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Subject: Re: Testposition - Pawn Magic

Author: Eduard Nemeth

Date: 14:18:32 08/18/01

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On August 18, 2001 at 15:18:32, Sune Larsson wrote:

>
>  [D]8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1
>
>        Ortueta - Sanz, 1934
>
>
>  This position might prove to be a good test. Deep Fritz had some problems
>  here. Found the correct move after 13:14 with -0.28, then went green
>  after 35:39 with -2.47. PIII 800 - 64 MB Hash.
>
>  Black wins after 1.-Rxb2! 2.Nxb2 c3 3.Rxb6 c4! 4.Rb4 a5!  True Pawn Magic!!
>
>
>  Ortueta - Sanz
>  8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1
>
>  Analysis by Deep Fritz: PIII 800 Mhz
>
>
>1...Bd8 2.Rxa7 Bf6 3.Rb7 Bd4+ 4.Kf1 Rf2+ 5.Ke1 Rxg2 6.h3
>  =  (0.19)   Depth: 8/20   00:00:00  67kN
>1...Bd8 2.Rxa7 Bf6 3.Kf1 Bxb2 4.Nxb2 Rxb2 5.a4 c3 6.a5
>  =  (0.22)   Depth: 9/20   00:00:00  123kN
>1...c3!
>  =  (0.19)   Depth: 9/20   00:00:00  149kN
>1...c3! 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4
>  =  (0.06)   Depth: 9/24   00:00:00  161kN
>1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4 Rc3 6.Kf2 Rxc4
>  =  (0.06)   Depth: 10/26   00:00:00  242kN
>1...Bd8!
>  =  (0.03)   Depth: 10/27   00:00:01  382kN
>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.Rxa7 Bxb2 5.Nxb2 Rxb2 6.a4 c3 7.a5
>  =  (-0.03)   Depth: 11/25   00:00:02  1076kN
>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.a3 Bd4 5.g4 Rh2 6.Rxa7 Bxb2
>  =  (-0.06)   Depth: 12/27   00:00:03  2041kN
>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.g4 Rh2 5.Rxa7 Bxb2 6.Nxb2 Rxb2 7.a4
>  =  (-0.03)   Depth: 13/28   00:00:07  4281kN
>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.a3 a6 5.Rb6 Kf5 6.Nxc5 Bxb2 7.Rxa6
>  =  (-0.06)   Depth: 14/31   00:00:13  8712kN
>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.a3 Bd4 5.g4 Rh2 6.Rxa7 Rxh3 7.Re7
>  =  (-0.16)   Depth: 15/32   00:00:36  23307kN
>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.g4 Rh2 5.Rxa7 Bxb2 6.Nxb2 Rxb2 7.Ra6+
>  =  (-0.16)   Depth: 16/34   00:01:27  56494kN
>1...c3!
>  =  (-0.19)   Depth: 16/34   00:01:33  60739kN, tb=4
>1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4 Rc3 6.Kf2 Rxc4 7.Re6
>  =  (-0.19)   Depth: 17/37   00:02:08  84446kN, tb=19
>1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4 Rc3 6.Kf2 Rxc4 7.Re6
>  =  (-0.22)   Depth: 18/36   00:04:21  173788kN, tb=70
>1...Bd8!
>  =  (-0.25)   Depth: 18/37   00:11:10  443095kN, tb=84
>1...Rxb2!
>  ³  (-0.28)   Depth: 18/38   00:13:14  527020kN, tb=84
>1...Rxb2! 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Rb5 c2 6.Kf2 c1Q 7.Ke2
>  -+  (-2.47)   Depth: 18/38   00:35:39  1415072kN, tb=108
>
>(Larsson, KIL 18.08.2001)

Nimzo 8 on P600, 128MB hash:

8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1

Analysis by Nimzo 8:


1...Ld8 2.h3 Lf6 3.Kf1 Kg6 4.g4 Th2 5.Txa7 Lxb2 6.Sxb2 Txb2
  =  (-0.09)   Tiefe: 13/29   00:01:50  49313kN
1...Ld8 2.g3 Lf6 3.Kh1 Kh6 4.Td7 Txd7 5.b3 cxb3 6.axb3 Lb2
  ³  (-0.27)   Tiefe: 14/31   00:07:02  193802kN
1...Txb2
  ³  (-0.28)   Tiefe: 14/31   00:07:39  211583kN
1...Txb2
  µ  (-0.88)   Tiefe: 14/31   00:08:31  236856kN
1...Txb2 2.Te7 Txa2 3.Sc3 Ta3 4.Te3 a5 5.Th3+ Kg8 6.Tg3 Lc7
  -+  (-3.11)   Tiefe: 14/31   00:14:26  406083kN

(Nemeth, Stuttgart 18.08.2001)




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