For free!
Short & Sweet: video 1/2h, 10 memorable variations to learn.
www.chessable.com/short-sweet-tschechische-verteidigung/course/252041/
Czech speaks for itself
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Jun 10, 2024
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The moment you have all been waiting for resp. everything you always wanted to know about the Czech (but were afraid to ask)
There is a high-end Chessable course available dealing with the Czech defense, re-revisited in the 21. century. Alas, in German for the time being. >600 variants, 24 hours video coverage.
Die Tschechische Verteidigung – Rattenscharf Modernisiert (chessable.com)