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The Starbound Sliders. 
??? By Andrew L Smith.
- Airplane Chess. By M Winther.
- Zeppelin Chess. By M Winther.
- SquireKnight. Squire Knight combines Knight and Forward/Backward Pawn like moves. (8x8, Cells: 64) By Stephane Burkhart.
- SPQR. The perfect battle formation of Roman infantry. (12x12, Cells: 144) By Florin Lupusoru.
- Spartan Chess 28. Missing description (4x7, Cells: 28) By Graeme C Neatham.
- SOHO Chess. Chess on a 10x10 board with Champions, FADs, Wizards & Cannons. (10x10, Cells: 100) By Kevin Pacey.
- Small-Deacon Chess. Missing description (7x7, Cells: 49) By (zzo38) A. Black.
- SliderChess. Variant of Capablanca Chess with two extra Bishops per side replacing the Archbishop and Chancellor. By James Zuercher.
- Skirmish56 Chess. This is Skirmish Chess on an Simplified Chess board. (7x8, Cells: 46) By Rich Hutnik.
- Skirmish Chess. Tony Paletta's modest variant (8x8, Cells: 64) Author: Rich Hutnik. Inventor: Tony Paletta.
- Skandaran Chess. Large variant with 32 pieces per side. (12x12, Cells: 144) By Francisco Marzoa.
- Sinyeonsanggi (新演象棋). snowmoondaphne By Daphne Snowmoon.
- Sino-European Chess. Missing description (9x9, Cells: 81) By Andy Thomas.
- Simplified Makpong. Makruk variant. By Henk Drost.
- Simplified Chess. fixed cell count. (8x7, Cells: 56) By John Kipling Lewis.
- Simplified chess. Simple subset of the chess rules. (8x8, Cells: 64) By Michiel Tas.
- Simpleton's Chess. This is an even simplier version of Simplified Chess. (7x8, Cells: 56) By Rich Hutnik.
- Silver Elephant Chess. Missing description (10x8, Cells: 80) By Jose Carrillo.
- Short Leaper Chess. Missing description (8x8, Cells: 64) By Petar Djurickovic.
- Shatranj Kamil X. Shatranj Kamil with Chinese Cannons and Padwars (Jetan). Historical information added. (10x10, Cells: 100) By David Paulowich.
- Shatranj Darwinian. Missing description (9x9, Cells: 81) By Gary K. Gifford.
- Shatranj al-Sultan. Normal Chess + Alibaba , with a Sultanic flavour . (10x8, Cells: 80) By Abdul-Rahman Sibahi.
- Shatar, Old 1 Hia. Old Shatar with one Hia. (8x8, Cells: 64) By Gary K. Gifford.
- Samnis Chess. By M Winther.
- Shambhala chess. Maybe, it's the misterious first form of chess? Actually, most probably, not. (8x8, Cells: 64) By Daniil Frolov.
- Shako_Balbo. Game with Diamond Shape Board. By wdtr2.
Scorpion Chess. Poisonous Scorpions instead of pawns. By M Winther.
- Scout Chess. By M Winther.
- Schoolbook. 8x10 chess with the rook + knight and bishop + knight pieces added. (10x8, Cells: 80) By Sam Trenholme.
- Sage Chess. Missing description (8x16, Cells: 128) Author: Andrew Wong.
- Univers Chess. Added photograph (10x8, Cells: 80) By Fergus Duniho.
- Unicorn Great Chess. Replaced ASCII diagram with graphic image (10x10, Cells: 100) By David Paulowich.
- Two Large Shatranj Variants. Missing description (10x10, Cells: 100) By Joe Joyce.
- Twin-board Ecumenical Chess. Array diagram converted to new-style virtual single image (Cells: 128) By Charles Gilman.
- Troitzky Chess. Troitzky Chess by Paul Byway, standard pieces on irregular board (with zrf). Author: M Winther. Inventor: Paul Byway.
- Trampoline Chess. Each player has a Trampoline that allows friendly pieces to make a second move. (8x8, Cells: 64) By Mark Thompson.
