Author: Mark Young
Date: 16:51:10 05/23/99
Go up one level in this thread
On May 23, 1999 at 19:34:17, Dave Gomboc wrote:
>On May 23, 1999 at 18:41:59, Mark Young wrote:
>
>>After looking over the Rebel 10.5 - GM Rohde game with many programs, I finally
>>got around to why Hiarcs 7 wants to play 23. Rxb4 instead of the move 23. exd4
>>as was played in the game and most other program agree with, giving it a equal
>>score or slightly minus score, but all the other programs think 24.Rxb4 is a
>>mistake. (Hiarcs7 give 23. Rxb4 a +138, or better then a pawn advantage at +128)
>>
>>In a effort to see why Hiarcs7 is making this blunder, I played the other
>>programs against Hiarcs7 after the move 23. Rxb4. To my surprise all of them
>>have lost even though they think 23. Rxb4 is far from the best move and prefer
>>23. exd4.
>>
>>If 23. Rxb4 is losing what is the winning line against this move 23. Rxb4 that
>>none of the program I have tried can find.
>>
>>
>>Here is an example of what I am seeing against other programs. Played at 40
>>moves in 2 hours. This was Fritz try to bust Hiarcs 7 23. Rxb4.
>>
>>
>>[Event ""]
>>[Site ""]
>>[Date "1999.04.23"]
>>[Round ""]
>>[White "HIARCS 7"]
>>[Black "Fritz 5"]
>>[Result "*"]
>>[FEN "1r1qr2k/1p4pp/3p4/1R1B1p2/1pPp4/4P1Pb/1P3P1P/Q3R1K1 w - -"]
>>
>>{H701: 65472Kb, <3000589b>}
>>23. Rxb4 {H7: 10 23.Rxb4 h6 = 138}
>>23... dxe3 24. Rxe3 {H7: 11 24.Rxe3 Rxe3 fxe3 b6 Qa7 Bg4 Rb5 Qe8 Kg2 Bh3+
>>Kf2 Qd8 = 140}
>>24... Rxe3 25. fxe3 {H7: 11 25.fxe3 b6 = 140}
>>25... Qe8 26. Kf2 {H7: 11 26.Kf2 b6 Qa7 Qd8 Be6 Bg4 = 172}
>>26... Qc8 27. Rb6 {H7: 10 27.Rb6 Ra8 Qd1 Rb8 Qb3 Qf8 Rxb7 Rd8 Rf7 Qe8 Qb7
>>Qe5 = 280}
>>27... Qd8 28. Rxb7 {H7: 11 28.Rxb7 Rxb7 Bxb7 Kg8 Qa8 Qxa8 Bxa8 Kf7 b4 Ke7 b5
>>Kd8 b6 Kc8 Bd5 = 325}
>>28... Rxb7 29. Bxb7 {H7: 12 29.Bxb7 Kg8 Qa8 Qxa8 Bxa8 Kf7 b4 Ke7 Bg2 Bg4 b5
>>Kd8 b6 Kc8 e4 Kb8 exf5 Bxf5 = 344} and white gos on to win.
>
>
>Crafty gives Rxb4 a plus score... but at least on early iterations, a slightly
>less plus score that exd4. After a continuation like
>
>23. Rxb4 h6 24. b3 dxe3 25. Rxe3 Rxe3 26. fxe3 Bg4 27. Kg2 Kh7 White looks
>pretty good. Of course, just about all of those moves might be suboptimal. :-)
>
>Dave
Junior 5 also now likes 23. Rxb4 after a long think. It will be interesting to
know if this move 23. Rxb4 is winning. So far it looks very strong...more
checking needed.
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