Author: Sarah Bird
Date: 15:27:25 06/30/99
Go up one level in this thread
On June 30, 1999 at 18:03:14, Chuck wrote:
>rn3rk1/pp2ppbp/6p1/8/3PP1b1/5N2/q2BBPPP/1R1Q1RK1 w - - 0 1
>
>I had Hiarcs 7.32 search the above position for several hours to a depth of 11
>ply, and it wants to play Rxb7 scoring this +0.69. However, in looking at Fritz'
>opening book, the move is not mentioned, only Bg5, Be3, and d5.
>
>This position arises from the Grunfeld Exchange, D85 as follows:
>
>1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7
>7. Nf3 c5 8. Rb1 O-O 9. Be2 cxd4 10. cxd4 Qa5+ 11. Bd2 Qxa2 12. O-O Bg4
>
>I searched the 2 million games opening database and found six occurrences with
>no names that I recognized. In the six games, White drew 3 and lost 3 (1.5-4.5),
>so that indicates the pawn should be left alone.
>
>But this brings up my point? Is Hiarcs heading for trouble? Is the pawn
>poisoned, but in such a deep line that computers can't see it in reasonable
>time? And will all computers make this mistake, if it is one?
>
>I'm interested in what other computers and other people have to say about this
>position. How about it?
>
>Chuck
Fritz 5.32 when taken off book choice also likes Rxb7 Hiarcs book lists a total
of 4096 games where this is played. It lists the following moves as being best
after 13 Rxb7......Bxf3
14 Bxf3......Bxd4
15 e5........Na6
16 Rxe7......Rad8
17 Qe2.......Rde8
18 Rd7 at this point Hiarcs considers white ahead by 0.62.
Fritz after 13 Rxb7 don't disagree much with the moves played as best by Hiarcs
book but after 18 Rd7 thinks that Rxe5 leaves black slightly ahead. Not sure why
the move isn't in Fritz book the move seems ok.
Sarah.
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