The bottom surface of a peg is not adjacent to any tile beneath it. When the peg of a tile is placed in this hole, that tile will not be adjacent to any of the tiles D, E, or F. The peg is not deep enough to reach these tiles. There is a blocking region in the way, which is a physical gap separating the lower tiles from the tile two levels above. Everywhere three tiles on the same level meet at a single point, there is a blocking region sitting on top of that point.

Here three mutually adjacent black tiles on the board surface together form a hole. It would be legal on black's turn for black to place a tile in this hole, but not white on white's turn, because that space is not adjacent to any white tile. Of course white could play in any board surface hole, or the hole to the left, instead.

The white tile G has been added adjacent to this space on the same level. Now it would be legal on white's turn for white to play in the hole formed by the three black tiles.

Restrictions

Tiles, once placed, do not move, and are not captured. You may not pass on your move. You may not place the peg of your tile in an incomplete triangle; in other words, no overhang is allowed. If your tile is not on the board surface, it must rest directly on three other tiles.

More Definitions

Board surface tiles are on level one. Games rarely go higher than level five. A space is any position in this 3-dimensional lattice. If a tile does not occupy it, it is called a vacant space. A vacant space has the same shape and size as a tile. Spaces are adjacent (or not adjacent) to each other in the same manner that tiles are. A continuous path is a sequence of spaces that are each adjacent to the next.

The Object

• A board surface loop is a continuous path of your tiles, entirely on the board surface, which forms a loop around at least one vacant space or opposing tile.
• A 3-D loop is a continuous path of your tiles, not entirely on the board surface, that forms a loop, either with itself or with the board surface, through which a continuous path of opposing tiles (and possibly vacant spaces) can be traced.

Another way of stating the object is, a winning loop of either type must have a hole through it which does not consist of any tile of the same color. This hole must avoid all blocking regions.

Of course either player may resign at any point. You also win if you leave your opponent with no legal move before he/she runs out of pieces. But if all 190 tiles are played without a winning loop made, the game is a draw. Players may agree to a draw.

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