• Board
• Objective
• Definitions
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Clamber is played on a hexagonal board. The standard game uses a board with three cells per side, while a variant with four cells per side is also available.

There are two players: Blue and Red. Each player has an unlimited supply of stackable pieces of their color.

The goal of the game is to leave the opponent without any stacks on the board. A player wins as soon as their capture leaves the opponent with no stacks.

A stack is one or more pieces on the same cell. It belongs to the player whose piece is on top. The height of a stack is the number of pieces in it, shown by the number on the stack.

A singleton is a stack of height 1.

A group consists of all stacks of one color that are connected to each other through adjacent stacks of that color, regardless of their height.

A subgroup consists of all stacks of one color and one height that are connected to each other through adjacent stacks of that color and height.

The outlined Blue stacks form a group. The Blue stack on A3 is not connected to them, so it belongs to another group.		The outlined Blue stacks of height 2 form a subgroup. The Blue stack on B2 also has height 2 and belongs to the same group, but it is not connected to them through stacks of height 2.

The game begins with an empty board.

Players move alternately, starting with Blue.

On each turn a player performs one of the following actions:

• Place a singleton of their color on any empty cell.
• Make one or more captures.

Capturing

A capture is made by one of the player's stacks, which stays in place. The captured stack is capped with one of the player's pieces: it becomes the player's stack and its height grows by one. The rest of the opponent's subgroup to which the captured stack belonged is removed from the board.

There are two kinds of captures:

• Lower-stack capture: a stack may capture an adjacent opponent's stack of lower height. This capture ends the turn.
• Equal-height capture: a stack may capture an opponent's stack of the same height that belongs to an opponent's group adjacent to it. The captured stack itself does not need to be adjacent. After an equal-height capture, the newly captured stack may make another equal-height capture, and so on. The player may stop after any capture.

A turn consists either of one lower-stack capture or of one or more equal-height captures. The two kinds cannot be combined.

Below is an example of a lower-stack capture:

Before: the Red stack on C3 has height 3 and may capture the adjacent Blue stack on D3 of height 1. The outlined stacks are the subgroup of D3.		After: D3 is capped and becomes a Red stack of height 2. The rest of its subgroup, on D4 and E4, is removed. The Blue stack on E3 has height 2, so it stays. The capture ends Red's turn.

Below is an example of two equal-height captures in one turn:

The Blue stack on B2 has height 2. The Red stack on C4 has the same height and belongs to the Red group adjacent to B2 through B3, so Blue may capture it. The outlined stacks are the subgroup of C4.		C4 becomes a Blue stack of height 3 and D4 is removed. Blue may continue from C4: the Red stack on E5 has height 3 and belongs to the Red group adjacent to C4 through D5. The outlined stacks are the subgroup of E5.		E5 becomes a Blue stack of height 4 and E4 is removed. No further equal-height capture is possible from E5, so Blue's turn ends.

If a player has no legal move, the turn is skipped. Passing is not allowed.

• Clamber on BoardGameGeek.