Rules of Chess Kriegspiel
Each player has his own chess board with his own chess pieces placed initially in the conventional starting positions.
The players are unable to see each other's board.
A referee is able to see both boards and repeats both players' moves on his own third board,
regulating the game from his knowledge of the complete positions.
As in chess, each player moves in turn, White moving first.
The objective is to capture the opponent's king:
a warning is given by the referee that this is about to happen on the next move (the King is said to be "In Check"),
and the opponent must immediately remove himself from that position by either:
moving the King; or taking the threatening piece; or interposing another of his pieces between his King and the threatening piece.
If he is unable to do this, he has lost the game (Checkmate).
The pieces all have the same moves as in regular chess, pieces being taken by occupying the opponent's square.
However, in Kriegspiel the player making the move cannot see his opponents pieces,
and therefore is not able to tell immediately if a move is legal.
A move could be illegal because there may be an opponent's piece in the way of the move;
or the move would put the moving player in Check; or the King may be attempting to Castle across Check.
In these cases, the referee advises the player that the attempted move is illegal.
The player must then try another move (with the same piece or with another) until he discovers a legal move:
the first legal move he discovers will stand. Unlike chess, the player is not obliged to move the first piece he touches.
The referee allows all the legal moves of chess, including Castling, and Pawns taking Pawns "en-passant". Pawns become Queens on reaching the final row.
The referee will advise the players of captures and their location,
but will not advise the winning player which piece has been taken, nor the loser which piece has taken his.
In an optional rule variant, the referee differentiates Pawns lost from other Pieces lost.
Pawns take diagonally, and the referee will announce if a player has any "Pawn tries" and the location of any pieces which could be captured by a pawn.
This information is available to both players.
If his move results in the opponent being in Check both players will be advised of this,
and whether the check is on the rank (row) or file (column) or diagonal
(and if on a diagonal whether on the short or long diagonal of the checked King); check from a Knight is announced as such.
A further optional rule variant is that the referee will also annnounce Pawn promotions to Queens.
A game may be drawn (Stalemate) if a player has no legal move available to him and is not at the time in check,
however overwhelming the opposition;
or if both players are reduced to circumstances in which Checkmate becomes practically impossible
(for example each possessing only a King). An agreed draw is also possible.
If the move results in Checkmate or Stalemate, the referee will declare the game over.
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