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Subject: Re: Crafty vs Rxc4 - 6 hours

Author: Dann Corbit

Date: 15:59:28 08/01/02

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On August 01, 2002 at 18:52:09, Slater Wold wrote:

>Tested on a dual AMD 1.73Ghz.  Crafty 18.15 from Hyatt's FTP.
>
>
>
>White(1): setboard r1r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K b - -
>Black(1): go
>              clearing hash tables
>              time surplus   0.00  time limit 360:00 (360:00)
>         nss  depth   time  score   variation (1)
>starting thread 1
>                5     0.12   0.91   1. ... Ra2 2. h3 Bc5 3. Nc1 Rc2
>                5     0.31   0.82   1. ... Ra6 2. cxb4 Bxb4 3. Ng3 Kg8
>                                    4. Kg1
>         (3)    5->   0.32   0.82   1. ... Ra6 2. cxb4 Bxb4 3. Ng3 Kg8
>                                    4. Kg1
>         (2)    6     0.46   0.83   1. ... Ra6 2. h3 bxc3 3. Nxc3 Nc5 4.
>                                    Bxf6+ Bxf6 5. Nd5 Bg5
>                6     0.78   0.78   1. ... Ra2 2. cxb4 Bxb4 3. Nc1 Rc2
>                                    4. Kg1 Ng4
>                6->   0.85   0.78   1. ... Ra2 2. cxb4 Bxb4 3. Nc1 Rc2
>                                    4. Kg1 Ng4
>                7     1.15   0.86   1. ... Ra2 2. cxb4 Bxb4 3. Nc1 Ra1
>                                    4. Nd3 Rxd1 5. Rxd1 Bc3
>                7     2.98   0.73   1. ... Ra6 2. cxb4 Bxb4 3. Rd3 Kg8
>                                    4. Ng3 Bc5 5. Bh6
>         (2)    7->   3.23   0.73   1. ... Ra6 2. cxb4 Bxb4 3. Rd3 Kg8
>                                    4. Ng3 Bc5 5. Bh6
>                8     4.35   0.74   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Bc5
>                                    4. Nd3 Bd4 5. Rb1 Ra2
>                8->   5.12   0.74   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Bc5
>                                    4. Nd3 Bd4 5. Rb1 Ra2
>                9     7.96   0.75   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Nh7
>                                    4. Bh4 Kg8 5. Nd3 Be7 6. Bxe7 Qxe7
>                9->  11.03   0.75   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Nh7
>                                    4. Bh4 Kg8 5. Nd3 Be7 6. Bxe7 Qxe7
>               10    20.48   0.74   1. ... Ra6 2. h3 Kg8 3. Nd2 bxc3 4.
>                                    Nxc3 Bc5 5. Nd5 Nh7 6. Bh6 Ra2
>               10->  27.43   0.74   1. ... Ra6 2. h3 Kg8 3. Nd2 bxc3 4.
>                                    Nxc3 Bc5 5. Nd5 Nh7 6. Bh6 Ra2
>               11    44.68   0.76   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Be7
>                                    4. Nd3 Nh7 5. Bxe7 Qxe7 6. Qg3 h4 7.
>                                    Qf2 Kg8
>         (2)   11->   1:26   0.76   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Be7
>                                    4. Nd3 Nh7 5. Bxe7 Qxe7 6. Qg3 h4 7.
>                                    Qf2 Kg8
>               12     1:52   0.76   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Nh7
>                                    4. Bh4 Nhf6 5. Nd3 Bc3 6. Bg5 Nh7 7.
>                                    Nf4 exf4 8. Qxc3+
>         (3)   12->   3:02   0.76   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Nh7
>                                    4. Bh4 Nhf6 5. Nd3 Bc3 6. Bg5 Nh7 7.
>                                    Nf4 exf4 8. Qxc3+
>         (2)   13     5:11   0.63   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Nh7
>                                    4. Bh4 Kg8 5. h3 Ndf6 6. Nd3 Bc3 7.
>                                    Rf2 Bd4 8. Nf4
>               13->   5:51   0.63   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Nh7
>                                    4. Bh4 Kg8 5. h3 Ndf6 6. Nd3 Bc3 7.
>                                    Rf2 Bd4 8. Nf4
>               14    16:40   0.70   1. ... Ra6 2. h3 Nc5 3. Rd5 Nfd7 4.
>                                    cxb4 Bxg5 5. bxc5 Rxc5 6. Qd3 Rc7 7.
>                                    Qg3 Ra2 8. Qxg5 Rxe2
>               14->  30:56   0.70   1. ... Ra6 2. h3 Nc5 3. Rd5 Nfd7 4.
>                                    cxb4 Bxg5 5. bxc5 Rxc5 6. Qd3 Rc7 7.
>                                    Qg3 Ra2 8. Qxg5 Rxe2
>               15    59:08   0.64   1. ... Ra6 2. h3 Kg8 3. Ne3 Nc5 4.
>                                    Nd5 Ncxe4 5. Nxe7+ Qxe7 6. Qxe4 Nxe4
>                                    7. Bxe7 bxc3 8. Rd7 Nd2 9. Rc1 Rac6
>               15->  67:56   0.64   1. ... Ra6 2. h3 Kg8 3. Ne3 Nc5 4.
>                                    Nd5 Ncxe4 5. Nxe7+ Qxe7 6. Qxe4 Nxe4
>                                    7. Bxe7 bxc3 8. Rd7 Nd2 9. Rc1 Rac6
>               16   169:50   0.63   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Ra1
>                                    4. Nd3 Rxd1 5. Rxd1 Bc3 6. h3 Kg8 7.
>                                    Rf1 Nh7 8. Bh6 Qf6 9. Qe2 Qh4 10. Qf3
>               16-> 220:49   0.63   1. ... Ra6 2. cxb4 Bxb4 3. Nc1 Ra1
>                                    4. Nd3 Rxd1 5. Rxd1 Bc3 6. h3 Kg8 7.
>                                    Rf1 Nh7 8. Bh6 Qf6 9. Qe2 Qh4 10. Qf3
>              time=360:00  cpu=399%  mat=0  n=33382794664  fh=93%  nps=1545k
>              ext-> chk=983771151 cap=80579769 pp=9925423 1rep=61533301 mate=587
>9294
>              predicted=0  nodes=33382794664  evals=2408593287
>              endgame tablebase-> probes done=0  successful=0
>              SMP->  split=1555  stop=261  data=10/32  cpu=1439:19  elap=360:00
>
>Black(1): Ra6

I suspect that no engine besides the Junior in the contest will find it without
tweaking parameters off from optimium.  I mean, even after a 1 week search on a
stupendous machine they will not find it.

I suspect (further) that even *after* Rxc4 it will take 24 hours for Crafty's
score to improve to the point where the move will be understood as better than
having moved Ra6 previously.



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