The most common beginner chess mistakes

50,000

Games analysed

100,000

Player-games

1–4 October 2026

Played

400–1599

Ratings (Lichess)

A mistake is a move that lowers the mover's chance of winning by 12 percentage points or more, compared with the engine's best move. Stockfish 16 judged every move at 12,000 nodes per position (about depth 9–12). Moves in games that were already decided (both evaluations beyond 9 pawns) don't count.

Ratings are Lichess ratings. They don't match Chess.com ratings, and the gap is biggest at beginner level. Every percentage on this page is per player-game: one player's side of one game, counted in that player's rating band. Games are rated games from 1–4 October 2026, at least 3-minute games (no bullet).

1. 1Hanging pieces never go away.
2. 2Nearly half of players make their first mistake by move 6 (400–799), move 8 (800–1199) and move 11 (1200–1599).
3. 3At 1200–1599, your opening barely changes how often you make mistakes, except the King's Gambit.
4. 4The Qh5 trap works under 800.

Players rated 400–799 left a piece hanging in 66% of player-games. At 800–1199 it was 59%, and at 1200–1599 still 53%: more than half. In every band, a hanging piece is the most common kind of mistake per player-game.

47% of player-games at 400–799 have their first mistake by move 6; 45% at 800–1199 by move 8; 46% at 1200–1599 by move 11. Counting only the player-games with at least one mistake, those moves are the median: half of first mistakes come by then.

Move 6

400–799 (Lichess)

Move 8

800–1199 (Lichess)

Move 11

1200–1599 (Lichess)

At 1200–1599, 25 openings have enough games to measure, and all but one land between 0.79 (Ruy Lopez) and 0.98 (Center Game) mistakes per 10 moves. The exception is the King's Gambit, at 1.10. At 800–1199 the spread is 0.92 to 1.18.

After 1.e4 e5 2.Qh5, 20% of Black players rated 400–799 answered 2...g6?? (1,024 of 5,109 player-games). It loses: 3.Qxe5+ forks the king and the rook on h8. At 800–1199 it was 6%, and at 1200–1599 it was 2%. The fix is 2...Nc6, which defends e5 first; ...g6 only works once e5 is protected.

Per 10 moves, quiet-move mistakes (moves that drop nothing outright but spoil the position) overtake hanging pieces at 1200–1599: 0.30 against 0.24. At 400–799 it is the other way round: 0.47 hanging pieces against 0.22 quiet-move mistakes. Per player-game, hanging pieces stay the most common kind in every band, including 1200–1599 (53% of player-games against 51%). Opening slips fall from 44% to 26% of player-games.

• Data: Lichess open database (CC0), standard rated games played 1–4 October 2026. Filters: both players rated 400–1599 on Lichess, no bullet (base time + 40 × increment at least 3 minutes), not abandoned, at least 10 half-moves.
• Sample: 50,000 games (100,000 player-games) between players rated 400–1599 on Lichess, played 1–4 October 2026, drawn from 3,130,191 eligible games. Games were kept by a hash of their id, so the sample is reproducible and spread across those days.
• Analysis: Stockfish 16 at a fixed 12,000 nodes per position (about depth 9–12), the first 120 half-moves of each game (average 62 analysed).
• A mistake is a move that isn't the engine's best and lowers the mover's chance of winning by 12 percentage points or more (Lichess win-percentage curve), unless the game was already decided (both evaluations beyond 9 pawns).
• Ratings are Lichess ratings. They are not Chess.com ratings and differ most at beginner level.
• A player-game is one player's side of one game, counted in that player's rating band. Nothing is shown for an opening and rating band with fewer than 500 player-games.
• The scripts are in our repository (scripts/mistake-report/), so the numbers can be reproduced.