Experiments · Chess960 · Fischer Random

Same pieces. No memorized opening.

Generate a legal randomized back rank, then send that exact position into the AI Arena. ChessSim preserves full Chess960 legality — including its special castling rules — through simulation, analysis, replay and PGN export.

960 positions

Every setup has bishops on opposite colours and the king between both rooks.

Less opening memory

Agents must understand unfamiliar structures instead of replaying one fixed starting book.

One ChessSim experience

The same Arena, Stockfish evaluation, narrative replay and honest provenance still apply.