- Titan Chess. Chess featuring dozenal board and seven diverse new pieces with multiple capture mechanisms and movement modes. (12x12, Cells: 144) By Charles Daniel.
- Tigrey. Combination of Expanded Chess and Tiger Chess. (12x12, Cells: 144) By Daniel Zacharias.
- Tiger Chess. A large game with fast-moving pieces. By Daniel Zacharias.
- Thraex_Chess. By M Winther.
- Third runner. Missing description (12x8, Cells: 96) By Daniil Frolov.
- There is no queen, but 2 compounds. Missing description (9x9, Cells: 81) By Daniil Frolov.
- The Big Battle Chess. Missing description (10x10, Cells: 100) By Namik Zade.
- Texas Two-Step: an obscure political commentary. A non-competing 45 Square Contest entry. (5x9, Cells: 45) By Joe Joyce.
- Teutonic Knight"s Chess. Added a note on the relation archchancellor--colonel (of the Nutty Knights) (8x10, Cells: 80) By Jörg Knappen.
- Expanded Chess. An attempt at a logical expansion of Chess to a 10x10 board. By Daniel Zacharias.
- Templar Chess. Features the unorthodox Templar on a board with eight extra squares. (8x10, Cells: 72) By Adrian Alvarez de la Campa.
- Vivarta Chess. he rules are simple. Each piece automatically transforms into a different piece every time it moves. Pawns transform into Knig. By Вадря Покштя.
- Victorian Chess. Capablanca variant with the most powerful pieces starting on the outside. (10x8, Cells: 80) Author: John Kipling Lewis and Greg Strong. Inventor: John Kipling Lewis and David Paulowich.
- Venomous. New system of chess on 10x10 board with new pieces: the Sorcerer Snake and the even more venomous Sissa. (10x10, Cells: 100) By Charles Daniel.
- Venator Chess. By M Winther.
- Veles Chess. By M Winther.
- Withdrawing Chess. Any piece can withdraw from other pieces to capture them. (8x8, Cells: 64) By (zzo38) A. Black.
- Wildebeest Decimal Chess. A Wildebeest Chess adaptation to the decimal board. By Erik Lerouge.
- Wildebeast9. A Variant of Wildebeast Chess. By wdtr2.
- Wide SOHO Chess. Chess on a 12x10 board with Archbishops, Marshalls, Champions, FADs, Wizards & Cannons. By Kevin Pacey.
- Wide Nightrider Chess. Chess on a 12x10 board with Nightriders, Champions and fast castling rules. By Kevin Pacey.
- Wide Chess. Chess with 2 types of non-colourbound elephants added on a 12x8 board using fast castling rules By Kevin Pacey.
- Warmachinewazir-Spiel. panther (12x8, Cells: 96) By Kevin Pacey.
- Warmachinewazir Chess. panther (10x8, Cells: 80) By Kevin Pacey.
- The War of World`s Warriors Chess. The War of World`s Warriors Chess (10x10, Cells: 100) By Namik Zade.
- Waffle Chess. Chess on a 10x8 board with waffles added. (10x8, Cells: 80) By Kevin Pacey.
- WAD Chess. Chess on a 10x8 board with WADs (Champions) added. (10x8, Cells: 80) By Kevin Pacey.
- Xiangaroo. Array diagram converted to new-style virtual single image (9x10, Cells: 90) By Charles Gilman.
- Xiang Courier. Array diagram converted to new-style virtual single image (12x10, Cells: 120) By Charles Gilman.
- Xadrez Galego. Queen, Rook and Bishop may also jump as a knight. Author: Florencio Gonzalez. Inventor: C. G. Lewin.
- ZigZag Madness. Featuring the crooked dual path sliders: the ZigZag Bishop and the ZigZag Rook. (10x10, Cells: 100) By Charles Daniel.
- Zabel-Schach. A modest chess variant with an alternative pawn, the Zabel pawn. (8x8, Cells: 64) By Jörg Knappen.
Variants playable against the diagram's AI. Index of variants that can be played against the interactive diagram. By H. G. Muller.
Week ending April 05, 2025
Week ending March 29, 2025
Week ending March 08, 2025
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