For example, if we want to encrypt the message ‘hi’ with the Polybius Square found above we can do this as follows. In order to encrypt a message, each letter is replaced by its coordinates, row and column, according to the Polybius Square. This move is written down as o-o.Ī Polybius Square uses a 5×5 grid filled with all letters of the alphabet for encryption. Castling consists of moving the king two squares towards a rook on the player’s first rank and then moving the rook to the square that the king crossed. behind the specific move if en passant is performed. En passant is a special rule that allows pawns to capture pawns on adjacent tiles under special circumstances and is denoted with e.p. In chess, there are two special moves, en passant and castling. Notice that this move can also be performed by the other rook, therefore, the ‘a’ is added to the notation. Then Rad8 means that the rook in column a is moving to square d8. One rook is on a8 and the other rook is on h8. For example, assume the back-rank is empty except for two rooks. If this is the case, the starting column of the piece that makes the move is also stated in the notation. In exceptional cases, it is possible that a move can be made by multiple pieces. For example, Qe7#, means that the queen is moved to square e7 and the opponent’s king is in checkmate and therefore queen to e7 is a winning move. Lastly, if the move causes the opponent’s king to be in checkmate a ‘#’ is added to the notation. For instance, Nd2+ means that the knight is moved to square d2 and the opponent’s king is in check. Furthermore, if the move causes a check on the opponent’s king a ‘+’ is added to the notation. For example, Bxc3, which means that the bishop has captured an opponent’s piece at square c3. In addition, if there is already a piece on that specific square an ‘x’ is added to the notation, which means that in that move a piece of the opponent has been captured. If we have the move Re1, this means that the Rook is moved to the square in column e and row 1. To see to which square the piece is moving, the rows and columns of the board are assigned a name from 1 till 8 and a till h respectively. For the King this letter is a K, Queen a Q, Rook an R, Knight an N, and for the Bishop a B. In order to distinguish which piece has been moved, a letter is assigned to each piece except for the pawn. In chess, we have a total of six different chess pieces: King, Queen, Rook, Knight, Bishop, and a Pawn. To decipher the chess game, you need to know a bit about chess notation. The explanation of this cipher can be found below or at /ciphers/polybius-square-cipher/. Secondly, the chess notation can either be found below or at /article/view/chess-notation. First of all, the basic rules of chess can be found at /learn-how-to-play-chess. To give you a head start, a few things should be known in order to solve this chess puzzle. Can you figure out what sentence is hidden within this chess game and find out what the two players were trying to communicate to each other? Repeating this process for all the moves creates a sentence. A letter combination can be translated to a different letter with the use of a Polybius Square found below. If you look even closer you notice how to decipher the message, at each turn you have a combination of two letters that had to be filled in at the question marks. It seems like there is a hidden message within the game. At first, their moves look very normal, but the moves get stranger by the minute. On the right, you can find the end positions of the chess game.Īfter figuring out the whole chess game you smell something fishy about it. Fortunately, all pawn moves are given and therefore known. All moves that contain a question mark are moves that are incomplete and need a Q, K, R, N, or B on the spot of the question mark. On the left, you find all the moves that have been written down by both players, where Stockfish is white and AlphaZero is black. Luckily for you, there is only one possible game for the moves that have been written down and thus the game can be recreated. Sadly, the game you just watched has not been written down correctly and almost all the moves done by a King (K), Queen (Q), Rook (R), Knight (N), and Bishop (B) are unknown. However, you notice that something does not add up and you try to analyze the game that just had been played. After a total of forty moves played by both, Stockfish is able to beat AlphaZero with a checkmate. On a Friday afternoon, Stockfish and AlphaZero are playing chess.
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