[Event "Armstrong Cup 1955-56"]
[Site "Dublin IRL"]
[Date "1956.01.05"]
[Round "6.1"]
[White "McMahon, Michael"]
[Black "O'Sullivan, Donal J."]
[Result "1-0"]
[WhiteTeam "Kevin Barry"]
[BlackTeam "Colmcille"]
[PlyCount "45"]
[ECO "E94"]
[Opening "King's Indian"]
[Variation "orthodox, 7...Nbd7"]
[EventDate "1955.11.07"]
[EventType "team"]
[Source "Irish Times 23 Mar 1956 p4"]
[URL "https://www.irlchess.com/games_archive/sundry_files_2021-11/mcmahon-osullivan-armstrong-1956.htm"]
[LastModified "Fri Sep 26 16:48:44 2025"]

{ Source: <em>Irish Times</em>, March 23, 1956 p. 4. }

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Nbd7 7. O-O e5 8.
d5 Nc5 9. Nd2 a5 10. Qc2 c6 11. Nb3 cxd5 12. cxd5 b6 13. Nxc5 bxc5 14. b3
Rb8 15. Bd2 Bg4 16. Bxg4 Nxg4 17. h3 (17. f3 $16) 17... Nh6 $4 (17... Nf6
18. g4 $14) 18. Qc1 Qh4 19. Bg5 Qh5 20. Be7 Rfc8 21. Bxd6 Rb7 22. Na4 Rd7
23. Nb6 1-0