Play the Chess Computer Interface

Welcome to the chess playing interface! Here you can play games against a variety of computer opponents, or you can also use a "self-play" mode.

How to Start? Navigate to the level or puzzle that you want to do. Once the chess board is displayed, you can simply make your first move. It is already waiting for you move when it loads up.

How to Quit a Level? You can go back to the index of the levels by clicking the "Chess Levels" button at the top, or the "All Levels" link below the chess board. Or you can simply use the "Home" button. Alternatively, you can click on the "Next Level" button to skip onto the next level or puzzle.

Moving the Chess Pieces

How do you move a piece? On a desktop computer you use the mouse to click, and on a Phone or Touchscreen you can Tap with your finger. To move a piece, you click or tap twice. First, click or Tap on the Piece you want to move. Then Click or Tap a second time on the new square where you want to move it to.

How does the computer move? If you are on a normal level versus the computer, the computer will automatically play its move after you make your move. You don't have to click or tap to get the opponent to move. (Unless you are in "self-play mode", see below.)

Highlighted squares: The computer shows highlighted squares for the legal moves for a piece. This tries to help you learn which moves are legal for each piece.

How do you capture? To capture, you first click on your piece that you want to move, and then with the second Click or Tap, you Click or Tap on the opponent's piece that you want to take.


There are a number of buttons and features of the display:

  • Replay: This will re-start the entire game or puzzle level from the beginning. The board will reset to the starting position. It will then be waiting for your first move.
  • Undo: (Take-Back) This will undo or "take back" a move. It will then be waiting for your next move. In the vs-computer mode, it will take back the computer's move and your move. In self-play mode, it will take back only a single player's move. You can Undo multiple times, all the way back to the original starting position.
  • Solve: This will show an example solution, moving the pieces on the chess board, slowly, one move at a time. At the end, it will pause, ad then it will reset to the prior position once finished. Not all levels or puzzles have a Solve button.
  • Next Level: This will move on to a new game or puzzle level.
  • Tutorial: This will take you to a longer tutorial in English that explains about the rules of chess and how to improve your playing ability.
  • Hint: This will display an English hint explaining what you might want to do. Not all levels or puzzles have a Hint button.
  • All Levels: The All Levels link will take you back to the index of all of the chess levels.
  • Chess Help: The Chess Help link will take you to the Tutorial text, the same as the Tutorial button.


Computer Opponent is Not Making a Move: If the computer is not moving, it may have already have made a move. Sometimes it moves fast and its move is not obvious. Try to see if you can make a move yourself? Or check the move list to see what the last move was. Or you might be in "self-play" mode rather than a computer opponent level.

It Won't Allow My Move: Is it showing a red square where you try to move? That means that the computer doesn't think you can legally move your piece to that square? Maybe that's an illegal move? Are you sure that the piece can legally move to that square? Look in the messages area to see if the computer is telling you why it's disallowed that move. Or perhaps your King is in check? Or are you trying to move one on your opponent's pieces instead of your own?

Making Advanced Chess Moves

How do you castle? You castle by moving the King two squares. You don't move the Rook (it is moved automatically). So you castle by first clicking or tapping on the King piece, and then click or tap on the empty square, the one that is 2-squares to the left or right of the King (towards the Rook). If it's still not allowing that castling move, you might want to review the rules of castling. For example, all the squares must be empty, you cannot castle 1-square or 3-squares, you cannot castle out of check, through check, or into check, and you cannot castle if either the King or Rook has previously moved. Review Castling Move Basics and also the Advanced Castling Rules.

How to Promote to a Queen?: Simply move the pawn up to the last row. It will automatically be converted to a Queen. If this move isn't being allowed, maybe it's an illegal move, or maybe your King is in check or some other problem.

How to do En Passant Pawn Captures?: You click or tap on the pawn your a moving, and then click or tap on the empty square to which it would move. You don't click or tap on the enemy pawn for an en passant capture, but you do for a normal pawn capture. Review the rules of en passant if it's not allowing you to capture using en passant. Review the En Passant Pawn Capture Rules.

Self-Play Mode

The self-play mode is a chess board where you move both players, White and Black. There is not a computer opponent. This self-play mode can be used to play against another human sitting next to you. Just take it in turns making the moves.

Limitations of the Interface

No online play: This is not an online chess server. You cannot play against other human opponents remotely.

Drag and Drop? No, sorry, you cannot "drag-and-drop" the piece you want to move on this interface.

No under-promotion: Currently the interface does not allow promotion to any piece other than a Queen.

Triple-repetition draws: Currently there is no detection of draws by triple move repetition.

50-move rule draws: Currently there is no detection of draws by the 50-move rule.