This tournament, sponsored by Niemeijer, quickly grew out to one of the major junior tournaments in Europe. After five editions, a qualification stage was added. Two Belgians managed to qualify for the A-final: Rooze, who shared 3rd place with Timman and Westermeier, and Goormachtigh. From the 10th edition on, the winner was awarded the official title of European junior champion. After the 1974-75 edition, Gasunie took over the sponsoring of this championship and, with that, the Niemeyer tournament disappeared from the calendar.
| Year | 1 | 2 | 3 | # | Belgian | ||
| 1963 | Zuidema (NED) 7½ | Richardson (ENG) 7 | Scholl (NED) 5½ | RR | 10 | 6. | M. Bratzlavsky 3½ |
| 1964 | Hartoch (NED) 7½ | Sloth (DEN) 7½ | Hübner (GER) 7 | RR | 10 | 10. | P. Van Herck ½ |
| 1964-65 | Hübner (GER) 9 | Ree (NED) 9 | Bleiman (ISR) 8½ | RR | 12 | 10. | R. Verstraeten 3½ |
| 1965-66 | Ree (NED) 8 | Whiteley (ENG) 8 | Kupreichik (URS) 7½ | RR | 12 | – | – |
| 1966-67 | Steinberg (URS) 6 | Whiteley (ENG) 4 | Timman (NED) 3½ | RR+RR | 16 | 4. | J. Rooze 3½ |
| 1967-68 | Karpov (URS) 5½ | Adorján (HUN) 5 | Lewi (POL) 4½ | S7+RR | 16 | 14. | R. Meulders 3½ |
| 1968-69 | Mäder (GER) 7 | Vaganian (URS) 7 | Ribli (HUN) 7 | S7+RR | 20 | 20. | L. Teirlinck 2 |
| 1969-70 | Adorján (HUN) 7 | Ljubojević (YUG) 6½ | Beliavsky (URS) 6 | S7+RR | 24 | 23. | M. Roofthoofd 4 |
| 1970-71 | Ribli (HUN) 7½ | Beliavsky (URS) 6 | Borngässer (GER) 5½ | S7+RR | 26 | 14. | R. Meulders 4½ |
| 1971-72 | Sax (HUN) 7 | Borngässer (GER) 7 | Velikov (BUL) 6 | S7+RR | 30 | 30. | D. Luminet 3 |
| 1972-73 | Romanishin (URS) 7½ | Miles (ENG) 6½ | Buchal (GER) 5½ | S7+RR | 30 | 24. | R. Weemaes 5 |
| 1973-74 | Makarichev (URS) 7 | Pintér (HUN) 7 | Kuligowski (POL) 5½ | S7+RR | 32 | 9. | J. Goormachtigh 2½ |
| 1974-75 | Nunn (ENG) 6 | Székely (HUN) 6 | Podzielny (GER) 5½ | S7+RR | 28 | 21. | G. Deleyn 5½ |