| Name: | M. Posthumus |
| Federation: |  |
| Years: | 1970 - 1970 |
| Total Games: | 4 |
| Wins: | 1 (25 %) |
| Draws: | 2 (50 %) |
| Losses: | 1 (25 %) |
| Score: | 50 % |
| Tournament | Date | Elo Avg. | Country |
| Glorney Cup | 07/29/1970 | 0 |  Scotland |
| ECO | Opening | Games |
| B09 | Pirc, Austrian attack | 1 games |
| D69 | Queen's Gambit Declined, Orthodox defence, classical, 13.de | 1 games |
| E37 | Nimzo-Indian, classical, Noa variation, main line, 7.Qc2 | 1 games |
| ECO | Opening | Games |
| C44 | King's pawn game | 1 games |
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Posthumus, M | Bray, D | 1-0  |
37 | E37 | 1970 | Glorney Cup |
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| Saverymuttu, S | Posthumus, M | 1-0 |
39 | C44 | 1970 | Glorney Cup |
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| Posthumus, M | Hanau, J | ½-½ |
17 | D69 | 1970 | Glorney Cup |
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| Posthumus, M | Jones, C | ½-½ |
66 | B09 | 1970 | Glorney Cup |
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