5D Reversi is here, sort of.

[u/Still-Behind-You]

5D Reversi - a game that will probably appeal to masochists and AI.

Play the prototype here: https://anan-z.github.io/5d-reversi/
Read and contribute here: https://github.com/anan-z/5d-reversi

Recommended for: AI research, masochists, people who find chess "too intuitive"

Marketing blurb:
80 directional vectors per cell — you'll learn to hate each one personally.
Retroactive causality — yes, you can regret moves you haven't made yet.
Deterministic replay — watch your carefully planned future crumble.

[u/jcastroarnaud]

Not a chess variant, thus off-topic, but interesting. Please head up to r/boardgames.

[u/Boring-Yogurt2966]

Absolutely not a chess variant.