Inverted Movement
The selected piece holds its position. The rest of the board slides in the opposite direction.
Relative Chess
A variant of chess where the board moves, rather than the pieces.
Dual-Board System
An 8×8 inner board floats inside a configurable outer board, 10 to 32 squares wide.
Death by Edge
Pieces pushed past the outer boundary are captured. Board control becomes its own kind of attack.
Two Reference Frames
Switch between Aristotelian mode (the board recentres) and Leibnizian mode (the board drifts freely).
Full Chess Rules
Castling, en passant, underpromotion, and proper time controls all still apply.
Three AI Levels
Easy, Medium, Hard — powered by minimax with alpha-beta pruning over the variant's mechanics.
Four Time Formats
Bullet, Blitz, Rapid, and Classical, each with optional increment.
Five Synthwave Themes
Pick the palette that fits your mood. Themes toggle live without losing your game.
Privacy
Runs entirely in your browser. No accounts, no server-side game storage.
No tracking, no analytics. Saved games live as JSON files you own.
Requirements
Platforms
Modern browser (ES6 + HTML5 Canvas)
Site
relativechess.org
Account
None
Price
Free
