Zillions
Sacred King Chess 
. It is not legal to check your opponent's King, so victory is by stalemate or bare King. By Peter Aronson.
- Samarcanda . Variant of Mideast Chess with Crooked Bishops. By Nuno Cruz.
- Sanctuary . 46-cell game with elements from Xiang Qi. By Jeremy Pflasterer.
- Sankaku Shogi . Small Shogi variant played on a board of 44 triangles with no drops and a teleporting Emperor. By Larry L. Smith.
- Save the Standard . Zip file containing zrf and graphics for 7x7 and 13x13 home fields. By Graeme C Neatham.
- Schachdame . Variant between Checkers and Chess. Author: Uwe Wiedemann. Inventor: Heinrich Richter.
- Schachmühle . Morris game played on a Chessboard with Chess pieces. Author: Uwe Wiedemann.
- Schizophrenic Chess . Game on 12x7 board with Left and Right Schizzys, Bobbers, Teleporters and other exotic pieces. Author: Peter Aronson. Inventor: David Short.
- Schoolbook . Zillions file for Schoolbook. By Sam Trenholme.
- Schoolbook (updated) . Missing description By Sam Trenholme.
- Scion . Missing description By Larry L. Smith.
- Scirocco (original) . On ten by ten board with over thirty different pieces. By Adrian King.
- Scirocco (revised) . On ten by ten board with over thirty different pieces. By Adrian King.
- Seenschach . Variant on 10 by 10 board with lake in the middle and new pieces. Author: Peter Aronson. Inventor: Jörg Knappen.
- The Seeping Switchers . An army for Chess with Different Armies based on pieces that change color when they move. Author: Peter Aronson. Inventor: Jörg Knappen.
- Separate . Queens start trapped behind enemy lines. Author: Uwe Wiedemann. Inventor: Brian Wong.
- Separate Realms Chess . Pieces capture like normal FIDE pieces, but have limited moves that only take them to part of the board when not capturing. Author: Peter Aronson. Inventor: Michael Nelson and Peter Aronson.
- Shako . Cannons and elephants are added in variant on 10 by 10 board. (10x10, Cells: 100) By Jean-Louis Cazaux.
- Shamanic Chess
. Pieces may be transformed into 'Shamans'. By M Winther.
- Shanghai Palace Chess . Download these files to play this blend of Chinese, Japanese and Western Chess with Zillions of Games. Author: Larry L. Smith. Inventor: Gary K. Gifford.
- Shatra . Old game from the Altai from Russia, on special shaped board with draughts-like capture. Author: Francis Monkman.
- Shatranj . The widely played historic Persian game, predecessor of modern chess. Author: Tony Quintanilla.
- Shatranj . Version with fancy graphics. Author: David Howe.
- Shatranj Elephants. Missing description By Christine Bagley-Jones.
- Shatranj Elephants. Shatranj-like game, but with all short-range, limited-capturing pieces. By Christine Bagley-Jones.
- Shatranj for Four. 4-handed Shatranj. Author: M Winther.
- Shatranj of Troy. A Shatranj variant with Shogi-like drops, a Trojan Horse (with 6 pieces inside). Author: Larry L. Smith. Inventor: Gary K. Gifford.
- Shatranj Plus . Play four large historical variations of Shatranj including Tamerlane Chess! Author: Malcolm Maynard.
- Shifting Sands Chess . Special squares -- which can be dropped and moved -- change the types of pieces that land on them. By Tony Quintanilla.
- Shock Troops . Make a regular move or drop one of two pieces into a vacant space in the back rank. By Charles Daniel.
- Shogi . Westernized version using Alfaerie graphics. Author: David Howe and Fergus Duniho.
- Shogi 3D. Three dimensional version of Japanese Chess. By Larry L. Smith.
- Shogi, Mortal Shogi, and Kamikaze Mortal Shogi . Play Shogi and a couple variants with diminishing pieces. Author: Fergus Duniho. Inventor: Fergus Duniho and Roberto Lavieri.
- Shogi, Mortal Shogi, and Kamikaze Mortal Shogi . Optimized ZRFs for Japanese Chess and some recent variants. Author: Fergus Duniho.
- The ShortRange Project . Missing description By Christine Bagley-Jones and Joe Joyce.
- Shuffle Version Azchess . Missing description By Namik Zade.
- Simple Marseillais Chess . Simplified version of Marseillais Chess. By Fergus Duniho.
- A Simple Proposal. Variant where promotion may occur on the 7th or 8th rank, and may be delayed, but only to captured pieces. Author: Peter Aronson. Inventor: Ted Clancy.
- Sino-European Chess . Missing description By Andy Thomas.
- Sissa . Variant on 9 by 9 board with Sissa's, which move like a Bishop than a Rook, or like a Rook, then a Bishop. Author: Uwe Wiedemann. Inventor: Carlos Cetina.
- Sittyuin and Makruk. Zillions file to play Burmese Chess and Thai Chess. Author: Malcolm Maynard.
- Skandaran Chess. Download Skandaran Chess at Zillions Website. By Francisco Marzoa.
- Skirmish Chess . Pawns start on the 3rd and 6th ranks with no double-move, pieces on the 2nd and 7th ranks. Author: Marek14 . Inventor: Tony Paletta.
- Sky . Missing description By Christine Bagley-Jones.
