Half a croissant, on a plate, with a sign in front of it saying '50c'
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2.5D Chess Board

A chess board physically manifests all the available moves
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Chess programs can routinely display all the available moves for a piece.

This idea is about constructing a physical chess board that is able to do the same, perhaps using magnets or physical levers to raise and lower sections of the board, so that when a piece is selected, an actual set of channels is created demonstrating possible moves. Ramps maybe needed for knight moves.

theircompetitor, Nov 01 2011

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       Would multiple boards + robotic arm + software be considered cheating?
mouseposture, Nov 01 2011
  

       The board could be underlit; the destination spaces of each possible move would light up in sequence.
Alterother, Nov 02 2011
  

       I like it, pulsing lights
theircompetitor, Nov 05 2011
  
      
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