Starts with the letter '1'
- 10 Minute Melee. Score as many points during 10 minutes of time with regular chessset. (8x8, Cells: 64) By Mason Green.
- 10-directional Chess. 10-directional pieces: an augmented Knight and a restricted Chancellor. (8x8, Cells: 64) By Jörg Knappen.
- 10x10 game with some popular pieces. Missing description (10x10, Cells: 104) By Daniil Frolov.
- 10x10 Multiple Knot Chess. Board in `mathematical shape'.
- 12 Sharp Chess. 4-player versions of 10-or-more-file variants on cross-shaped boards. (12x12, Cells: 108) By Charles Gilman.
- 123456 Chess. Uses 2 dices for each player and 2 checkers for each player, in addition to normal chess pieces. (8x8, Cells: 64) By (zzo38) A. Black.
- 125 Percent Shogi and 125 Percent Xiang Qi. 4-player versions of Oriental variants on cross-shaped boards. (15x15, Cells: 125) By Charles Gilman.
- 16 Seasons Chess. 4-player variant combining FIDE and Leap Chess pieces. (10x10, Cells: 100) By Charles Gilman.
- 16Chess. Game with 4 royal pieces. By Zhedric Meneses.
Total items listed: 9