Items Invented by Oyama Yasuharu
- Five-Minute Poppy Shogi. Small shogi variant on a 4 by 5 board. (4x5, Cells: 20) Author: Hans L. Bodlaender. Inventor: Oyama Yasuharu.
- Microshogi . Small shogi variant on a 4 by 5 board. Inventor: Oyama Yasuharu.
Check out Glinski's Hexagonal Chess, our featured variant for May, 2024.