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Subject: Re: Positional/Real Sacrifice

Author: Ricardo Gibert

Date: 00:34:06 12/01/99

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On November 30, 1999 at 22:13:33, Robert Hyatt wrote:

>On November 30, 1999 at 18:44:38, Ricardo Gibert wrote:
>
>>On November 30, 1999 at 17:36:19, Robert Hyatt wrote:
>>
>>>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...
>>
>>3 pawns. 1 Bxh6 gxh6 2 Qxh6 f5 3 Bxf5...
>
>
>you are looking too far ahead.  Check the original Rebel output... 3 moves only,

OK. Context matters. My comments were based solely on the output generated by
crafty.

>Bxh6 gxh6 Qxh6 and there the captures stopped.  But even a piece for 3 pawns
>loses most of the time, unless the pawns are well advanced and mobile...
>
>or unless it is an attack that works of course...






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