Author: Robert Hyatt
Date: 18:36:39 08/10/99
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On August 10, 1999 at 21:07:53, Alex Boby wrote: >On August 10, 1999 at 19:56:10, Marc Plum wrote: > >>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 > > I think it probably just random. Since either of the 4 moves will result in >exactly the same position and thus exactly the same eval,.. it's probably just a >matter of what order they're generated in or sorted in. See my previous post. the type of promotion can affect the search depth.
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