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Subject: Re: Position For Analysis

Author: Melvin S. Schwartz

Date: 13:28:03 03/06/00

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On March 06, 2000 at 16:00:02, Dann Corbit wrote:

>Crafty likes Bxb2+ from the get-go and stays with it.  It does seem to be
>dropping in eval over time.

Hello Dann,

That does surprise me. I don't know if you saw my original post stating that
Fritz 5.32, Hiarcs 7.32, and CSTal 2.03 all liked Bh2+. CM7000 and Rebel 10
liked Bxb2+. Rebel-Tiger likes Bf4+. Personally, I see the danger of the rook at
g1 to be more important than Bxb2+ and going after the rook at a1. What is very
interesting is Rebel-Tiger's choice of Bf4+ with the intention of taking White's
Bishop at h6. This is a very interesting choice which still leaves the rook I
was concerned about at g1 active. However, Tiger seems to be able to hold the
line. I also wonder if Tiger is the only program to actually play Bf4+?

Mel
>
>PFGA: EPD record: 1
>              clearing hash tables
>              time surplus   0.00  time limit 30:00 (30:00)
>         nss  depth   time  score   variation (1)
>Black(0): exit
>
>                6     0.73   3.67   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Bg7
>                                    4. Bxg6 Bxh6 5. Qxh6 fxg6 6. Rxg6+
>                6->   1.71   3.67   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Bg7
>                                    4. Bxg6 Bxh6 5. Qxh6 fxg6 6. Rxg6+
>                7     2.17   3.56   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Bg7
>                                    4. Bxg6 fxg6 5. Rxg6
>                7->   4.95   3.56   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Bg7
>                                    4. Bxg6 fxg6 5. Rxg6
>                8     7.29   3.41   1. ... Bxb2+ 2. Kf1 Bxa1 3. Bxg6 fxg6
>                                    4. Rxg6+ Bg7 5. Qxh5 Re7 6. Kg1
>                8->  14.64   3.41   1. ... Bxb2+ 2. Kf1 Bxa1 3. Bxg6 fxg6
>                                    4. Rxg6+ Bg7 5. Qxh5 Re7 6. Kg1
>                9    19.74   3.29   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Ne7
>                                    4. Bf4 Bg7 5. Qh4 Be5 6. Kg2 Bxf4 7.
>                                    Qxf4
>                9->  38.16   3.29   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Ne7
>                                    4. Bf4 Bg7 5. Qh4 Be5 6. Kg2 Bxf4 7.
>                                    Qxf4
>               10    50.32     --   1. ... Bxb2+
>               10     1:10   2.87   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Ne7
>                                    4. Bf4 Bg7 5. Qg5 Qd7 6. Nxd6 Qxh3+
>                                    7. Ke2
>               10->   2:20   2.87   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Ne7
>                                    4. Bf4 Bg7 5. Qg5 Qd7 6. Nxd6 Qxh3+
>                                    7. Ke2
>               11     2:57     --   1. ... Bxb2+
>               11     3:49   2.40   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Re7
>                                    4. Bg5 a6 5. Bxe7 Nxe7 6. Na3 Qa5 7.
>                                    Nc2 Qxa2
>               11->   9:22   2.40   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Re7
>                                    4. Bg5 a6 5. Bxe7 Nxe7 6. Na3 Qa5 7.
>                                    Nc2 Qxa2
>               12    12:27   2.36   1. ... Bxb2+ 2. Kf1 Bxa1 3. Qxh5 Ne7
>                                    4. Bxg6 Nxg6 5. Rxg6+ fxg6 6. Qxg6+
>                                    Kh8 7. Nxd6 Re7 8. Nf7+ Rxf7 9. Qxf7
>                                    Qh4
>              time=30:00  cpu=100%  mat=0  n=237650502  fh=93%  nps=131991
>              ext-> checks=12103875 recaps=510989 pawns=5013 1rep=760797
>thrt:23817
>              predicted=0  nodes=237650502  evals=37305123
>              endgame tablebase-> probes done=0  successful=0



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