Tactics
The Blunder Check
Most games below master level are not decided by deep strategy or brilliant combinations. They are decided by blunders: a piece left undefended, a mate in one overlooked, a capture that walks into a tactic. The good news is that blunders are the easiest weakness to fix. You do not need more talent or more opening theory, only a short routine that you run before every move until it becomes automatic.
What a blunder really is
A blunder is a move that throws away a significant amount of material or the game itself, usually because the player missed something simple. The word "simple" matters. Most blunders are not failures to see a ten-move combination. They are failures to look at all: the player was absorbed in their own plan and never asked what the opponent could do next.
That is why a checklist works. It forces you to look at the board from the opponent's side before you commit.
Hanging pieces
A hanging piece is one that is attacked and not adequately defended. The most common hanging pieces are:
- A piece that was defended until you moved its defender somewhere else.
- A piece attacked by a cheaper piece. A knight defended by a pawn is still lost if a pawn attacks it.
- A piece attacked twice and defended once.
- A piece that only looks defended, because the defender is pinned or overloaded.
Before every move, look at the square your piece is going to. Is it attacked? By what? Is it defended enough? Then look at the square your piece is leaving. What was it defending, and is that still safe?
The pre-move checklist
Here is a short routine that catches the large majority of blunders. With practice it takes only a few seconds.
- What did my opponent's last move do? Ask what it attacks, what it defends, and what lines it opened. Many blunders happen because a player ignores the opponent's move and continues with their own plan.
- What are my opponent's checks, captures and threats right now? If you ignore them, which of them hurts?
- Pick your candidate move.
- After my move, what are my opponent's checks, captures and threats? Imagine your move played, then look at the board as your opponent would. This is the step that prevents most blunders.
- Is anything of mine left hanging? Count attackers and defenders on any piece that is attacked.
Step four is the heart of the routine. The question is not "is my move good?" but "what is my opponent's best reply?". If that reply is a check, a capture or a mate, look at it properly before you let go of the piece.
Common beginner blunders
Ignoring the threat to f7 or f2
Early in the game, the f7 square (f2 for White) is defended only by the king. That makes it the target of the Scholar's Mate, which catches many new players.
In this position, White's queen and bishop both attack f7, and the only defender is the king. The natural developing move 3...Nf6?? attacks the queen but does nothing about the threat, and 4.Qxf7# is checkmate. Black has several good replies: 3...g6 attacks the queen, 3...Qe7 and 3...Qf6 both defend f7. After 3...g6 4.Qf3, the threat to f7 is renewed, and Black can answer with 4...Nf6. Notice that the blunder came from answering the wrong question: Black asked "how can I develop with tempo?" instead of "what is White threatening?".
Play through the Scholar's Mate →
Weakening the king for no reason
The shortest possible checkmate, the Fool's Mate, comes from two king-weakening pawn moves: 1.f3 e5 2.g4?? Qh4#. Moving the f- and g-pawns early opens the diagonal from h4 to e1. It is an extreme case, but the lesson applies in every game: pawn moves in front of your king cannot be taken back.
Play through the Fool's Mate →
Grabbing material without checking the back rank
Captures feel safe because they win something. That is exactly why they are dangerous. Before taking a pawn, ask what the capturing piece was doing on its old square.
Here White's queen on a4 is quietly guarding d1 along the diagonal. The pawn on a7 looks free, but after 1.Qxa7?? Black plays 1...Rd1#, because White's own pawns on f2, g2 and h2 trap the king on the back rank. The queen was doing an important defensive job, and the capture removed it. Step four of the checklist catches this immediately: after 1.Qxa7, Black's checks include ...Rd1, and it is mate.
Moving the wrong piece after a trade
In capture sequences, players often recapture automatically with the nearest piece. Pause and ask which recapture keeps your pieces defended and your king safe. Sometimes the opponent has an in-between move, such as a check, before recapturing, and the whole exchange looks different.
Habits for time trouble
Blunders multiply when the clock is low. You cannot run the full checklist with ten seconds left, so use a shorter version and a few practical rules:
- Manage the clock early. The best cure for time-trouble blunders is not reaching time trouble. Avoid spending a quarter of your time on a single opening move you should know.
- Use the shortened checklist. With little time, ask only: "Does my move hang a piece, and does it allow a check?"
- Keep pieces defended. In time pressure, prefer moves that keep your pieces protected and your king covered, even if they are slightly passive.
- Do not play on increment reflex. In games with an increment, take one or two seconds for a safety glance even when you could move instantly.
- Avoid unnecessary complications. If you are winning and short of time, choose the simple move over the brilliant one.
Our guide to time controls and clocks explains increments and delay in more detail.
How to practise this
- Play slower games against the computer on our play page and say the checklist to yourself on every move for a full game. It feels slow at first, then becomes natural.
- After each game, find your biggest mistake on the analysis board and identify which checklist question would have caught it.
- Solve tactics on the puzzles page. Every puzzle you solve is a blunder someone else made, so they train you to recognize the patterns from both sides.
- Read how to calculate to extend the checklist into full calculation for critical positions.