Also known as Star Trek Chess, or 3D chess sometimes. How do you play? How does it work? It always seemed confusing, because as hard as chess can be, how do you play on three boards? And where do you put your pieces?
"THIS IS THE MOST COMPLEX FORM OF THE ANCIENT GAME OF CHESS YET DEVISED. IT IS NORMALLY STUDIED AND ATTEMPTED ONLY BY PERSONS WITH MASTER'S SKILLS IN THE ORDINARY FORM OF THE GAME."
Well lets begin with the board.

https://sketchfab.com/3d-models/star-trek-chess-43fc53039ef6420f9e745bdca14dd39e
["Star Trek chess" (https://skfb.ly/oBAD6) by Gipfelgrmpf is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).]
Today I was looking inside the
Archived 1975 Starfleet Technical Manual

[ "TM.3738260-3 STAR FLEET TECHNICAL ORDER
AUTHENTICATED STARDATE 7503.12 Starfleet Technical Manual]
The Board has three levels.

I still needed more information, so I found a video that explains nicely.
A few things clicked in my brain when I saw the board from above like this.

This is how you place your Pieces on the board.

Imagine your opponents ships floating high above!

It become chess, in outer space. Essential for all Bridge Officers.
Read the Starfleet Technical Manual and start playing Tri-Dimensional Chess!