Derek Nalls wrote on Tue, Jul 1, 2008 04:00 PM UTC:
Inconclusive Report
One type of 1:2 or 2:1 exchanges I have been playtesting using SMIRF
(versions MS-174b-O and MS-174c-O) involves a player missing 1 archbishop
OR 1 chancellor versus a player missing 1 rook and 1 bishop. Generally,
the results were favoring the Muller model in which any 1 supreme piece in
CRC (archbishop, chancellor, queen) has a material value significantly
higher than any other 2 pieces (except 2 rooks).
Embassy Chess
(player without 1 archbishop) vs. (player without 1 rook + 1 bishop)
10 minutes per move
(player without 1 rook + 1 bishop) wins 2 games (playing white & black)
75% (3/4) probability of correctness
(player without 1 chancellor) vs. (player without 1 rook + 1 bishop)
15 minutes per move
(player without 1 rook + 1 bishop) wins 2 games (playing white & black)
75% (3/4) probability of correctness
Unfortunately, since I used standard versions of SMIRF loaded with
Scharnagl CRC material values, the results became tainted due to a game
between the (player without 1 chancellor) and the (player without 1 rook +
1 bishop) at 10 minutes per move. The player with the potentially
game-winning 3:2 advantage in supreme pieces unnecessarily permitted the
exchange of its 1 archbishop for 2 minor power pieces (i.e., 1 bishop + 1
knight). Eventually, a 3-fold repetition draw occurred.
Scharnagl:
Please raise the material value of your archbishop within your CRC model?
My experience has convinced me that it is obviously 1-2 pawns too low.
Otherwise, I will be forced to abandon the use of SMIRF in favor of a
program (such as Joker80) with more reliable CRC piece values when I
return to this unresolved playtesting issue.