Find your first move
Interactive foundations, movement labs and short challenges help you learn one idea at a time.
Start learningA NEW PERSPECTIVE ON CHESS
Think outside
the board.
Four connected boards. One shared game.
Learn to see the moves between dimensions.
Made for iPhone & iPad · Free core play · Optional Fourfold Plus
One position. Three perspectives.
INTERACTIVE STUDY W = 0 W = 1Drag to orbit
01 / CROSS A SPACE
A straight line. A different board.
The rook changes W only. Its X, Y and Z coordinates stay the same—even as it crosses to another visible board.
XYZW
Rook at (1, 1, 0, 0). Choose Show move to follow the route.
A movement example on a clear board, not a full match. Views change the projection; square addresses stay the same.
2 → 3 → 4
UNFOLD YOUR UNDERSTANDING
The board changes shape.
The game stays connected.
In 2D, read four flat boards. In 3D, separate the spaces. In 4D, rotate a projection that brings the connections into view. Every piece keeps its address.
Understand the four coordinates ↗FAMILIAR PIECES. NEW POSSIBILITIES.
A fourth coordinate.
A new way to think.
X and Y locate a square. Z and W connect the spaces. Start with one move, then change the view: the same position begins to make sense from every angle.
Change your perspective
Flat boards, a spatial view and a 4D projection all show the same position. On iPad, compare flat and spatial views side by side.
Explore the viewsMake it a shared game
Play an on-device opponent, take turns on one device, or create a private online room with a code or QR invitation.
Find your way to playA PRACTICE THAT GROWS WITH YOU
Play a game.
Keep the discovery.
Revisit a position, ask what changed, and turn a surprising move into your next practice session.
Explore Study & Fourfold Plus ↗Core play stays free
Room to explore. No rush to upgrade.
Offline and online games, Quick helper, replay, basic analysis and existing lessons are free. Plus opens deeper reviews, advanced exercises, and more ways to build your Study collection.
Compare free and Plus ↗HERE TO HELP
A question about your next move?
Find help with the game, online rooms, saved progress and subscriptions.