Starts with the letter 'I'
- Illusionary Piece Chess. A piece and a Pawn on each side are more powerful, but can not offer check or prevent bare King. (8x8, Cells: 64) By Peter Aronson.
- Imperial Cheops. Played on a pyramid field of thirteen 3x3x3 cubes. Inspired by a description in Frank Herbert's novel Dune. By Larry L. Smith.
- Imperial Chess Graphics. Graphics for Imperial Chess. Author: James Killian Spratt.
- Imposter Chess . Exchange captured pieces in order to move Kings in different ways. Author: Laila W. Stefan and Andrew Newman. Inventor: Laila W. Stefan.
- Imposter Chess. Play this game! Exchange captured pieces in order to move Kings in different ways. Author: Tony Quintanilla and Laila W. Stefan. Inventor: Laila W. Stefan.
- Infantry Chess. Small chess variant with short range pieces. (9x9, Cells: 43) By Erez Schatz.
- Infantry Chess . Small chess variant with short range pieces. Author: Uri Bruck. Inventor: Erez Schatz.
- Infinite Ring Chess. Experimental variant with board shaped as ring. (16x4, Cells: 64) By Robert J. Bell.
- Influence Chess. Pieces on the top or bottom layer influence which chess pieces may move on the middle layer. (4x7x3, Cells: 84) By Samuel H. Bell.
- Influence Chess . Pieces on the top or bottom layer influence which chess pieces may move on the middle layer. Author: Jens Markmann. Inventor: Samuel H. Bell.
- Inside-out chess. With two kings per player and squares with a square inside. (6x6, Cells: 44) By Maarten Bodlaender.
- Invasion. A military inspired Chess variant played on an 84-square board. Author: Antoine Fourrière. Inventor: Jean-Louis Cazaux.
- Invent-and-Play. A design contest and a small PBEM tournament, combined! Author: Glenn Overby II. Inventor: Hans L. Bodlaender.
- Isis and Cam. Two variants based on ancient English universities and the rivers near them. (6x8, Cells: 48) By Charles Gilman.
- Island Chess. Some connections between squares are missing. By Karl Scherer.
Total items listed: 15