Chess Position Trainer Manual - PDF Free Download

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Training Tactics with Chess Position Trainer - Best Combinations of 2014

Chess Opening Trainer by Propersh LLC

Lichess just added opening training (in addition to their tactics trainer). Check it out! : r/chess

Catastrophes & Tactics in the Chess Opening Workbook - Vol 1: Indian Defenses: Tactical puzzles to help exploit opportunities and avoid disasters in (Winning Quickly at Chess Workbook Series): Hansen, Carsten

I made an interactive trainer for learning the queens gambit opening, including 86 variations : r/chess

Edit Opening Chess Openings Trainer

Chess Openings Trainer

Dvoretsky: World's Best Chess Trainer - Forward Chess