Help and support

Chess: Memory & Vision · Updated: September 30, 2026.

Blindfold chess

Choose a side, one of four levels and a visibility mode. Drag from the starting square to the destination. Play with pieces, circles or hidden pieces. Peek at board reveals the position and records a hint. Move list shows paired White and Black notation. Your game is saved on this device.

Remember openings

Choose a line, study its moves and idea, then rehearse both sides. Use pieces, circles or blindfold mode. A green mark means completion without errors or hints; yellow encourages another attempt. The full catalog offers additional variations beyond the 60 essential lines.

Invisible board

Study an opening position, hide the pieces and reconstruct it by dragging from the tray and within the board. Check the result and try again. Positions retain a real chess context.

Save, restore or delete progress

In Settings, Save backup exports your information. Restore backup loads a compatible JSON copy after confirmation. Backups are not synchronized automatically. To erase all private app data, use Android storage settings or uninstall the app. Delete exported copies separately. A purchase or reinstallation does not restore progress without a backup.

Compatibility and accessibility

Android 8.0 or later; WebView 109 or later. If a compatibility notice appears, update Android System WebView or Chrome from Google Play, then reopen the app. Settings includes language, sound, coordinates, study orientation and reduced motion. Portrait and landscape are supported, and text follows Android’s font-size setting.

Support, refunds and complaints

AJEDREZ DE SILICIO E.I.R.L. · RUC 20609915529. Calle Manco II 140, Edificio Valente 1, Departamento 103, San Miguel, Lima, Perú. gpacheco@ajedrezdesilicio.com. Include the product, version, device model and what happened. Do not send passwords or card information. Minors should ask an adult for help. See Google Play refunds or our Complaints Book (Libro de Reclamaciones).

Licenses and engine source

Settings → Legal documents contains the notices and licenses. Save engine source code exports the corresponding Stockfish 19 Smallnet sources, neural network and build instructions. It works offline.