Items Invented by Jens Baek Nielsen
- Darkness Chess. You have only limited information on where your opponents pieces are. (8x8, Cells: 64) By Jens Baek Nielsen.
- Rooksquare Chess. Win by moving piece to corner at opponent's side. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Jens Baek Nielsen.
- Twiknight. Knights can make one double move a game, and always check with a double move. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Jens Baek Nielsen.
- Dark Chess. You have only limited information on where your opponents pieces are. Author: Ed Friedlander. Inventor: Jens Baek Nielsen.
- Dark Chess II. You have only limited information on where your opponents pieces are. Author: Ed Friedlander. Inventor: Jens Baek Nielsen.
- Rook Square Chess. Enemy rook squares are royal. Author: Ed Friedlander. Inventor: Jens Baek Nielsen.
- Dabbaba. Freeware program playing chess and a number of chess variants. Author: Hans L. Bodlaender and Jens Baek Nielsen. Inventor: Jens Baek Nielsen.
- Dark Chess . You can see all of your pieces, but only those of your opponent that you attack. Author: Andreas Kaufmann. Inventor: Jens Baek Nielsen.
- Rooksquare Chess . Win by moving piece to corner at opponent's side. Author: Uwe Wiedemann. Inventor: Jens Baek Nielsen.
- Twiknight . Knights can make one double move a game, and always check with a double move. Author: Peter Aronson. Inventor: Jens Baek Nielsen.