Title text:
The draw-by-repetition rule does a good job of keeping players from sliding a tile back and forth repeatedly, but the tiles definitely introduce some weird en passant and castling edge cases.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3139/
That's an aspect to Star Trek's 3D chess, you can move the smaller platforms around in lieu of moving one of your pieces. I have no idea if it adds or subtracts from the game.
damn, i played a real one where the platforms didn’t move… they just kinda extended the board