- Slanted Escalator Chess . Chess on an asymmetric board with interesting connectivity. Author: Peter Aronson. Inventor: David Short.
- Slide Chess . Variant on 44 squares with moving cages. Author: Antoine Fourrière. Inventor: João Pedro Neto.
- Smegi . Arrows on squares show where pieces can go - crossover between Smess and Shogi. By Fergus Duniho.
- Smess . Produced and sold in the early 70's by Parker Brothers. Arrows on squares determine direction pieces can move. Author: Fergus Duniho.
- Snake Chess . A variant played on a 2 by 12 cyclindrical board. Author: Peter Aronson. Inventor: Sergey Sirotkin.
- Snark Hunt . Variant with unequal armies on board with 41 squares, inspired by a poem of Lewis Carroll's. By Peter Aronson.
- Solitaire chess puzzles . Several chess puzzles to try with Zillions of Games. Author: Uwe Wiedemann.
- Spacious Cannoneers . Experimental Army for Chess with Different Armies vs the traditional CDA Armies. Author: Peter Aronson. Inventor: Ralph Betza.
- Spacious Torus Chess . Chess on a toroidal board, using Ralph Betza's spacious pieces. By Jianying Ji.
- Spartan Chess 28 for Zillions . Zip file with Zillions rules file and graphics. By Graeme C Neatham.
- Spherical Guard Chess . Play with either the single-board or dual-board sphere projection . By Graeme C Neatham.
- Spinal Tap Chess . Variant on an 11x11 board with a once-a-game mass 'Battle Move' of Pawns and Crabs. Author: Peter Aronson. Inventor: David Short.
- Spinal Tap vs Terror Chess . The Spinal Tap Chess army vs the Terror Chess army in the battle of the 11x11 variants. Author: Peter Aronson. Inventor: David Short.
- Springermühle . Chessboard Morris game played with Knights. Author: Uwe Wiedemann.
- Squadron Chess. Uses only one type of piece besides the King. By Ken Franklin.
- Squarcle Chess . Orthogonal pieces travel in square loops, diagonal pieces reflect. Author: Fergus Duniho. Inventor: Christan Hupp.
- SSShess . Missing description By Namik Zade.
- Stability Chess. Designed to minimize the first-move advantage by white, maximize fairness, and simplify the rules of chess. Author: Larry L. Smith. Inventor: Various.
- Star Pool Chess . Large variant of Makruk, with a center non-square that acts as a bridge. Author: Peter Aronson. Inventor: Peter Aronson and Tony Quintanilla.
- Stationary King Chess . Kings can't move. Author: Uwe Wiedemann.
- Stations . Missing description By Larry L. Smith.
- Stealth Ninja Chess . Dynamic but balanced game with short-range leapers, and unusual sliding pieces: the Stealth Gryphon and Anti-Gryphon. By Charles Daniel.
- Step and Circle TrigChess . contains rules file with 2 boards and 2 piece sets. By Graeme C Neatham.
- Step by Step Handicap Chess . Missing description By Namik Zade.
- Sting . A game where Kings can move like Grasshoppers in addition to their normal move. Author: Uwe Wiedemann.
- Storm the Ivory Tower . Play this Smess adaptation of Chinese Chess with Zillions of Games. By Fergus Duniho.
- Straights . Chess-like Naval Battle game from the end of the 19th Century. Author: Young-Hyun Joo. Inventor: Anne Marriot Watson.
- String Chess. A one-dimensional variant with a fairy theme. Author: Mathew M. Burke. Inventor: Aaron Hall.
- Subway Chess . In a turn, player moves first middle subway part of board and then a piece. Author: Peter Aronson. Inventor: Francois Tremblay.
- Sudden Death Chess . A piece must be sacrificed after each non-capturing move. By Doug Chatham.
- Sudoku Chess . Missing description By Doug Chatham.
- Sudoku War . A fight that takes place in a Sudoku. By Joost Aan de Brugh.
- Sunflower HexChess Zillions zip . Sunflower HexChess Zillions rule file. By Graeme C Neatham.
- Super Chess III . Big proprietary game with archers and cyclopses. Author: Larry L. Smith. Inventor: Ed Ginsberg.
- Super Knights Grand Chess . The original Super Knights with the Archbishop, Amazon, and Chancellor, as well as two more exciting and innovative games. By Charles Daniel.
- Super Maharadscha . Missing description By Namik Zade.
- Swap Chess. A move can consist of a series of pieces swapping places. By João Pedro Neto.
- Swapmate Chess . Missing description By Adrian Alvarez de la Campa.
- Switching Chess. In addition to normal moves, switch with an adjacent friendly piece. By Tony Quintanilla.
- Switching Realms Chess . All noncapturing moves must change the board subset a piece occupies. Author: Peter Aronson. Inventor: Jörg Knappen.
- Symmetric Sissa . Variant on 9 by 9 board with symmetric setup and two Sissa's (generalized Knight-like sliders). Author: Uwe Wiedemann. Inventor: Carlos Cetina.
- Symmetrical Chess Collection. Collection of several large symmetric chess variants with only line pieces. Author: Derek Nalls and Larry L. Smith. Inventor: Derek Nalls.
- Symmetron! 112 . Large version of Symmetron!, with a third modifier. By Antoine Fourrière and Roberto Lavieri.
- Symmetron! 44 . Most pieces move orthogonally or diagonally according to situation. By Antoine Fourrière and Roberto Lavieri.
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