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