]AB[gc]AB[hd]AB[he]AB[hf]AB[hg]AB[hh]AB[gg]AB[fd]AB[ee]AB[dd]AB[dc]AB[cd]AB[be]AB[ad]AB[cf]AB[cg]AB[bg]AB[bh]AW[ch]AW[di]AW[dg]AW[df]AW[eg]AW[eh]AW[fg]AW[gh]AW[hi]AW[ff]AW[gf]AW[ge]AW[gd]AW[fc]AW[fb]AW[fa]AW[db]AW[cc]AW[bc]AW[bd]AW[bb]C[Black to win with 4 points. No komi, white has one prisoner, black none.]AP[goproblems]
(;B[ba];W[cb]
(;B[da];W[eb]C[Please play A]LB[bi:A];B[bi];W[ci]C[This exchange was move 47 and 48. Now finish the game.];B[ac];W[ab];B[ae]C[];W[ca]LB[ih:A]C[Great ! A ko after White J2 would he win. But you could play A7 in sente and with the last point J2 you win the game with 4 points. RIGHT])
(;B[bi];W[ci];B[da];W[eb]))
(;B[bi];W[ci]
(;B[ba];W[cb];B[da];W[eb];B[ac];W[ab];B[ae]C[];W[ca]LB[ih:A]C[Great ! A ko after White J2 would he win. But you could play A7 in sente and with the last point J2 you win the game with 4 points. RIGHT])
(;B[ac];W[ab];B[ae];W[ec]
(;B[ih];W[ed])
(;B[ed];W[ih]C[Black wins the ko, but white has 7+4+the prisoner from D2 = 12 points while black only gets 5+9+the prisoner from J2 = 15 points.];B[ig];W[gi];B[ii];W[de];B[ce];W[ih]
(;B[da];W[ca];B[ii];W[hc];B[hb];W[ih];B[ea];W[eb];B[ii];W[ib];B[ic];W[ih]C[White wins the ko])
(;B[ea];W[eb];B[ii];W[hc];B[hb];W[ih];B[ca];W[da];B[ii];W[ib];B[ic];W[ih];B[cb];W[ba];B[ii];W[ha];B[ia];W[ih])))
(;B[ab];W[ac];B[ba];W[ae];B[da];W[eb];B[cb];W[aa];B[fi];W[gi];B[ab];W[ca])
(;B[ih];W[ec];B[ac];W[ab];B[ae];W[ed])
(;B[ec];W[eb]
(;B[ac];W[ab];B[ae];W[ih];B[ig];W[gi];B[ii];W[de]C[White will win the ko and black wins only with 3 points];B[ce];W[ih]
(;B[ca];W[cb];B[ii];W[fe];B[ed];W[ih];B[da];W[ba];B[ii];W[hc];B[hb];W[ih];B[ei];W[fi];B[ii];W[ib];B[ic];W[ih]C[White wins the ko - only 3 points for black.])
(;B[ei];W[fi];B[ii];W[fe];B[ed];W[ih];B[ca];W[cb];B[ii];W[hc];B[hb];W[ih];B[da];W[ba];B[ii];W[ib];B[ic];W[ih]))
(;B[ab];W[ac];B[ba];W[ae]
(;B[af];W[ca])
(;B[ca];W[da];B[af];W[cb];B[ad];W[aa])
(;B[da];W[cb];B[ca];W[af];B[ag];W[aa]
(;B[ei];W[fi];B[ab];W[de];B[ce];W[aa])
(;B[fi];W[gi];B[ab];W[de];B[ce];W[aa];B[ei];W[fh];B[ab];W[fe];B[ed];W[aa];B[ei];W[fi];B[ab];W[ah]
(;B[aa];W[ea];B[ba])
(;B[bf];W[aa];B[ad];W[ae];B[ab];W[ef]C[Black will be captured..])))))
(;B[eb];W[ec];B[da];W[ea];B[ab];W[ac];B[ba];W[cb])
(;B[da];W[eb]
(;B[ba];W[cb];B[ac];W[ab];B[ae]C[];W[ca]LB[ih:A]C[Great ! A ko after White J2 would he win. But you could play A7 in sente and with the last point J2 you win the game with 4 points. RIGHT])
(;B[ac];W[ab];B[ae];W[ca])))
(;B[ac];W[ab])
(;B[ec];W[eb]
(;B[ac];W[ab];B[ae]
(;W[de];B[ce];W[bi])
(;W[bi];B[ah];W[af]))
(;B[bi];W[ci]
(;B[ac];W[ab];B[ae];W[ih];B[ig];W[gi];B[ii];W[de]C[White will win the ko and black wins only with 3 points];B[ce];W[ih]
(;B[ca];W[cb];B[ii];W[fe];B[ed];W[ih];B[da];W[ba];B[ii];W[hc];B[hb];W[ih];B[ei];W[fi];B[ii];W[ib];B[ic];W[ih]C[White wins the ko - only 3 points for black.])
(;B[ei];W[fi];B[ii];W[fe];B[ed];W[ih];B[ca];W[cb];B[ii];W[hc];B[hb];W[ih];B[da];W[ba];B[ii];W[ib];B[ic];W[ih]))
(;B[ab];W[ac];B[ba];W[ae]
(;B[af];W[ca])
(;B[ca];W[da];B[af];W[cb];B[ad];W[aa])
(;B[da];W[cb];B[ca];W[af];B[ag];W[aa]
(;B[ei];W[fi];B[ab];W[de];B[ce];W[aa])
(;B[fi];W[gi];B[ab];W[de];B[ce];W[aa];B[ei];W[fh];B[ab];W[fe];B[ed];W[aa];B[ei];W[fi];B[ab];W[ah]
(;B[aa];W[ea];B[ba])
(;B[bf];W[aa];B[ad];W[ae];B[ab];W[ef]C[Black will be captured..]))))))
(;B[ih];W[bi])
(;B[ab];W[ac];B[ba];W[ae];B[da];W[eb];B[cb];W[aa];B[bi];W[ci];B[ab];W[ca])
(;B[eb];W[ec];B[da];W[ea];B[ca];W[ba];B[bi];W[ci];B[ac];W[ab];B[ae];W[ih];B[ig];W[gi];B[ii];W[de];B[ce];W[ih];B[ed];W[cb];B[da];W[ca];B[ii];W[hc];B[hb];W[ih];B[ei];W[fi];B[ii];W[ib];B[ic];W[ih]C[White wins the ko, so only 3 points for black.])
(;B[af];W[bi])
(;B[de];W[bi])
(;B[da];W[eb]
(;B[bi];W[ci];B[ba];W[cb];B[ac];W[ab])
(;B[ba];W[cb];B[bi];W[ci]C[This exchange was move 47 and 48. Now finish the game.];B[ac];W[ab];B[ae]C[];W[ca]LB[ih:A]C[Great ! A ko after White J2 would he win. But you could play A7 in sente and with the last point J2 you win the game with 4 points. RIGHT])))