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Subject: Re: How many programs avoid 29. Rf6?

Author: Andrew Dados

Date: 18:42:29 07/06/00

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On July 06, 2000 at 21:35:44, Dann Corbit wrote:

>On July 06, 2000 at 20:34:43, Victor Valenzia wrote:
>
>>This game between Fritz 6a and Chessmaster 5000 was fairly even until 29. Rf6?
>>Fritz then played 29. Ne4, setting up a knight exchange, leading to a
>>devastating passed pawn on the e-file for Fritz.  I don't own CM6000 or CM7000,
>>so I would be curious to know if these programs would have avoided 29. Rf6?
>>
>>[D]2kqr3/pp6/2pn2pp/3p4/3P4/PP3RN1/2P2QPP/6K1 w - - 0 1
>
>It takes 11 minutes on my computer to find Re3, which is still down half a pawn.

I assume 'It' means crafty, correct?

> On Dr. Hyatt's machine it would find that move at tournament time control of
>40/2, I am sure.  But I am not at all sure that move is much better.
>
>What do you think is the righrt alternative?
>
>PFGA: EPD record: 1
>              time surplus   0.00  time limit 16:39 (16:39)
>         nss  depth   time  score   variation (1)
>               11    14.59  -0.17   1. Rf6 Ne4 2. Nxe4 dxe4 3. Rxg6 e3
>                                    4. Qf5+ Kb8 5. Re6 Rxe6 6. Qxe6 Qxd4
>                                    7. Qg8+ Kc7 8. Qh7+ Kb6 9. Qxh6
>               11->  19.64  -0.17   1. Rf6 Ne4 2. Nxe4 dxe4 3. Rxg6 e3
>                                    4. Qf5+ Kb8 5. Re6 Rxe6 6. Qxe6 Qxd4
>                                    7. Qg8+ Kc7 8. Qh7+ Kb6 9. Qxh6
>               12    44.91  -0.17   1. Rf6 Ne4 2. Nxe4 dxe4 3. Rxg6 e3
>                                    4. Qf5+ Kb8 5. Re6 Rxe6 6. Qxe6 Qxd4
>                                    7. Qg8+ Kc7 8. Qh7+ Kb6 9. Qxh6
>               12->  59.09  -0.17   1. Rf6 Ne4 2. Nxe4 dxe4 3. Rxg6 e3
>                                    4. Qf5+ Kb8 5. Re6 Rxe6 6. Qxe6 Qxd4
>                                    7. Qg8+ Kc7 8. Qh7+ Kb6 9. Qxh6
>               13     1:16     --   1. Rf6
>               13     3:26  -0.61   1. Rf6 Ne4 2. Nxe4 dxe4 3. Rf4 e3 4.
>                                    Qe2 Qd6 5. Qg4+ Kd8 6. Re4 Rxe4 7.
>                                    Qxe4 Qe7 8. Qxe7+ Kxe7 9. Kf1 Kd6
>               13    11:09  -0.50   1. Re3 Rg8 2. Qf4 g5 3. Qg4+ Kc7 4.
>                                    Qe2 Kb8 5. Re6 Nf7 6. Nf5 Rh8 7. c4
>                                    Qd7
>               13->  12:27  -0.50   1. Re3 Rg8 2. Qf4 g5 3. Qg4+ Kc7 4.
>                                    Qe2 Kb8 5. Re6 Nf7 6. Nf5 Rh8 7. c4
>                                    Qd7
>              time=16:40  cpu=99%  mat=0  n=179955245  fh=91%  nps=179928
>              ext-> checks=8708731 recaps=582645 pawns=42099 1rep=596393
>thrt:23648
>              predicted=0  nodes=179955245  evals=45453628
>              endgame tablebase-> probes done=0  successful=0
>              hashing-> trans/ref=22%  pawn=30%  used=99%



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