Kriegspiel (chess) illegal, the player tries again; if it is legal, that move stands. Each player is given information about checks and captures. They may also ask the referee if there are any legal captures with a pawn. Since the position of the opponent's pieces is unknown, Kriegspiel is not a game with perfect information. As each player cannot see his opponent's pieces, the game is sometimes referred to as "blind chess". There are several different rule sets for Kriegspiel. The most widespread rules are those used on the Internet Chess Club, where Kriegspiel is called "Wild 16". The rules are as
Exchange (chess) rules or because the consequence of not making the exchange would be unacceptably detrimental to that player's game. Many exchanges can be offered, but they are not forced. In such cases, the player presented with the possibility of an exchange may decide to make the initial capture, may decline making the initial capture, or may even move to avoid the exchange. The player can weigh the advantages and disadvantages of each move to decide. For a prospective uneven exchange, the values of the pieces are often the deciding factor. Chess positions are often set up where a player's piece on