Same pieces. Same rules. Three levels of play.
It's not as complicated as it sounds
The most common reaction from first-time players is surprise at how quickly the rules click. If you can play regular chess, you can learn 3D Chess in a single session.
Lynn R. Johnson, the game's inventor, put it well in his original 1971 guide:
"When playing 3-D Chess, you are not playing more than one game; however, you do play on more than one level. By playing on more than one level, you play a game that has depth — which is what the third dimension really is: length, width, and depth."
Every rule of regular chess carries over exactly. The third dimension simply extends what pieces can already do.
The Board
The game is played on three 8×8 boards stacked vertically:
Squares are identified by level number + file letter + rank number. For example: IIA4 means Level II, file A, rank 4.
White pieces set up on Level I. Black pieces set up on Level III. Both sides face inward toward Level II.
Strategic note: Level II is the center of the game. Controlling it is the equivalent of controlling the center of the board in regular chess — but more powerful, because pieces on Level II can influence both Level I and Level III simultaneously.
How pieces move between levels
Every piece moves exactly as it does in regular chess — but now it can also move vertically between levels. Here's how each piece's movement extends into the third dimension:
Moves horizontally or vertically on its current level as normal. To change levels, the Rook moves straight up or straight down — it must land on the same file and rank it left from. It cannot move diagonally between levels.
Moves diagonally on its level as normal. When changing levels, the Bishop must move one square diagonally for each level changed. It cannot move straight up or down.
Has the greatest range in the game. The Queen can move in any direction the Rook or Bishop can, including across levels. She can move straight up or down (like the Rook) or diagonally between levels (like the Bishop). This makes her extraordinarily powerful in 3D Chess.
Moves one square in any direction, including diagonally and vertically. The King can change levels, but only one level per move.
The Knight's L-shaped move applies across levels as well. It can jump to any square that is two squares in one direction and one square perpendicular — including across level boundaries. Knights are particularly unpredictable in 3D Chess for this reason.
Pawns move forward one square at a time (two squares on their first move) on their own level. They can also move straight up or down one level — but this counts as a move and the Pawn must land on the square directly above or below. Pawns capture diagonally as in regular chess, including diagonally across one level. En passant applies across levels.
Key rule: A piece on one level is never blocked by a piece on a different level unless that second piece is directly in the movement path on a different level. Example: a Rook on Level I moving horizontally is not blocked by a Rook sitting on the same square on Level II.
Blocking, Check, and Checkmate
A piece can only block movement on its own level. A piece on Level II sitting on E4 does not block a Rook on Level I moving along rank 4. They occupy the same coordinates on different planes — but the Rook passes under it freely.
Check and checkmate work the same as in regular chess. A King on Level II is harder to checkmate than a King on Level I or III — because it can escape to either adjacent level. To checkmate a King on Level II, you must control all the squares it could flee to on all three levels simultaneously.
A typical checkmate: The opponent's King is on Level I. Your Queen sits directly above it on Level II. Your Rook is positioned on Level II to protect the Queen. The King has no legal move.
A Pawn promotes to any piece of your choice when it reaches the far end of the board — regardless of which level it's on when it gets there.
Castling rules from regular chess apply on the home level. A King that has moved to another level and back has lost its castling right.
First game tips
Want to go deeper?
The game includes a quickstart instruction booklet to get you playing right away. For the full treatment — annotated example games, every special move, strategy, and a complete glossary — Lynn R. Johnson's original 1971 guide is available here on the site, free.
Still have questions? The FAQ page covers the most common rules questions from players.