ChessX is an Open Source chess database - new version 1.1.0

The Ultimate Guide to Chess Openings

OpeningMaster

Build your Chess Database –

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All 1d6 Opening Repertoire Collection (6 Digital DVDs)

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Opening Tree Which chess app?

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The most common opening in master games (according to chess.com's database) is surprisingly the Open Sicilian, with e4 c6 being almost 3x more popular than e4 e5. : r/chess