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Subject: Re: why the hell is Junior9 playing 18...Rae8

Author: John Merlino

Date: 12:58:11 12/17/04

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On December 17, 2004 at 12:11:38, Thorsten Czub wrote:

>[Event "World Computer Chess Championship"]
>[Site "Ramat-Gan"]
>[Date "2004.07.06"]
>[EventDate "2004.??.??"]
>[Round "3"]
>[Result "0-1"]
>[White "Diep"]
>[Black "Deep Junior"]
>[ECO "D20"]
>[WhiteElo "?"]
>[BlackElo "?"]
>[PlyCount "54"]
>
>1. d4 d5 2. c4 dxc4 3. e4 Nf6 4. e5 Nd5 5. Bxc4 Nb6 6. Bd3 Nc6 7. Be3 Nb4 8.
>Be4 f5 9. exf6 exf6 10. a3 f5 11. axb4 fxe4 12. Nc3 Be6 13. Nh3 Qd7 14. Nf4 Be7
>15. Nxe6 Qxe6 16. d5 Qg6 17. O-O O-O 18. Bc5 Rae8 19. Rxa7 Nc4 20. Qe2 Bxc5 21.
>bxc5 Ne5 22. Rxb7 Nf3+ 23. Kh1 Re5 24. Ra1 Rh5 25. h3 Qg4 26. Qf1 Ng5 27. Rxc7
>Nxh3 0-1
>
>
>
>Diep - Deep Junior
>
>[D] r4rk1/ppp1b1pp/1n4q1/2BP4/1P2p3/2N5/1P3PPP/R2Q1RK1 b - - 0 1
>
>Analysis by Junior 9 (AMD2400+, analysis mode, 160 MB hash):
>
>18...Tae8 19.Te1 Df5 20.Sxe4 Sxd5 21.f3 a6 22.Lxe7 Txe7 23.Ta5 Te5 24.Dd4
>²  (0.39)    Tiefe: 17   00:12:36  978346kN
>(, MyTown 17.12.2004)
>
>Cool. it really plays Rae8.
>All my other chess programs play e.g. Bd6.
>
>Even computing on 22.Nf3+ many chess programs do not understand anything.
>E.g. let S8 compute over Nf3 and the following position and you will see that
>this is a difficult position.
>
>Why is Junior9 giving the a-pawn ?
>And why is is not expecting white to take a7.
>Why do other programs eat a7 and do not understand the speculative attack ?

Incredible move -- very well played.

Out of curiosity, would 24.Qe3 have held for White?

CM9_R1 generally follows the game's moves after 18...Rae8. But after 23...Re5 we
have:

24.Qe3 Qg4 25.gxf3 Qh3 26.Rg1 Rh5 27.Rg2 exf3 28.Qe6+ Qxe6 29.dxe6 fxg2+ 30.Kxg2

leading to a Rook v Knight endgame which may give White drawing chances. I
didn't have time to work it through to a potential conclusion....

Thoughts?

jm





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