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Subject: Re: Give it a BIT time!

Author: Jaime Benito de Valle Ruiz

Date: 10:17:42 06/16/04

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On June 16, 2004 at 13:12:55, Ingo Bauer wrote:

>Hi
>
>[D]r4rk1/1b3pp1/p5qp/1p1nP1N1/4N2P/3Q4/PP3PP1/R3R1K1 b - - 0 21
>
>Hi
>S8; Athlon@2500MHz, 256 MB Hash, 53s - Chess is more than BLITZ!
>(It might be the anti trojan, Shredder just needs a certain depth to eliminate
>this!)
>
>Engine: Shredder 8 (256 MB)
>by Stefan Meyer-Kahlen
>
>11/21  0:01   -0.38    1...Nf4 2.Qg3 Bxe4 3.Qxf4 Bd5 4.Ne4 Rad8
>                       5.a4 bxa4 6.Rxa4 Rfe8 7.Rc1 Bxe4
>                       8.Rxe4 (785.430) 452
>
>12/26  0:03   -0.38    1...Nf4 2.Qg3 Bxe4 3.Qxf4 Bd5 4.Nf3 Rad8
>                       5.Rad1 Rfe8 6.b3 Bxf3 7.Qxf3 Rxd1
>                       8.Qxd1 Qf5 (1.433.551) 458
>
>13/26  0:05   -0.41    1...Nf4 2.Qg3 Bxe4 3.Qxf4 Bd5 4.Ne4 Rad8
>                       5.a4 Bb7 6.axb5 Rd4 7.f3 Bxe4 8.Rxe4 axb5
>                       9.Rxd4 (2.695.846) 468
>
>14/29  0:10   -0.40    1...Nf4 2.Qg3 Bxe4 3.Qxf4 Bd5 4.b3 Rac8
>                       5.Rad1 Rfd8 6.Ne4 a5 7.Rd2 Kh7 8.Ng3 Kg8 (4.882.285) 472
>
>15/38  0:20   -0.65--  1...Nf4 2.Qg3 Bxe4 3.Nxe4 Qxg3
>                       4.Nxg3 Nd3 5.Re2 Rfe8 6.Rd1 Nxe5
>                       7.Rde1 Rac8 8.Rxe5 f6 9.Rxe8+ Rxe8 (9.635.907) 474
>
>15/38  0:23   -0.66    1...Nf4 2.Qg3 Bxe4 3.Nxe4 Qxg3
>                       4.Nxg3 Nd3 5.Re2 Rfc8 6.a4 bxa4
>                       7.Rxa4 Re8 8.Ra5 Reb8 9.Nf5 Rxb2
>                       10.Rxb2 (11.503.583) 485
>
>16/43  0:47   -0.72    1...Nf4 2.Qg3 Bxe4 3.Nxe4 Qxg3
>                       4.Nxg3 Rfe8 5.Rad1 Rad8 6.Rxd8 Rxd8
>                       7.Re4 Rd1+ 8.Nf1 Nd3 9.e6 Nxf2
>                       10.Kxf2 (22.932.705) 485
>
>16/43  0:53   -0.71++  1...hxg5 2.hxg5 Nb4 3.Qb1 Bxe4
>                       4.Rxe4 a5 5.a3 Nc6 6.Qa2 (26.045.478) 488
>
>16/43  1:06   -0.62    1...hxg5 2.hxg5 Nb4 3.Qd2 Bxe4
>                       4.Qxb4 Bd5 5.Qh4 Rfe8 6.Re3 Be6 7.a4 bxa4
>                       8.Qxa4 Qxg5 9.Qxa6 Rxa6 (32.689.455) 492
>
>17/38  1:31   -0.63    1...hxg5 2.hxg5 Nb4 3.Qd2 Bxe4
>                       4.Qxb4 Bb7 5.Qf4 Qc2 6.b3 Rad8 7.Qe4 Bxe4
>                       8.f4 Bxg2 (44.537.016) 487
>
>18/38  2:31   -0.45    1...hxg5 2.hxg5 Nb4 3.Qd2 Bxe4
>                       4.Qxb4 Bd5 5.Qh4 Rac8 6.b3 Rc2
>                       7.Rad1 Rd8 8.a3 Qh7 9.Qf4 Qh5 10.e6 fxe6
>                       11.b4 (73.230.913) 483
>
>19/46  4:18   -0.45    1...hxg5 2.hxg5 Nb4 3.Qd2 Bxe4
>                       4.Qxb4 Bb7 5.Qg4 Rad8 6.Rad1 Rxd1
>                       7.Rxd1 Qc2 8.e6 fxe6 9.Qxe6+ Kh8
>                       10.Qh3+ Kg8 (123.315.370) 477
>
>best move: h6xg5 time: 5:11.781 min  n/s: 476.379  CPU 99.9%   n/s(1CPU):
>476.855  nodes: 148.526.185
>
>regards
>Ingo
>
>PS: I do a longer analysis to see if eval rises!

Yes, it eventually finds the right move, but that's not the issue; after four
minutes it still comes up with only -0.45. Why does it gives a more realistic
score (less than 2 pawns) if you force one move and wait for a small fraction of
a second (a few plies)?
I've only tried this position with Ruffian 1.0.5, and it gives less than -2.00
from ply 1.
Something's not right here, if you ask me.


Jaime



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