Legal & Illegal Moves | Chess

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Hi, this is David Sullivan for Chess NYC. I want to talk about legal and illegal moves. Here we have a very basic position, mating position, each side has a king, 3 pawns, and a rook, and it’s white’s turn to move. White can bring the rook all the way down to the C8 square and say check to black, and this is checkmate. The rook is saying check to the king. The king who goes one square at a time can’t move to a place where the rook cannot still get at it. Nobody can block and nobody can capture the checking piece, but often when I’m working with young people they’re not totally clear about how pieces move, so when they give an answer like rook C8 I might say, “Well, can’t the rook just capture your rook?”

Then I wait to see who is alert and hopefully someone will notice that a rook does not move on the diagonal, so this rook is not allowed to capture that rook. That’s breaking the rules. I might say, “Well, okay if my rook can’t take my rook can’t I just bring my pawn back here like this to block the check?” Then I’m waiting for the child to notice or remember that pawns cannot more backwards so this would be another illegal move. Then last but not least I might say, “If you give me this check maybe I can bring this rook back here and block the check.” If the rook comes back and blocks the check you’re also breaking another rule. What rule is that? Rooks are not allow to jump. Perhaps I might also have thrown in, “Can’t my king take the rook?” That of course breaks another rule, kings are only allowed to move 1 square at a time. Rook to C8 is checkmate. Black cannot make any illegal moves, game over.


  1. you forgot the one where they try to take their own pawn to save the king

  2. I like theses usually but this was pointless

  3. This is hilarious 😂 True story for beginers tho.

  4. I am sure everyone will agree that this is the most unnecessary video in this fairly good series.

  5. I liked your other video about chess. This, to me, is basic knowledge.

  6. These are not legal and illegal moves 😑

  7. I've been wondering why I keep getting DQ at chess .. a rook can't go diagonal.. who would have known. Thank God I watched this expert. It's the little expert tips like this that make you Alpha when it comes to mating positions

  8. Hello sir
    Castling with two hand or one hand illegal?
    Please tell me

  9. Need a lesson on allowing opponent legal moves till you check mate them. So you don't get stalemate draw.

  10. what's with the people in the comments. this is simply a video to watch. you should care less about it being an entertainment or an educational video. this video just shows that some people out there can make messed up mistakes.

  11. Well, this vid reminds me that I once invented carrom game on chess board using pawns.. was that legal? Hahaha

  12. Another illegal move is when you use three different video angels to view the chess board ….

  13. Ahh kids mistake real chess and Harry Potter chess

  14. What brand/size/weight are the chess pieces that you use in this videos and where do I buy a set?

  15. The king should just castle the opponent's rook 😉

  16. i dont think the person knows about checkmate who doenst even know how to move rook…

  17. "Rooks are not allowed to jump." False. A rook can jump the king via castling.

  18. Why can't he just say that illegal moves are those against the rules ?

  19. Her: I only like bad boys

    Me: "Illegal chess moves"

  20. Thought this was going to be some technical rules I didn’t know of. Turns out it’s just not knowing how pieces move…

  21. What about en passent? btw, never play that move against a beginner

  22. So the only person making illegal moves is the instructor..

  23. I need to find a loop hole in these rules xD

  24. Can anyone help with a rule:


    During a Blitz game with both opponents down to a few seconds, a player says he is going to pause the clock (and does so) to find the Queen as he promotes a Pawn, but before replacing the Pawn with the Queen in hand, he realizes his king is in Check.

    A. Does he lose for pausing the clock while in Check?

    B. Does he get to take back the move as he is not allowed to make an illegal move?

    C. Does he get to take back the move, but there is some sort of penalty and his opponent gets extra time added to his clock?

    D. Something else?

  25. Wow so knowledgable thankyou for this❤❤❤

  26. I go against a beginner then he did all of the illegal moves. I pretty much annihilated him in chess.

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