Author: Peter McKenzie
Date: 13:54:14 06/29/99
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On June 29, 1999 at 09:44:23, John R. Menke, Sr. wrote: >----------------------------------------------------------------------------- > >In March 1999 Chess Life magazine, IM Larry Kaufman presented his research into >the relative material values of the chess pieces based upon statistical research >using a database of nearly 300,000 games where both players had FIDE ratings of >at least 2300. His summarized values were as follows: >Pawn = 1 >Bishop Pair = +1/2 I though he said the bishop pair was worth +1/4, could you please check this? >Bishop = 3 1/4 >Knight = 3 1/4 >Rook = 5 >Queen = 9 3/4 >He says these values agree with the statistics within about 1/8 pawn accuracy in >nearly every case tested. He also suggested a possible slight bias in favor of >the Queen, which could be valued at 9 1/2 instead. I'm curious if these values >have been tested with chess playing computer software vs different values? > >With Chessmaster 6000 I have come up with the following approximation which I'm >testing, and have dubbed it the "Kaufman-Menke" values: >Pawn = 1 >Bishop = 3.3 >Knight = 3.2 >Rook = 5 >Queen = 9.7 > >In comparison I believe that Terry Ripple is using the following values (dubbed >"CM6555") for his tests with CM6000: >Pawn = 1 >Bishop = 3.5 >Knight = 3.3 >Rook = 5.5 >Queen = 10 > >And I understand that Shep's values are as follows: >Pawn = 1.1 >Bishop = 3.5 >Knight = 3.3 >Rook = 5.5 >Queen = 10 > >In a related note, I recently encountered the following interesting position >which I believe might be a useful benchmark position in some of these tests >regarding the relative values of Bishop and Knight. Slight changes in their >material values will determine the subsequent course of the game. In one case >the Bishop will be exchanged for Knight, or it will be retreated because it is >slightly more valued. The position arises after the following moves: > >1 d4 Nf6, 2 Nf3 d5, 3 e3 e6, 4 Bd3 c5, 5 c3 Nc6, 6 Nbd2 Bd6, 7 0-0 0-0, 8 Re1 >e5, 9 dxe5 Nxe5, 10 Nxe5 Bxe5, 11 Nf3 Bg4, 12 Be2 ... > >The question is: Should black play 12...Bxf3 or retreat the bishop to d6 or c7? > A slight change in the relative material values of the Bishop and Knight causes >Chessmaster 6000 to make different decisions here. > >All comments welcome... > >John Menke > >-----------------------------------------------------------------------------
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