Terms of use

Product and audience

Chess Openings by Ajedrez de Silicio is an app from Ajedrez de Silicio E.I.R.L., Peru, intended for people aged 13 and older. It includes opening puzzles organized by theme, three levels, tests, mistake review and local progress. Other products from the company are purchased separately.

Purchase and included content

The paid-download Google Play edition provides the content included in the purchased version, without subscriptions, advertising or in-app purchases. Google Play displays the price and transaction terms before purchase. No online account with us is required.

A purchase does not promise new collections or indefinite updates. Future downloads and compatibility depend on the store and published versions. Involve a responsible adult in purchases by minors where required.

For purchase issues, use Google Play support or gpacheco@ajedrezdesilicio.com. Store refund rules and applicable consumer rights apply; these terms do not limit those rights.

Training and rating

The Elo rating you enter sets your initial Silicio rating, an internal training measure. It is not equivalent to an official FIDE rating and does not provide a validated conversion of ratings from other platforms. We do not guarantee an increase in Elo or competitive results.

Only the first result of each puzzle per user changes your rating: completing it without mistakes adds points; your first mistake or viewing the solution deducts points. Repeating a puzzle does not add, deduct or restore lost points. Solving it correctly after a mistake does improve its learning status.

You choose your level when creating your profile, and it stays the same until you change it in the theme index. Your rating can rise or fall outside the suggested ranges. The timer records active practice time and does not determine points.

The catalog contains 10,453 unique puzzles across fourteen themes: 300 per theme in Intermediate and Advanced, and between 102 and 300 in High Level. These are tactical puzzles from the opening phase, organized by openings and related families. You practice concrete decisions; this is not a repertoire or a course in memorizing variations. Solutions follow the included lines and accept verified alternative immediate checkmates. If you find an error, report the theme, level and puzzle number.

Data and shared devices

Profiles, results and sessions are stored locally. This version does not synchronize or export your progress. Uninstalling the app, clearing its data or losing your device may prevent you from recovering it. You can edit and delete profiles; review the action before confirming it.

Profiles are not protected by passwords. Anyone with access to your device and the app can use or delete them. The privacy policy explains storage and support channels.

Materials and licenses

Software, graphics, sounds, original text and branding belong to their respective holders. Buying the app does not authorize reselling it or redistributing protected materials, subject to lawful uses and applicable third-party licenses.

Public-domain chess data and separately licensed components retain their status; these terms add no restrictions to them. Required software and font notices are available under View licenses.

Contact and operation

For help, privacy requests or corrections: gpacheco@ajedrezdesilicio.com. Include your device, app version and the steps needed to describe the problem, avoiding unnecessary personal information. We cannot remotely recover progress that was stored only on your phone.

This study tool may contain correctable errors. These terms do not exclude responsibilities or rights that cannot lawfully be limited.