Opening Puzzles turns chess mistakes into targets

Field notes

The trainer organizes practice around three levels: one-move material wins, two- or three-move forcing lines, and longer quiet punishments aimed at club-level players. Its source material is described as opening mistakes from rated Lichess games, with Stockfish verification, and the interface supports side, difficulty, random, and opening filters. A visible five-puzzle daily goal adds a lightweight practice loop, while the page says its collection is expanded monthly.