[Event "Irish Championship 1968"]
[Site "Dublin IRL"]
[Date "1968.07.10"]
[Round "5"]
[White "Cassidy, Paul"]
[Black "Wilson, David C."]
[Result "1-0"]
[WhiteClub "Kevin Barry"]
[BlackClub "Fisherwick"]
[WhiteNationality "IRL"]
[BlackNationality "IRL"]
[WhiteFideId "2500191"]
[PlyCount "85"]
[ECO "D94"]
[Opening "Gruenfeld with e3    Bd3"]
[Venue "Dixon Hall, Trinity College Dublin"]
[EventDate "1968.07.06"]
[URL "https://www.irlchess.com/irlch1968_allfiles/games_irlch1968/g44.htm"]
[LastModified "Mon Mar 30 15:46:36 2026"]

{ Event information: <a
href="https://www.irlchess.com/irlch1968_allfiles/pairings_irlch1968.html">Tournament
report</a>. } { Annotator: Paul Cassidy. } { Other information: Note: See
the <a
href="https://lichess.org/analysis/fromPosition/8/p3pk1p/P7/4K1PP/8/8/8/8_w_-_-_0_1">Lichess
Op1 tablebase</a> in conjunction with the note to White's 37th move. }

1. c4 Nf6 2. Nc3 d5 3. d4 g6 4. Nf3 Bg7 5. e3 O-O 6. Bd3 b6 7. cxd5 Nxd5 8.
Nxd5 Qxd5 9. Qc2 c6 10. Be4 Bf5 11. Bxf5 Qxf5 12. Qxf5 gxf5 13. Bd2 Nd7 14.
Bb4 c5 15. dxc5 Bxb2 16. Rb1 bxc5 17. Rxb2 cxb4 18. Rxb4 Rab8 19. Rd4 Rb1+
20. Rd1 Rfb8 21. O-O Rxd1 22. Rxd1 Rb2 23. g3 Nf6 24. Rd2 Rxd2 25. Nxd2 Ne4
26. Nb1 Kg7 27. f3 Nd6 28. Kf2 Kf6 29. Ke2 Ke6 30. Nc3 Kd7 31. Kd3 Kc6 32.
e4 fxe4+ 33. fxe4 Nb5 34. Nd5 Kd6 35. Kc4 Nc7 36. Nxc7 Kxc7 37. Kc5 (37.
Kd5 { is very strong, advantage 1.8 on computer. }) ({ &#91;RR } 37. Kd5 $1
{ seems to win, but why? With the aid of the Lichess Op1 tablebase, a
partial explanation emerges. In the position White: Kf5, a6, e5, g5, h5;
Black: Kd7, a7, e7, f7, h7, White plays 1. e6+! Ke8 2. Ke5!! Kf8 3. exf7
Kxf7 4. Kf5!, when Black is in zugzwang. On 4... Kf8, there follows 5. g6,
etc., while 4... Kg7 is met by 5. Ke6 Kf8 6. h6, etc. (See Note.) }) ({ On
the other hand, } 37. Kc5 { Kc5 allows } 37... Kd7 38. Kd5 e6+ 39. Ke5 Ke7
40. g4 f6+ 41. Kd4 Kd6 { , when } 42. e5+ fxe5+ 43. Ke4 Ke7 44. Kxe5 { is
drawn with best play, per the Lichess Op1 tablebase.&#93; }) 37... Kd7 38.
Kb5 Ke6 39. Ka6 $4 Ke5 $4 (39... f5 { wins. &#91;RR After } 40. e5 $1 Kxe5
41. Kxa7 Kd6 $1 { (only move) Black will be able to exchange queens and
White then falls one move short of drawing.&#93; }) 40. a4 Kxe4 41. Kxa7
Kf5 42. Kb6 e5 43. Kb5 { Black suffered a double tragedy in this game. He
resigned in a drawn position (although the draw was difficult enough to
see). Worse still, he missed a win four moves earlier when I pressed too
hard for a win in order to keep pace with Heidenfeld). On the other hand, I
would have been very close to winning after Kd5. } ({ &#91;RR } 43. Kb5 e4
44. Kc4 Kg4 $10 { and Black actually queens first. Somehow Black seems to
have miscounted. Paul Cassidy comments that he also thought that he was
winning in the final position. A case of mutual chess blindness? Or perhaps
did Paul's confidence sway his opponent's thinking?&#93; }) 1-0