"Seabook" wrote in message
om...
Hi guys,
Do any of you guys know actual chess games or problems where queening
a pawn to a queen instead to just a rook or a bishop gives results
worse than queening to rook or bishop?

The reason I'm asking for these is I was having a discussion about
"optimizing" a computer chess engine with an expert in the field
(Guess who that is.). I first suggested that the chess engine could
just skip over the analysis of lines where a pawn is queened to a
bishop or a rook since queening to a queen should give the same, if
not better results. Lines where the pawn is queening to a knight
should not be skipped over, of course, because its movement is not
encapsulated in that of a queen. But a few hours after I got a
response from the expert, an abstract exception popped up in my head.
That is, queening to a queen could actually be worse than queening to
just bishop or rook.

Now I need actually example game setups that can confirm my fears.

Kal
Many,many examples. If you really want to blow your mind, have a look at the
"Babson Task" articles on Tim Krabbes site,
http://www.xs4all.nl/~timkr/chess2/diary.htm where there are compositions
with different promotions from the same position..