App release
Published version: 1.0.0-rc57
New: Undo Chess — take-back tokens in games with a friend. When you create an invite, choose how many tokens each player gets (0–3, default 2). On your turn you can take a move back: your move and your opponent's reply are cancelled, and your token goes to your opponent. Checkmate or stalemate while you hold a token is not the end — you decide. Rules: ch960.com/undo-chess. Choosing the setup: separate numbers for White and Black, the “Random 960” and “Balanced 960²” buttons, and the balance status of what you picked. The “Main line — 15 moves” mode: the strongest lines of 850 of the 960 setups (the rest come with the next update), move by move — find the best move for White and the best reply for Black, and get an explanation and a final grade; it works offline. And classic chess pieces — the familiar shapes from Wikipedia and Lichess.
Released 2026-10-07
Size: 99.9 MB
SHA-256 of the file: fa78c4948d3ba09b88b4d45bb07c89bb1a4530695e25bbce43ad71ffb3cb2800
Google Play: coming soon. Until then the APK is installed from this site.
Earlier releases
- 1.0.0-rc53 · 2026-10-05 — Two things. The encyclopedia of balanced pairs is now ONE base under one rule — 155 pairs; the 19 admitted by the earlier one-engine rule left it, and the screen says so with the history of the composition. And a new trainer, First move: play what you think is best from any of the 960 setups and see what the best move achieves, what yours loses and where it would lead — all 960 setups were evaluated in advance, so the answer is instant and offline.
- 1.0.0-rc52 · 2026-10-04 — Pair cards now state the admission rule of their own edition: edition 1 required exactly 0.00 at three budgets, edition 2 a corridor at four budgets confirmed by two independent engines.
- 1.0.0-rc51 · 2026-10-04 — Encyclopedia edition 2 published: 122 new balanced asymmetric pairs, 174 in total across two editions. Each pair now says which edition admitted it, and each edition states its own admission rule.
- 1.0.0-rc50 · 2026-10-02 — The About screen now shows what is new in the installed version and the previous releases. The site gained a release page with the published version, its size and SHA-256 checksum.
- 1.0.0-rc49 · 2026-10-02 — Shared links to asymmetric games open correctly, spectating a pair game works, and the app no longer adds a stray second icon to the home screen.
- 1.0.0-rc48 · 2026-10-01 — Captured pieces are shown next to each player, with the material lead. Game review gained an evaluation bar beside the board.
- 1.0.0-rc47 · 2026-09-26 — Each encyclopedia pair card now says how many independent engines confirm it, and by which threshold.
- 1.0.0-rc46 · 2026-09-26 — Game review shows two numbers per move: what the move cost and where the balance stands after it.
- 1.0.0-rc45 · 2026-09-26 — Six castling drills on full starting positions, including the case where castling is legal as the very first move of the game.