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Subject: Re: Positional/Real Sacrifice

Author: Robert Hyatt

Date: 14:36:19 11/30/99

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On November 30, 1999 at 11:30:03, Dann Corbit wrote:

>Interesting. My 17.2 never even looks at it.  Could it be a fluke of move
>ordering under multiple CPU's?  Do you get the same answer each time?
>
>Crafty 17.2 vs ferret
>pondering enabled.
>EGTB cache memory = 16M bytes.
>hash table memory = 48M bytes.
>pawn hash table memory = 8M bytes.
>play best book line after search.
>EGTB access enabled
>using tbpath=e:/crafty/release/tb,F:/KBP
>4 piece tablebase files found
>1302kb of RAM used for TB indices and decompression tables
>
>
>Crafty v17.2
>
>White(1): epdpfga epd.epd epd.out
>PFGA: EPD record: 1
>middle-game phase
>              clearing hash tables
>              time surplus   0.00  time limit 133:20 (133:20)
>         nss  depth   time  score   variation (1)
>                6     1.02   0.27   1. Rf3 Rd8 2. Qf2 Nd4 3. Re3 Bg4
>                6     1.47   0.31   1. Qd1 Qd7 2. Qf3 Bg4 3. Qd5 Rae8 <HT>
>                6->   1.74   0.31   1. Qd1 Qd7 2. Qf3 Bg4 3. Qd5 Rae8 <HT>
>                7     2.80   0.30   1. Qd1 Nb4 2. Qf3 b6 3. a4 Nxd3 4.
>                                    cxd3 c5
>                7     4.03   0.31   1. Rf3 Qd7 2. Rg3 Qd4+ 3. Qf2 Qf6 4.
>                                    c3 Rae8
>                7->   5.11   0.31   1. Rf3 Qd7 2. Rg3 Qd4+ 3. Qf2 Qf6 4.
>                                    c3 Rae8
>                8     6.81   0.35   1. Rf3 Qd7 2. Rg3 Qd4+ 3. Qf2 Qf6 4.
>                                    c5 Rae8 5. c4
>                8->  10.70   0.35   1. Rf3 Qd7 2. Rg3 Qd4+ 3. Qf2 Qf6 4.
>                                    c5 Rae8 5. c4
>                9    19.52   0.43   1. Rf3 Qd7 2. Qf2 Qd4 3. Qxd4 Nxd4
>                                    4. Rg3 g5 5. c3 Nf5
>                9->  22.12   0.43   1. Rf3 Qd7 2. Qf2 Qd4 3. Qxd4 Nxd4
>                                    4. Rg3 g5 5. c3 Nf5
>               10     1:18   0.52   1. Rf3 Rd7 2. Rg3 h5 3. Qf2 h4 4. Rg5
>                                    h3 5. Qg3 f6
>               10->   1:25   0.52   1. Rf3 Rd7 2. Rg3 h5 3. Qf2 h4 4. Rg5
>                                    h3 5. Qg3 f6
>               11     3:01   0.41   1. Rf3 Qd7 2. Qf2 Nb4 3. Rg3 Nxd3 4.
>                                    cxd3 Bg4 5. Bxc7 Be2 6. Re1 Bxd3 7.
>                                    Rxe7 Qxe7 8. Rxd3 Qxc7
>               11->   4:19   0.41   1. Rf3 Qd7 2. Qf2 Nb4 3. Rg3 Nxd3 4.
>                                    cxd3 Bg4 5. Bxc7 Be2 6. Re1 Bxd3 7.
>                                    Rxe7 Qxe7 8. Rxd3 Qxc7
>               12    13:28   0.57   1. Rf3 h5 2. Rg3 f6 3. Re1 Rc8 4. Rge3
>                                    Qf7 5. Qf2 <HT>
>               12->  15:16   0.57   1. Rf3 h5 2. Rg3 f6 3. Re1 Rc8 4. Rge3
>                                    Qf7 5. Qf2 <HT>
>               13    23:45   1/38   1. Rf3


this looks similar to mine.  How the other 17.2 got +1.something is beyond me,
as it has a huge penalty for trading a bishop for two pawns...



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