Add Yahoo as a preferred source to see more of our stories on Google. If you already know how each piece moves, then you'll play against Duolingo's character Oscar in mini-puzzles, wherein you'll have ...

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The following content is brought to you by Mashable partners. If you buy a product featured here, we may earn an affiliate commission or other compensation. The Ultimate Beginner to Grandmaster Chess ...

Thousands of new people are delving into the sport of chess on a daily basis now and trying their hand at learning the many principles and theories that have been developed and fine-tuned since chess ...