Play against a text.

No engine, no opening book, no evaluation function. It read the forty sentences of rules below, and nine principles from 1749. Edit any of them and it changes how it plays, immediately.

THE RULES OF CHESS IT READ — EDIT THEM
Delete the sentence that says how the bishop moves, hit Reread rules, and the bishop stops moving.
THE NINE PRINCIPLES — EDIT THEM
Change a line, then Recompile. Nothing is cached: it re-reads the text.
WHAT IT COMPILED FROM THEM
WHY IT PLAYED THAT MOVE
Move a white piece.

No LLM · no gradient · no search · one ply, on a CPU. AlphaZero learned the same value from 108 self-played games and cannot tell you why.