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Subject: Re: Difficult Hydra position follow-up, 36.Kh1

Author: Brian Katz

Date: 16:21:08 05/15/05

Go up one level in this thread


On May 15, 2005 at 17:21:12, John Merlino wrote:

>On May 15, 2005 at 14:26:41, Eelco de Groot wrote:
>
>>Hello all,
>>
>>I am testing some Pro Deo 1.1 settings in a position that
>>
>>Vincent Lejeune posted here a few weeks ago, between the
>>
>>Hydra-Scylla version that's going to take on Michael Adams, and
>>
>>a testversion(?) of Shredder. Hydra played the pawn sac, I
>>
>>think it is a strategic pawn-offer, 35.b4!
>>
>>
>>Now my testversion wants to play 36.Kh1 after the reply
>>
>>35..Qb6. Shredder accepted the pawn with 35..Qxb4 but that
>>
>>seems not so good. That the Pro Deo testversion plays 36.Kh1 may be a fluke, I
>>am testing
>>[Pruning = MISC_58]             * Recalculate passed pawns
>>[M58_Table = normal]            * normal|midg|endg|strong
>>(Albert Silver didnt'entirely trust this switch)
>>
>>I was wondering, are there any
>>
>>engines/programs that consistenty play 36.Kh1? The alternative,
>>
>>also good is 35.b4 Qb6 36.c5. I think 36.Kh1 will be harder to find,
>>
>>strategic, but rather deep! -Writing this, I see that Gandalf
>>
>>just comes up at ply 15 with a score of 0.83 for 36.Kh1!-
>>
>>[D]r3r1k1/1p3pp1/pqbp1b1B/4n3/1PPN4/7P/2BR1QP1/5RK1 w - - 1 1
>
>CM9_R1 on a P4-2.4 plays Kh1 in one second, and needs 29 seconds to get a
>positive score for White:
>
>Time	Depth	Score	Positions	Moves
>0:00	1/3	-0.10	2484		1.Nxc6 Qxc6 2.Qf5
>0:00	1/4	-0.44	6043		1.Nxc6 Qxc6 2.b5 axb5
>0:00	1/5	-0.45	23959		1.Nxc6 Qxf2+ 2.Rdxf2 Nxc6 3.Ba4
>					Nxb4 4.Bxe8 Rxe8
>0:00	1/6	-1.14	64241		1.Nxc6 Qxf2+ 2.Rdxf2 bxc6 3.b5
>					axb5 4.cxb5 Ra2
>0:00	1/6	-1.08	87559		1.c5 dxc5 2.Nxc6 Qxc6 3.Qxc5 Qxc5+
>					4.bxc5 Nc4
>0:01	1/6	-0.55	153442		1.Rdd1 Qxb4 2.Qg3 Nf3+ 3.Nxf3 Qxc4
>					4.Rxd6
>0:01	1/6	-0.05	255589		1.Kh1 Qxb4 2.Qg3 Bf3 3.Nxf3 Nxc4
>0:03	1/7	-0.12	450947		1.Kh1 Qd8 2.Qf5 Ng6 3.Nxc6 bxc6
>					4.Bf4 Nxf4 5.Qxf4
>0:06	1/8	-0.43	1038475		1.Kh1 Qd8 2.Nxc6 bxc6 3.Rd4 c5
>					4.bxc5 gxh6 5.Qxf6 Qxf6 6.Rxf6
>0:29	1/9	0.28	4664621		1.Kh1 Qxb4 2.Qg3 Bf3 3.gxf3 Qxc4
>					4.Rc1 Nd3 5.Bxg7
>1:18	2/10	0.43	12152328	1.Kh1 Qd8 2.Qg3 g6 3.Bb3 Bh4 4.Nxc6
>					bxc6 5.Qc3 Qe7
>2:59	2/11	0.42	29265290	1.Kh1 Qd8 2.Qg3 g6 3.Re2 Rb8 4.Qf2
>					Nd7 5.Rxe8+ Qxe8 6.Nxc6 bxc6 7.Re1
>
>jm


Shredder 9 UCI Run on Fritz 8 interface......AMD Athlon XP 2600+ I Gig DDR SDRAM

Hash Set at 256 MB.......Took 14 seconds to evaluate the position + (0.32)

New game,
r3r1k1/1p3pp1/pqbp1b1B/4n3/1PPN4/7P/2BR1QP1/5RK1 w - - 0 1

Analysis by Shredder 9.02 UCI:

