Concave Tech

Welcome to Concave Tech, we have over 12 years of expertise.

Product Overview

Over 600 million people worldwide know how to play chess.
Now you can learn how to play too, with Learn Chess!
Learn Chess is a short, fun, interactive e-book that teaches you the rules, terminology, essential strategies, and more.
Even if you already know the rules, it can help you improve your game.

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