In a real game, you do not have infinite time to find a tactic. Give yourself a strict limit of 2 to 3 minutes per position. If you cannot find the definitive solution in that window, make your best guess and move the piece in your PGN viewer to reveal the answer. Step 2: Calculate to the Very End
: Using the PGN files with software allows for "Spaced Repetition," a scientific method where players re-solve puzzles they missed until the patterns are permanently etched in their memory. Finding and Using the PGNs
: The official publisher offers the book on their website.