What to Do After an Illegal Move in a Chess Tournament

If your child thinks an illegal move has occurred in an over-the-board tournament, they should pause the clock and ask the arbiter for help before replying. Leave the pieces in place while explaining what happened. Practise that small sequence at home so asking for help feels familiar on tournament day.

Know what the arbiter needs to hear

A calm description is enough to start. Your child might say, “I think the king is still in check after that move.” They can point out the move they saw and say whether the clock was pressed. Give the other player room to explain too. Let the arbiter ask follow-up questions and direct any reconstruction.

When you rehearse, take turns playing the person who asks for help. Have an adult play the arbiter and ask “Which piece moved?” The child can practise answering in one sentence. The exercise works even before they are comfortable remembering a whole game.

What counts, and what is the penalty?

Leaving your own king in check is illegal. Under FIDE’s over-the-board rules, an illegal move is completed when the clock is pressed. The arbiter restores the relevant position, with touch-move requirements applying to the replacement.

• Standard chess adds two minutes to the opponent’s time for the first completed illegal move.

• Rapid chess uses one minute.

• Blitz under Appendix B.3 also uses one minute. Closely supervised blitz under B.2 uses the Competitive Rules and a two-minute penalty.

• A second completed illegal move by the same player loses the game, except when the opponent cannot possibly checkmate through any legal sequence. Then it is a draw.

Under rapid Appendix A.5, and blitz B.3, the timing of a claim matters. Normally it must be made before the opponent makes the next move. Ask which rules the event uses. The details appear in Articles 6.11 and 7.5 and Appendices A and B. FIDE Laws of Chess.

Ask two questions before the first round

Find the arbiter at the briefing and ask how a young player should attract their attention. Then ask which button pauses the particular clock on the table. Let your child demonstrate the action before play begins. A clock at the venue may have different controls from the one used in class.

Write down the event’s time control with your preparation notes. If you are unsure what the numbers mean, our guide to chess time controls explains the starting time and increment. Keep the arbiter’s procedure in mind when practising a game on a physical board.

Review one habit afterwards

Once the round is over, ask your child which part was confusing. Was the king’s attack hard to see? Did moving and pressing the clock feel rushed? Bring that specific moment to the coach, ideally with the position or game record if one is available.

For the next practice game, choose one action to rehearse, such as checking the king before reaching for a piece. Finish by rehearsing the request for help once more. Our beginner chess-clock guide can help with the move-and-press routine.

If your child is preparing for a first event, book a free Project64 online demo and tell the coach which tournament skills you would like to work on. A familiar practice routine gives you something concrete to discuss.