Observed arrival · 2026-09-07

4D Chess: Four Boards, One Game

4dchess.org Observed source

Editorial interest 88/100 Selection signal · not a rating of the site

A free online chess game played across a 4×4×2×2 hypercube, with live matches, computer play, puzzles, tournaments, and analysis.

Landing page captured for the 2026-09-07 issue.

Field notes

The game represents a 4×4×2×2 hypercube as four flat boards that can be rotated and zoomed. Its rules define movement by coordinate changes: a rook changes one axis, a bishop two by the same amount, and a knight jumps two on X or Y plus one on another axis. The visible site reports 481 puzzles, supports hourly tournaments and Glicko-2 ratings, and includes an analysis board for setting up positions.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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