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A game is not automatically declared a draw under the fifty-move rule; the draw must be claimed by the player whose turn it is to move. Therefore, a game can continue beyond a point where a draw could be claimed under the rule. When a draw under the fifty-move rule can be claimed, one of the players is usually happy to claim it. [5]
A stalemate is an automatic draw, as is a draw due to impossibility of checkmate. A draw by threefold repetition or the fifty-move rule may be claimed by one of the players with the arbiter (normally using his score sheet), and claiming it is optional. The draw by fivefold repetition or the seventy-five-move rule is mandatory by the arbiter.
The fifty-move rule was also added. At various times, the number of moves required was different, such as 24, 60, 70, or 75. For several years in the 20th century, the standard fifty moves was extended to one hundred moves for a few specific endgames (see Fifty-move rule's history).
This caused the fifty-move rule to be called into question, since many positions were discovered that were winning for one side but drawn during play because of this rule. Initially, some exceptions to the fifty-move rule were introduced, but when more extreme cases were later discovered, these exceptions were removed.
The Sofia 2005 tournament employed a similar rule, which has become known as "Sofia rules". [34] The players could not draw by agreement, but they could have draws by stalemate, threefold repetition, the fifty-move rule, and insufficient material. Other draws are only allowed if the arbiter declares it is a drawn position.
The rule of 25 vs. 4% rule. The rule of 25 is just a different way to look at another popular retirement rule, the 4% rule. It flips the equation (100/4% = 25) to emphasize a different part of the ...
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