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Opening principles

Logic Level 1

In the following position, which of the four given moves is strongest for White?

a3 Bc4 Qe2 c4

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations,
examples, and problems from the community.

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including olympiad champions, researchers, and professionals.

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by Alexander Katz

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