Ghost chess is an in-universe board game invented by Miss Jones for the Ghostforce to play in the underground laboratory. It is a variation of traditional chess, but it features six pieces that represent a wild ghost that the team has captured and stored in the Ghost Cloud.
The rules for the game are similar to traditional chess where each ghost piece must be moved around a chessboard. The team uses the top of the Boo Energy recharging pad as a table that sets up a holographic board for them. While it's unknown what is the movement of each chess piece, it seems to be based on the attack range for a ghost that the piece represents.
Based on how it features a Flame piece, the game seems to have been invented after the events of "Artiflame".
There is a continuity error since "Cyclopee" took place before the events of "Artiflame" but the latter episode occurred during summer vacation. It can be interpreted that the Flame piece isn't based on the ghost that the second iteration of the Ghostforce had captured in "Artiflame". Rather, it was modeled after a different member of the Flame specimen. If that's the case, then the game was invented sometime after "Arakgum" instead.
"Cyclopee" only featured four out of the six pieces. Starting in "Somnibou", the Arak and the Mikroo pieces were added to the game.
The chess pieces are made with special Boo Technology materials for both humans and a ghost to move them. This was demonstrated in "Cyclopee" when Glups was seen moving a Pharaok piece despite he has an intangible body.
The pieces invented for the game have an even number of booster and merger ghosts with three each; Pharaok, Raijin, and Mikroo are booster ghosts, while Flame, Trashotic, and Arak are merger ghosts.
The Trashotic, Pharaok, and Raijin pieces are the only ones that don't represent a ghost's kawai mode.
Despite the Pharaok piece representing its booster mode, it lacks the ghost's two arms.
The game doesn't represent any fractal or flexible ghosts for its chess pieces.
Andy Baker is the only member of the second iteration of the Ghostforce to never play a round.
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