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Subject: Re: Positional test - Paralyzing the Knight

Author: Ernst Walet

Date: 10:59:18 02/28/01

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On February 28, 2001 at 11:37:30, Enrique Irazoqui wrote:

>On February 28, 2001 at 11:12:09, Sune Larsson wrote:
>
>>
>>  [D]4n3/1b3k1p/p2p2p1/3Pp3/2P3P1/6PP/2BB4/6K1 w - - 0 1
>>
>>  This is Hort-Ciocaltea, Budapest 1973. Only two moves are required
>>  to immobilize the black knight and pave the way for the victorious
>>  march of the white king to the deserted queenside:
>>
>>  1.g5! Bc8 2.g4! and black's position is ripe for resignation.
>>
>>  Test: The above move order should be rewarded with big +scores for white.
>>
>>  Sune
>
>This one took a whopping 1 second. The eval is climbing, but so is my
>impatience. :)
>
>New position
>4n3/1b3k1p/p2p2p1/3Pp3/2P3P1/6PP/2BB4/6K1 w - - 0 1
>
>Analysis by DEEP FRITZ   :
>
>1.Bxg6+--
>  -+  (-2.03)   Depth: 1/3   00:00:00
>1.Bxg6+-- Kxg6
>  -+  (-2.81)   Depth: 1/3   00:00:00
>1.c5!
>  -+  (-2.09)   Depth: 1/3   00:00:00
>1.c5! Bxd5
>  -+  (-1.75)   Depth: 1/5   00:00:00
>1.Kf2!
>  µ  (-0.75)   Depth: 1/5   00:00:00
>1.Kf2!
>  =  (-0.25)   Depth: 1/5   00:00:00
>1.Kf2 Nf6
>  ³  (-0.37)   Depth: 2/5   00:00:00
>1.Kf2 Nf6 2.Be3
>  =  (-0.22)   Depth: 3/6   00:00:00
>1.Kf2 Nf6 2.Be3 Ke7
>  =  (-0.22)   Depth: 4/8   00:00:00
>1.Kf2 Bc8 2.Be3 Nf6 3.g5
>  =  (-0.12)   Depth: 5/11   00:00:00  1kN
>1.Kf2 Bc8 2.Be3 Nf6 3.g5 Nd7
>  =  (-0.12)   Depth: 6/12   00:00:00  3kN
>1.Kf2 Bc8 2.Be3 h5 3.gxh5 gxh5 4.Kg2 Nf6
>  =  (-0.19)   Depth: 7/16   00:00:00  15kN
>1.Kf2 Bc8 2.Bb4 Bd7 3.c5 dxc5 4.Bxc5 Nf6 5.Bd3
>  =  (-0.12)   Depth: 8/17   00:00:00  35kN
>1.Kf2 Ke7 2.Be3 Bc8 3.Kf3 Nf6 4.g5 Nd7 5.Ke4
>  =  (-0.09)   Depth: 9/21   00:00:00  88kN
>1.Kf2 Bc8 2.Bb4 h5 3.gxh5 gxh5 4.Kg2 Bd7 5.Bd1 Kg6 6.c5 dxc5
>  =  (0.00)   Depth: 10/20   00:00:00  188kN
>1.Kf2 Bc8 2.Bb4 h5 3.gxh5 gxh5 4.Kg2 Bd7 5.c5 dxc5 6.Bxc5 Nf6
>  =  (-0.12)   Depth: 11/21   00:00:00  421kN
>1.g5!
>  =  (-0.09)   Depth: 11/23   00:00:01  626kN
>1.g5 Bc8 2.g4 Ke7 3.Kf2 Bd7 4.Be4 Ba4 5.Be3 Bb3 6.c5 dxc5
>  =  (0.03)   Depth: 12/22   00:00:01  935kN
>1.g5 Bc8 2.g4 Ke7 3.Kf2 Nc7 4.Be3 Bb7 5.h4 Bc8 6.h5 Kf7
>  =  (0.09)   Depth: 13/24   00:00:02  1495kN
>1.g5 Bc8 2.g4 Ke7 3.Kf2 Bb7 4.Be3 a5 5.Bb6 Ba6 6.Bxa5 Bxc4
>  =  (0.13)   Depth: 14/25   00:00:04  2463kN
>1.g5 Bc8 2.g4 Ke7 3.Kf2 Bb7 4.Be3 Nc7 5.h4 Bc8 6.h5 Kf7
>  =  (0.19)   Depth: 15/29   00:00:08  4569kN
>1.g5 Bc8 2.g4 Ke7 3.Kf2 Bb7 4.Be3 Ng7 5.h4 a5 6.Bb6 Ba6
>  =  (0.16)   Depth: 16/28   00:00:12  6746kN
>1.g5 Bc8 2.g4 Ke7 3.Kf2 Nc7 4.Ba5 Ne8 5.Bb6 Bb7
>  ²  (0.28)   Depth: 17/30   00:00:39  22594kN
>1.g5 Bc8 2.g4 Ke7 3.Kf2 Nc7 4.Kf3 Bb7 5.h4 Ne8 6.Be3 Kf7
>  ²  (0.34)   Depth: 18/33   00:01:18  45587kN
>
>(Irazoqui, Cadaqués 28.02.2001)


