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Subject: Re: Maximum Number of Legal Moves

Author: Vincent Diepeveen

Date: 07:55:52 05/09/05

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On May 08, 2005 at 23:44:31, Andrew Shapira wrote:

>What's best known (the smallest) upper bound on the number of legal moves, taken
>over all chess positions?  An obvious bound is 9*7*4+2*14+2*14+2*8+8 = 332.
>This comes from 9 queens, 2 rooks, 2 bishops, 2 knights, and 1 king.  Is a
>better bound known?

220 moves is theoretic maximum. I managed myself to not construct a position
with more than 216 moves, a year or 12 ago, a few years later when i tried once
i came to 218 moves.

In Diep for safety reasons i assume 220 to be the maximum.

No one will manage ever to construct obviously a position with more than 220
legal moves :)

Instead of asking the maximum number of legal moves, you should be more
concerned however with the number of semi-legal moves as they can happen in your
engine. As we already know the maximum number of moves are in positions with a
king in the corner, Obviously the theoretic limit for that is 225 moves.

Vincent



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