Chessexplained’s Benko Repertoire: A complete answer to 1.d4: https://www.chessable.com/opening-book/chessexplaineds-benko-repertoire-a-complete-answer-to-1d4/3258/ For sale for $9.99 USD
IM Christof Sielecki’s channel: https://www.youtube.com/user/Chessexplained
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