Dragonchess

Dragonchess is a three-dimensional fantasy chess variant created by Gary Gygax, co-creator of the famed role-playing game Dungeons & Dragons. The game was introduced in 1985 in issue No. 100 of Dragon Magazine.

The Dragonchess gameboard consists of three vertically stacked 12×8 levels. The upper level (blue and white) represents the air, the middle level (green and amber) represents the land, and the lower level (red and brown) is the subterranean world (Gygax 1985:34).

The Dragonchess game pieces (42 per player) are an ensemble of characters and monsters inspired or derived from fantasy settings in Dungeons & Dragons. Intricate inter- and intra-level game piece capabilities are defined. As in chess, the game is won by delivering checkmate to the enemy king.

Recording moves is done the same as in algebraic notation for chess, extended to a 12×8 board, with the addition of a numeric prefix (1, 2, or 3) in front of each square coordinate to identify the level. So for example, White's Elemental starts on square 1g1 (level 1, square g1); Black's King starts on 2g8; and so on.

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Wikipedia