| Uitslagen van externe ronde 4 | 04-08-2013 |
| 1 | Erik | Wille | Z | ½-½ | 1902 |
| 2 | Martin | Weijsenfeld | W | 1-0 | 1837 |
| 3 | Ruud | Verhoef | Z | ½-½ | 1733 |
| 4 | Rob van | Belle | W | 0-1 | 1809 |
| 5 | Barth | Plomp | Z | 1-0 | 1988 |
| 6 | Nico | Schoenmakers | W | ½-½ | 1816 |
| 7 | Albert | Marks | Z | ½-½ | 1842 |
| 8 | Abbes | Dekker | W | 0-1 | 1894 |
| 1 | Robert | Naasz | W | 1-0 | 1657 |
| 2 | Jacques | Boonstra | Z | 0-1 | 1737 |
| 3 | Hedser | Dijkstra | W | 1-0 | 1656 |
| 4 | Theo van | Amerongen | Z | 1-0 | 1555 |
| 5 | Horst | Eder | W | ½-½ | 1596 |
| 6 | Marco | Braam | Z | 1-0 | 1552 |
| 7 | Liedewij van | Eijk | W | ½-½ | 1624 |
| 8 | Umit | Duman | Z | 1-0 | 1514 |
| 1 | Jan | Vermeer | Z | 0-1 | 1931 |
| 2 | Dick | Hajee | W | 0-1 | 1953 |
| 3 | Jan | Groen | Z | ½-½ | 1750 |
| 4 | Tom | Bentvelzen | W | ½-½ | 1750 |
| 5 | Tijs van | Dijk | Z | 0-1 | 1703 |
| 6 | Frits | Wiggerts | W | 1-0 | 1662 |
| 7 | Theo | Koeweiden | Z | 1-0 | 1616 |
| 8 | Ton van | Eck | W | 0-1 | 1603 |
| 1 | Hendrik van | Buren | W | 1-0 | 1639 |
| 2 | Ahmad | Rahimi | Z | 1-0 | 1710 |
| 3 | Zekria | Amani | W | 0-1 | 1620 |
| 4 | Harm | Steenhuis | Z | 1-0* | 1619 |
| 5 | Jonathan van der | Krogt | W | 1-0 | 1588 |
| 6 | Peter van | Deursen | Z | 0-1 | 1635 |
| * door OSBO verloren verklaart, vanwege te hoge ELO van Harm | |||||