| Round 4 | Thu 15 Nov 12 |
| Portmarnock | 3 ½ – 2 ½ | Aer Lingus | ||||||
|---|---|---|---|---|---|---|---|---|
| Board | Colour | Player | Code | Rating | Result | Player | Code | Rating |
| 1 | Black | Babisz, Wojciech | 10344 | 1534 | ½ – ½ | Quigley, John | 1393 | 1552 |
| 2 | White | Dempsey, Michael | 323 | 1412 | ½ – ½ | Ui Laighleis, Gearoidin | 3364 | 1616 |
| 3 | Black | Jolliffe-Byrne, Govan | 16183 | 1404 | ½ – ½ | Quigley, Ben | 5218 | 1620 |
| 4 | White | Kelleher, Denis | 682 | 1406 | ½ – ½ | Keogh, Mick | 732 | 1384 |
| 5 | Black | McGrath, Brian | 5021 | 1260 | 1 – 0 | McSwiney, Arthur | 1165 | 1330 |
| 6 | White | Harbison, Keith | 12201 | 1225 | ½ – ½ | Kenny, Jim | 726 | 1273 |
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