Download the same official book in both languages. For example, get FIDE Laws in English and the Spanish translation side-by-side. This helps you learn chess terminology in both languages simultaneously.
Governmental and regional organizations often release high-quality manuals to promote the sport in schools and communities. Manual de Ajedrez (Comunidad de Madrid)
: A comprehensive guide covering history, technical rules, and computer applications in chess. : Comunidad de Madrid Virtual Library Cartilla de Ajedrez (Junta de Andalucía)
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