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Subject: Re: Positional/Real Sacrifice

Author: Robert Hyatt

Date: 19:13:33 11/30/99

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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,
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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