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Subject: Meaningless Underpromotions

Author: Marc Plum

Date: 16:56:10 08/10/99


A while back I ran some multiple engine tournaments within the Nimzo99
interface.  One thing that I noticed was that some  programs would make
meaningless underpromotions.  That is, in a position where a promoted pawn would
be immediately exchanged anyway, the computer might promote to a bishop or rook
rather than a queen.  I had occasionally encountered the same thing in my own
games with computers; I also found a small number of computer games like this
when doing a database search for underpromotions.  I don't have any statistics
to present; I'm just noting that this happens not infrequently.

When a human player does this, he is probably just being whimsical, or it could
be a psychological ploy.  I wonder, though, why a computer would do it.  Is it
just a random thing?  Does the computer reason that losing a bishop is less bad
than losing a queen, even though the resulting position is the same? Or do
computers like messing with people's minds too?

Marc Plum



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