Overview
Genre
| 2# | 2 | Overview | Omit | Problems |
Authors
| Hartong, Jan | 2 | Overview | Omit | Problems |
| Niemeijer, Meindert | 1 | Overview | Omit | Problems |
Sources
| 2345 Chess Problems | 1 | Overview | Omit | Problems |
| Chess Problems: Introduction to an Art | 1 | Overview | Omit | Problems |
| Der Standard (Wien) | 1 | Overview | Omit | Problems |
| FIDE Album 1914-1944/I | 1 | Overview | Omit | Problems |
| Good Companions | 1 | Overview | Omit | Problems |
| Jaarboek NBvP | 1 | Overview | Omit | Problems |
| Opfer-Opfer-Matt | 1 | Overview | Omit | Problems |
| Scobs lignea | 1 | Overview | Omit | Problems |
Keywords
| Grimshaw | 2 | Overview | Omit | Problems |
| Sammlung Brian Stephenson | 2 | Overview | Omit | Problems |
Computer tested
| not C+ | 2 | Overview | Omit | Problems |
Cooked
| not cooked | 2 | Overview | Omit | Problems |
https://pdb.dieschwalbe.de/overview.jsp?expression=COMMENTDATE%3E%3D20200919+AND+NOT+K%3D%27Hilfsr%C3%BCckz%C3%BCger%27+AND+K%3D%27Grimshaw%27+AND+G%3D%272%23%27+AND+NOT+CPLUS++AND+A%3D%27Hartong%2C+Jan%27