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Subject: Re: Nice tactical shot.

Author: Roy Eassa

Date: 16:24:11 01/26/02

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On January 25, 2002 at 15:51:34, Ernst Walet wrote:

>On January 25, 2002 at 02:37:48, Ernst Walet wrote:
>
>>On January 24, 2002 at 16:27:22, Roy Eassa wrote:
>>
>>>On January 24, 2002 at 15:58:27, Ernst Walet wrote:
>>>
>>>>On January 24, 2002 at 15:14:00, Roy Eassa wrote:
>>>>
>>>>>On January 23, 2002 at 22:04:13, Dan Andersson wrote:
>>>>>
>>>>>>[D]r2qkb1r/pb3p1p/1pp1p1pB/8/3PB1Q1/6P1/PPP2P1P/R3R1K1 w kq - 0 15
>>>>>>How does you favourite program do? Does it find 15. Bxc6+ in reasonable time?
>>>>>
>>>>>Fritz 7.0.0.6 on Athlon 1.2 takes over 6 minutes(!):
>>>>>
>>>>>1.Bg5 Be7 2.Bxe7 Qxe7 3.Qf3 0-0 4.Rad1 Qb4 5.b3 Qa3 6.Ra1 Qb2 7.c3 Rac8
>>>>>  ±  (0.79)   Depth: 10/26   00:00:02  1270kN
>>>>>  ²  (0.63)   Depth: 15/36   00:03:35  136212kN
>>>>>1.Bxc6+ Bxc6 2.Rxe6+ fxe6 3.Qxe6+ Be7 4.Qxc6+ Kf7 5.Qc4+ Ke8 6.Re1 Rc8 7.Rxe7+
>>>>>Kxe7 8.Bg5+
>>>>>  ²  (0.66)   Depth: 15/38   00:06:06  229372kN
>>>>>  +-  (1.85)   Depth: 16/38   00:07:11  271799kN
>>>>
>>>>
>>>>Roy, what hashtable size did you use?  With 512MB Fritz needs 400214kN,
>>>>
>>>>1.Bxc6+!
>>>>  ²  (0.69)   Depth: 15/41   00:10:07  400217kN
>>>>
>>>>and with 832MB hash Fritz needs 353330kN.
>>>>
>>>>1.Bxc6+!
>>>>  ²  (0.69)   Depth: 15/39   00:08:56  353330kN
>>>>
>>>>Ernst.
>>>
>>>
>>>Ernst, I use 384 MB hash.  I tested Fritz 7.0.0.6.  A bit of the time it was
>>>running in the background (behind the IE6 browser), so the times probably should
>>>have been a bit shorter.  I'm running WinXP on an Athlon 1.2 GHz.  What are the
>>>specs of your setup?
>>
>>
>>I have a Celeron 1200 with 1280MB ram, I usually use 832MB for hash and was
>>suprised that I needed more nodes than you, so I suspected that you used a very
>>large hashtable.  When I get home, I will try it with 384MB hash and report
>>again then.  I also run my system on WinXP.
>>
>>Ernst.
>
>Well, I ran the test with 384MB hash but need more nodes than you do, although
>it was less than with 512 and 832 MB hash.  Don't now why though.
>
>Ernst.


OK, I tried again.  This time it took Fritz 7.0.0.6 (XP, 1.2 GHz) almost 13
minutes.

Analysis by Fritz 7:

1.Bg5 Be7 2.Bxe7 Qxe7 3.Qf3 0-0 4.Rad1 Qb4 5.b3 Qa3 6.Ra1 Qb2 7.c3 Rac8
  ²  (0.63)   Depth: 15/34   00:04:03  138340kN
1.Bf4!
  ²  (0.66)   Depth: 15/39   00:09:33  317087kN
1.Bxc6+!
  ²  (0.69)   Depth: 15/40   00:12:49  425842kN
1.Bxc6+!
  ±  (0.85)   Depth: 15/40   00:12:52  427661kN
1.Bxc6+!
  ±  (1.16)   Depth: 15/40   00:13:16  441386kN
1.Bxc6+!
  +-  (1.79)   Depth: 15/41   00:13:43  455996kN
1.Bxc6+ Bxc6 2.Rxe6+ fxe6 3.Qxe6+ Be7 4.Qxc6+ Kf7 5.Qc4+ Ke8 6.Re1 Rc8 7.Rxe7+
Kxe7 8.Bg5+
  +-  (1.85)   Depth: 16/40   00:14:10  471919kN



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