Raumschach

Overview

Raumschach (German for “Space Chess”) is one of the first three-dimensional chess variants, invented by Dr. Ferdinand Maack in 1907. It is played on a 5x5x5 cubic board (125 cells), arranged as five stacked 5x5 levels. Each player commands a full army including standard chess pieces plus two Unicorns, a piece unique to 3D chess that moves along space diagonals. The game follows standard chess objectives: checkmate the opponent’s King.

Components

• 1 Raumschach board: five 5x5 levels stacked vertically (levels labeled A through E from bottom to top)
• White pieces (20): 1 King, 1 Queen, 2 Rooks, 2 Bishops, 2 Knights, 2 Unicorns, 10 Pawns
• Black pieces (20): 1 King, 1 Queen, 2 Rooks, 2 Bishops, 2 Knights, 2 Unicorns, 10 Pawns

Setup

White starts on levels A and B (bottom two levels):

• Level A (rank 1): Rook, Knight, King, Knight, Rook; (rank 2): 5 Pawns
• Level B (rank 1): Bishop, Unicorn, Queen, Unicorn, Bishop; (rank 2): 5 Pawns

Black starts on levels D and E (top two levels), mirrored:

• Level E (rank 5): Rook, Knight, King, Knight, Rook; (rank 4): 5 Pawns
• Level D (rank 5): Bishop, Unicorn, Queen, Unicorn, Bishop; (rank 4): 5 Pawns

White moves first.

Turn Structure

Players alternate turns. On each turn, a player moves one piece according to its movement rules. Capturing is performed by moving onto a cell occupied by an opponent’s piece.

Actions

Piece Movement Rules

Piece	Movement
Rook	Moves any number of cells along a file, rank, or column (orthogonal movement through any single axis)
Bishop	Moves any number of cells diagonally in any coordinate plane (2D diagonal movement)
Unicorn	Moves any number of cells along space diagonals (3D diagonal, through corners of cells)
Queen	Combines Rook + Bishop + Unicorn movement (all directions)
King	Moves one cell in any direction the Queen could move
Knight	Moves as in standard chess: one cell orthogonally then one cell diagonally outward, always in the same coordinate plane. Can jump over pieces.
Pawn	Moves one cell forward (toward opponent’s side) along rank or vertically between levels. Captures one cell forward-diagonally.

Pawn Details

• No initial two-step move. Pawns always move exactly one cell.
• No en passant (since there is no two-step move).
• Promotion: White Pawns promote upon reaching rank 5 of level A or B. Black Pawns promote upon reaching rank 1 of level D or E.
• Pawns promote to any piece except King.

Scoring / Victory Conditions

• Checkmate: The game is won by placing the opponent’s King in checkmate (the King is in check and cannot escape).
• Stalemate: If a player has no legal moves and is not in check, the game is a draw.
• Draw: By agreement, threefold repetition, or 50-move rule (as in standard chess).

Special Rules & Edge Cases

• No Castling: There is no castling move in Raumschach.
• Unicorn Color Binding: The Unicorn is bound to cells of one “color” in 3D space (analogous to the Bishop’s binding in 2D chess). Each player starts with one Unicorn on each “color.”
• Increased King Mobility: The King can potentially move to up to 26 adjacent cells (vs. 8 in standard chess), making checkmate more difficult to achieve.
• Knight Power: The 3D Knight is significantly more powerful than in standard chess due to additional move options across levels.
• Notation: Cells are denoted by level letter + file letter + rank number (e.g., Ac3 = level A, file c, rank 3).

Player Reference

Piece	Directions	Range
Rook	Orthogonal (3 axes)	Unlimited
Bishop	2D Diagonal (3 planes)	Unlimited
Unicorn	3D Diagonal (4 diagonals)	Unlimited
Queen	All of the above	Unlimited
King	All of the above	1 cell
Knight	1 orthogonal + 1 diagonal	Jump
Pawn	1 forward (move), 1 forward-diagonal (capture)	1 cell