1.Nxc6
  ³  (-0.61)   Depth: 1/4   00:00:00
1.Nxc6 Qxc6
  ³  (-0.33)   Depth: 1/11   00:00:00
1.Kh1
  =  (0.00)   Depth: 1/11   00:00:00
1.Kh1
  =  (0.00)   Depth: 1/11   00:00:00
1.Kh1
  =  (-0.09)   Depth: 2/11   00:00:00
1.Kh1
  ³  (-0.68)   Depth: 3/12   00:00:00
1.Kh1
  -+  (-1.46)   Depth: 3/12   00:00:00
1.Kh1 Nxc4 2.Nxc6 Qxf2 3.Rdxf2 bxc6
  -+  (-2.55)   Depth: 3/16   00:00:00
1.Nxc6
  -+  (-2.54)   Depth: 3/16   00:00:00
1.Nxc6
  -+  (-2.19)   Depth: 3/16   00:00:00
1.Nxc6 Qxc6 2.Qf5 Qb6+ 3.Rdf2 Qxb4
  µ  (-1.21)   Depth: 3/16   00:00:00
1.Nxc6 Qxc6
  µ  (-0.96)   Depth: 4/16   00:00:00
1.Nxc6 Qxc6 2.Qf5 Nxc4 3.Qh7+ Kf8
  µ  (-0.95)   Depth: 4/16   00:00:00
1.Nxc6 Qxc6
  ³  (-0.70)   Depth: 5/16   00:00:00
1.Nxc6 Qxf2+ 2.Rfxf2 Nxc6 3.Ba4
  ³  (-0.50)   Depth: 5/16   00:00:00
1.Nxc6 Qxf2+
  µ  (-0.75)   Depth: 6/16   00:00:00  19kN
1.Nxc6 Qxf2+ 2.Rdxf2 bxc6 3.Be4 Nxc4
  µ  (-0.78)   Depth: 6/16   00:00:00  22kN
1.Nxc6 Qxf2+
  µ  (-1.03)   Depth: 7/16   00:00:00  59kN
1.Nxc6 Qxf2+ 2.Rdxf2 bxc6 3.Be4 Bh4 4.Rf4
  µ  (-1.17)   Depth: 7/18   00:00:01  67kN
1.Nxc6 Qxf2+
  -+  (-1.42)   Depth: 8/18   00:00:01  168kN
1.Nxc6 Qxf2+
  -+  (-1.92)   Depth: 8/18   00:00:01  185kN
1.Nxc6 Qxf2+ 2.Rfxf2 bxc6 3.Rxf6 gxf6 4.Rxd6 Rab8 5.Bd2
  -+  (-2.00)   Depth: 8/18   00:00:01  215kN
1.Qg3
  -+  (-1.99)   Depth: 8/25   00:00:01  277kN
1.Qg3 Nf3+ 2.gxf3 Bxd4+ 3.Kh2 Be5 4.f4 Bf6 5.Rb1 Rad8 6.Qg1
  -+  (-1.80)   Depth: 8/25   00:00:01  389kN
1.Qf5
  -+  (-1.79)   Depth: 8/27   00:00:01  420kN
1.Qf5 Nf3+ 2.gxf3 Bxd4+ 3.Kh1 g6 4.Qd3 Be5 5.Rb1 Bd7 6.Kg2
  -+  (-1.67)   Depth: 8/31   00:00:01  496kN
1.Bb3
  -+  (-1.66)   Depth: 8/31   00:00:02  546kN
1.Bb3 Be4 2.Qe3
  -+  (-1.66)   Depth: 8/31   00:00:02  562kN
1.Rdd1
  -+  (-1.65)   Depth: 8/31   00:00:02  616kN
1.Rdd1
  µ  (-1.30)   Depth: 8/31   00:00:02  640kN
1.Rdd1 Rab8 2.Nxc6 Qxf2+ 3.Rxf2 bxc6 4.Rxd6 Rxb4
  µ  (-1.23)   Depth: 8/31   00:00:02  860kN
1.c5
  µ  (-1.22)   Depth: 8/31   00:00:02  913kN
1.c5
  µ  (-0.87)   Depth: 8/31   00:00:02  930kN
1.c5 dxc5 2.Qg3 cxd4
  µ  (-0.87)   Depth: 8/31   00:00:02  941kN
1.c5 dxc5
  ³  (-0.62)   Depth: 9/31   00:00:04  1225kN
1.c5 dxc5 2.Qg3 Ng6 3.Rxf6 cxd4 4.Bxg6 fxg6 5.Qxg6 Re1+ 6.Kh2 Qc7+ 7.Rf4
  ³  (-0.36)   Depth: 9/31   00:00:04  1387kN
1.c5 dxc5
  ³  (-0.61)   Depth: 10/32   00:00:05  1950kN
1.c5 dxc5 2.Qg3 Nf3+ 3.Nxf3 cxb4+ 4.Kh2 a5 5.Ng5
  ³  (-0.61)   Depth: 10/32   00:00:06  2198kN
1.Kh1
  ³  (-0.60)   Depth: 10/34   00:00:08  2857kN
1.Kh1 Nd7 2.Bxg7
  ³  (-0.26)   Depth: 10/34   00:00:08  3132kN
1.Kh1 Nd7
  =  (-0.01)   Depth: 11/34   00:00:10  3929kN
1.Kh1 Qd8 2.Nf5 Re6 3.Qg3 Nxc4 4.Bxg7 Bg5 5.Rdf2 Nd2 6.Rd1
  ²  (0.32)   Depth: 11/34   00:00:14  5385kN
1.Kh1 Bd8 2.Qg3 g6 3.Nxc6 Qxc6 4.Bb3 Kh7 5.Be3
  ²  (0.55)   Depth: 12/35   00:00:23  8619kN
1.Kh1 Qd8 2.Qg3 Nxc4
  ²  (0.48)   Depth: 13/35   00:00:41  15624kN
1.Kh1 Qd8 2.Nxc6 bxc6 3.Qg3 g6 4.Rd4 Bg7 5.Bd2 Qb6 6.Rh4 d5 7.cxd5 cxd5 8.Be3
Qb5 9.Rf2
  ²  (0.30)   Depth: 14/38   00:01:04  25019kN

Brian



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