Items Invented by Federik Hendrik von Meyenfeldt
- Patrol chess. In order to capture or give check, a piece [including kings] must be `observed' by another piece of the same player. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Federik Hendrik von Meyenfeldt.
- Patrol Chess. A unit may not capture or give check unless it is supported. Author: Ed Friedlander. Inventor: Federik Hendrik von Meyenfeldt.