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Round 5
16 July 1980
| Curtin (2½) |
½-½ |
Delaney (4) |
| O'Reilly (2½) |
0-1 |
Short (2½) |
| O'Hare (2½) |
w/o |
McCarthy (2½) |
| Porter (2½) |
1-0 |
Wallace (2½) |
| Cassidy (2½) |
½-½ |
Ludgate (2) |
| Littleton (2½) |
½-½ |
Carton (2½) |
| Lyons (2) |
0-1 |
Allen (2) |
| Pinkerton (2) |
0-1 |
Clarke (2) |
| McDaid (1½) |
1-0 |
O'Shea (1½) |
| McDonnell (1½) |
½-½ |
McGill (1½) |
| Quinn (1) |
0-1 |
Killane (1) |
| O'Brien (½) |
1-0 |
Cronin (½) |
Scores after round 5
| Delaney | 4½ |
| O'Hare | 3½ |
| Porter | 3½ |
| Short | 3½ |
| Allen | 3 |
| Carton | 3 |
| Cassidy | 3 |
| Clarke | 3 |
| Curtin | 3 |
| Littleton | 3 |
| Ludgate | 2½ |
| McCarthy | 2½ |
| McDaid | 2½ |
| O'Reilly | 2½ |
| Wallace | 2½ |
| Killane | 2 |
| Lyons | 2 |
| McDonnell | 2 |
| McGill | 2 |
| Pinkerton | 2 |
| O'Brien | 1½ |
| O'Shea | 1½ |
| Quinn | 1 |
| Cronin | ½ |