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Legal moves and first-order/second-order rules

Posted By: Timothy Chow
Date: Saturday, 11 June 2016, at 12:14 a.m.

In Response To: Legal moves and first-order/second-order rules (Bob Koca)

Though I would lean towards calling it a first-order rule, the reason I consider it to be a borderline case is that it governs a situation that comes up relatively rarely. Thus it is quite possible to play the game, not just once but many times, without ever being aware of the rule.

I believe it was Korchnoi who once asked an arbiter in a top-level tournament game whether it was legal to castle with a rook that was under attack. You would probably categorize this as a first-order rule but it is certainly possible to play chess at a world championship level without ever being clear on this point.

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