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Here are the legitimate and grey-area sources:
Import your PGN into , Lichess , or ChessTempo . Laszlo Polgar Chess Middlegames Pgn
Don’t shuffle 2,000 positions. Open the PGN in Scid vs. PC or Lichess’s study feature. Pick one tag (e.g., “Back Rank Mate”) and solve 10-15 positions a day until the pattern is automatic. Here are the legitimate and grey-area sources: Import
Each of the 77 chapters typically contains 54 problems. or ChessTempo . Don’t shuffle 2