Interresting to see that latest Fritz6 takes a somewhat different path, making
the king moves Ke7 and Kf2 between g5 an g4.  Fritz6 also seems more selective,
using less nodes per ply.


Ernst.


Analysis by Fritz 6:

1.c5--
  µ  (-1.12)   Depth: 1/3   00:00:00
1.c5-- dxc5
  -+  (-1.44)   Depth: 1/3   00:00:00
1.Kf2!
  µ  (-0.84)   Depth: 1/3   00:00:00
1.Kf2!
  ³  (-0.34)   Depth: 1/3   00:00:00
1.Kf2 Nf6
  ³  (-0.37)   Depth: 2/5   00:00:00
1.Kf2 Nf6 2.g5
  =  (-0.22)   Depth: 3/5   00:00:00
1.Kf2 Ke7 2.Bg5+ Nf6 3.Ke2
  =  (-0.19)   Depth: 4/9   00:00:00
1.Kf2 Ke7 2.g5 Nc7 3.Ke2
  =  (-0.12)   Depth: 5/11   00:00:00  1kN
1.Kf2 h5 2.gxh5 gxh5 3.Be3 Bc8 4.h4
  =  (-0.12)   Depth: 6/13   00:00:00  5kN
1.Kf2 h5 2.gxh5 gxh5 3.g4 hxg4 4.hxg4 Ng7 5.g5
  =  (-0.06)   Depth: 7/13   00:00:00  14kN
1.Kf2 Ke7 2.Ke2 Ng7 3.Bg5+ Kf7 4.Be3 a5 5.g5
  =  (-0.03)   Depth: 8/17   00:00:00  43kN
1.Kf2 Ke7 2.Ke2 Nf6 3.g5 Nh5 4.Be1 Bc8 5.h4 Bg4+
  =  (-0.06)   Depth: 9/17   00:00:00  73kN
1.Kf2 Bc8 2.Bc3 Ke7 3.Ke2 Nf6 4.Bd2 Bb7
  =  (-0.06)   Depth: 10/21   00:00:00  248kN
1.Bb4!
  =  (-0.03)   Depth: 10/22   00:00:01  322kN
1.Bb4! Ke7
  =  (0.00)   Depth: 10/22   00:00:01  332kN
1.Bb4 Ke7 2.Kf2 Nf6 3.g5 Nd7 4.Ke2 Nc5 5.Ke3 Kd7
  =  (-0.03)   Depth: 11/22   00:00:01  435kN
1.g5!
  =  (0.00)   Depth: 11/22   00:00:01  592kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Bc8 5.Ke2 Bb7
  =  (0.19)   Depth: 12/21   00:00:02  864kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.h4 Bc8
  =  (0.13)   Depth: 13/23   00:00:03  1092kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.h4 Bc8
  =  (0.13)   Depth: 14/24   00:00:03  1406kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.h4 Bc8
  =  (0.13)   Depth: 15/26   00:00:05  2028kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.h4 Ke7
  =  (0.13)   Depth: 16/28   00:00:08  3175kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.h4 Ke7
  =  (0.13)   Depth: 17/29   00:00:17  6453kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.h4 Ke7
  =  (0.19)   Depth: 18/30   00:00:34  12557kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.Ke3 Ba8
  ²  (0.47)   Depth: 19/34   00:02:00  44348kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.Ke3 Ke7
  ²  (0.47)   Depth: 20/34   00:03:09  69961kN
1.g5 Ke7 2.Kf2 Bc8 3.g4 Bb7 4.Ba5 Kf7 5.Ke3 Ke7
  ²  (0.31)   Depth: 21/34   00:04:47  105743kN





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