Chess is basically "capture the king", ie the checkmate rules are consistent in the sense that
they are just the "1-move closure" of the "whoever captures the king first, wins" rule.
The stalemate rule is the exceptional one in my opinion, because it says that a king
not in check but with no move available (including other pieces) is a drawn position.  It really
should be a win for the stalemater, but this would throw out years of interesting endgame
theory, particularly the "opposition" theory, which is nice
 
So in Dan's example, the pinned piece moves to capture the king, exposing his own
king yes, but then, the game is over so that doesn't matter
 
 
Thane Plambeck
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650 323 4928 fax
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----- Original Message -----
From: asimovd@aol.com
To: math-fun@mailman.xmission.com
Sent: Tuesday, May 06, 2003 1:09 PM
Subject: [math-fun] A proposed new chess rule

I don't think this comes up often in practice, but unless I'm mistaken one's king may not be on a square that is attacked by any of the opponent's pieces.

AFAIK, this even includes the situation when the said opponent's piece is immobilized due to its being pinned against its own king.

Thus a checkmate could occur even when the checkmate hinges on a king's being forbidden to escape to a square "attacked" by an opponent's piece that is at the time  immobilized by a king pin.

Is this correct?  It won't change the course of chess very much, but if this is possible I think the rule should be changed so that the king is allowed to move to any unoccupied square unless the opponent could conceivably "take" the king on that square on the very next move.

Comments?

--Dan


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