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Topic: Bare Kings situation
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OnceuponEngland flag

I am still working on improving my game...


Yeah, by rewriting the rules :-P

EvjenUnited States flag

Article 5 of the FIDE Laws of Chess details the ways a game may end in a draw, and they are detailed in Article 9: (Schiller 2003:26-29).

* Stalemate - if the player on turn has no legal move but is not in check, this is stalemate and the game is a draw.
* Threefold repetition - if an identical position has occurred three times, or will occur after the player on turn makes his move, the player on move may claim a draw (to the arbiter). In such a case the draw is not automatic - a player must claim it. Article 9.2 states that a position is considered identical to another if the same player is on move, the same types of pieces of the same colors occupy the same squares, and the same moves are available to each player; in particular, each player has the same castling and en passant capturing rights. (A player may lose his right to castle; and an en passant capture is available only at the first opportunity.)
* Fifty move rule - if at least fifty moves (by each side) have passed with no pawn being moved and no capture being made, a draw may be claimed by either player. Here again, the draw is not automatic and rather must be claimed.


Draw. No sequence of legal moves can lead to checkmate. (Mednis 1990:43)

* Impossibility of checkmate - if a position arises in which neither player could possibly give checkmate by a series of legal moves, the game is a draw. This is usually because there is insufficient material left, but it is possible in other positions too (see the diagram). Combinations with insufficient material to checkmate are:

* king versus king
* king and bishop versus king
* king and knight versus king
* king and bishop versus king and bishop with the bishops on the same color. (Any number of additional bishops of either color on the same color of square due to underpromotion do not affect the situation.)

* Mutual agreement - a player may offer a draw to his opponent at any stage of a game, ostensibly with the understanding that a draw by any other means has become inevitable anyway. If the opponent accepts, the game is a draw.

It is popularly considered that perpetual check – where one player gives a series of checks from which the other player cannot escape – is a draw, but in fact there is no longer a specific rule for this in the laws of chess, because any perpetual check situation will eventually be claimable as a draw under the fifty move rule or by threefold repetition, or (more likely) by agreement (Hooper & Whyld 1992).

It should be noted that although these are the laws as laid down by FIDE and, as such, are used at almost all top-level tournaments, at lower levels different rules may operate, particularly with regard to rapid play finish provisions.


Flip

Draw. No sequence of legal moves can lead to checkmate. (Mednis 1990:43)

http://en.wikipedia.org/wiki/Draw_%28chess%29

It would be nice if Queen Alice enforced the above drawing rules, but I am not sure how much programming would be necessary to accomplish this.

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