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Subject: Some analysis of Deep Fritz for kasparov-deeper blue first game

Author: Uri Blass

Date: 23:28:14 05/05/01


I gave Deep Fritz to analyze similiar number of nodes to Deeper blue and Deep
Fritz seems to be clearly better in tactics.

Deep Fritz needs only 191728 knodes to see the line Rf5+ Ke3
It means only 1 second if I asuume 200,000,000 nodes per second.

I believe that Rf5+ failed low at depth 17 for Deeper blue for the reason Ke3.
The pv of deeper blue at smaller depthes is Rf5+ Ke2

Deep Fritz probably does better extensions than Deeper blue because Deep Fritz
see big fail low at depth 16.

Deep fritz also can see another fail low for Rg8 at depth 22 when deeper blue
could get only depth 17 after similiar number of nodes.

I do not believe that you lose more than 2-3 plies from null move pruning(my
test suggest that you do not lose even 1 ply at small depthes so I guess that
Deep Fritz can search deeper because it is a better software.


kasparov - Deeper blue
4r3/8/2p2PPk/1p1r4/pP2p1R1/P1B5/2P2K2/8 b - - 0 1

Analysis by Deep Fritz:

44...e3+--
  =  (0.19)   Depth: 1/3   00:00:00
44...e3+-- 45.Ke2
  ±  (1.22)   Depth: 1/5   00:00:00
44...Rd1!
  ±  (1.00)   Depth: 1/5   00:00:00
44...Rd1--
  ±  (1.37)   Depth: 2/6   00:00:00
44...Rd1--
  ±  (1.37)   Depth: 2/6   00:00:00
44...Red8!
  ±  (1.28)   Depth: 2/7   00:00:00
44...Rg8!
  ±  (1.25)   Depth: 2/8   00:00:00
44...Rg8! 45.g7
  ²  (0.47)   Depth: 2/11   00:00:00
44...Rg8 45.g7 Rf5+ 46.Ke2
  ±  (0.72)   Depth: 3/14   00:00:00
44...Rg8 45.g7 Rf5+ 46.Ke2 Rf3
  ±  (0.75)   Depth: 4/12   00:00:00  2kN
44...Rg8 45.g7 Rf5+ 46.Ke2 Rf3 47.Bd2+ Kh7
  ±  (0.75)   Depth: 5/13   00:00:00  6kN
44...Rg8--
  ±  (1.06)   Depth: 6/14   00:00:00  14kN
44...Rg8-- 45.g7 Rh5 46.Rxe4 Rh2+ 47.Ke3 Rxc2
  +-  (1.53)   Depth: 6/17   00:00:00  21kN
44...Rf5+!
  +-  (1.50)   Depth: 6/18   00:00:00  37kN
44...e3+!
  +-  (1.47)   Depth: 6/18   00:00:00  45kN
44...e3+! 45.Ke2 Rh5 46.g7 Rh2+ 47.Kd3 Rd8+ 48.Bd4 e2
  ²  (0.66)   Depth: 6/18   00:00:00  53kN
44...e3+--
  ±  (0.97)   Depth: 7/20   00:00:00  65kN
44...e3+-- 45.Ke2 Rh5 46.g7 Rh2+ 47.Kd3 Rd8+ 48.Rd4 Rxd4+ 49.Kxd4 Kh7 50.Kxe3
  +-  (1.47)   Depth: 7/24   00:00:00  86kN
44...Rdd8!
  +-  (1.44)   Depth: 7/24   00:00:00  149kN
44...Rdd8! 45.f7 Rf8 46.Ke3 Kh5 47.Rg3 Rd6
  ±  (1.25)   Depth: 7/24   00:00:00  157kN
44...Rdd8--
  +-  (1.56)   Depth: 8/16   00:00:00  199kN
44...Rdd8-- 45.f7 Rf8 46.Ke3 Kh5 47.Rg2 Kh6 48.Kxe4
  +-  (2.56)   Depth: 8/18   00:00:00  221kN
44...e3+!
  +-  (2.53)   Depth: 8/24   00:00:00  273kN
44...e3+! 45.Ke2 Rf5 46.f7 Rf2+ 47.Kd3 Rd8+ 48.Kxe3 Rxc2
  +-  (2.03)   Depth: 8/24   00:00:00  335kN
44...Rd7!
  +-  (2.00)   Depth: 8/24   00:00:00  526kN
44...Rd7! 45.g7 e3+ 46.Kf3 Kh7 47.Rh4+ Kg6 48.Re4 Red8 49.Kxe3
  +-  (1.94)   Depth: 8/24   00:00:00  546kN
44...Red8!
  +-  (1.91)   Depth: 8/24   00:00:01  585kN
44...Red8! 45.g7 Kh7 46.Rxe4 Rh5 47.Kg3 Kg8 48.Re7
  +-  (1.87)   Depth: 8/24   00:00:01  602kN
44...Rg8!
  +-  (1.84)   Depth: 8/24   00:00:01  673kN
44...Kh5!
  +-  (1.81)   Depth: 8/24   00:00:01  694kN
44...Kh5--
  +-  (2.12)   Depth: 9/22   00:00:01  805kN
44...Kh5-- 45.f7 Rf8 46.Kg3 Rdd8 47.Bg7 e3
  +-  (2.50)   Depth: 9/22   00:00:01  890kN
44...Rg8!
  +-  (2.47)   Depth: 9/22   00:00:01  923kN
44...Rg8! 45.g7 Rf5+ 46.Ke2 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5
  +-  (1.91)   Depth: 9/22   00:00:01  1008kN
44...Rg8 45.g7 Rf5+ 46.Ke2 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5 50.Kd3
  +-  (2.00)   Depth: 10/23   00:00:02  1603kN
44...Kh5!
  +-  (1.97)   Depth: 10/27   00:00:03  2372kN
44...Kh5! 45.f7 Rf8 46.Kg3 Rdd8 47.Bg7 Rg8 48.fxg8Q
  +-  (1.81)   Depth: 10/27   00:00:03  2442kN
44...Kh5 45.f7 Rf8 46.g7 Rxf7+ 47.Ke2 Rd8 48.g8Q Rxg8 49.Rxg8 Rf3 50.Bb2
  +-  (1.87)   Depth: 11/25   00:00:04  2876kN
44...Kh5--
  +-  (2.19)   Depth: 12/29   00:00:06  4493kN
44...Kh5--
  +-  (2.19)   Depth: 12/29   00:00:06  4763kN
44...Rg8!
  +-  (2.16)   Depth: 12/29   00:00:07  5348kN
44...Rg8! 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Kh7 48.Bb2 Rf5 49.Ke3 Rf1 50.Rxe4
  +-  (2.03)   Depth: 12/29   00:00:09  6493kN
44...Rf5+!
  +-  (2.00)   Depth: 12/29   00:00:14  10023kN
44...Rf5+! 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.Re4 cxb4
  +-  (1.50)   Depth: 12/29   00:00:15  10790kN
44...Rf5+ 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.Re4 cxb4 50.Rxb4
  +-  (1.50)   Depth: 13/30   00:00:18  12983kN
44...Rf5+--
  +-  (1.81)   Depth: 14/35   00:00:27  19404kN
44...Rf5+-- 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5 50.Kd3
  +-  (1.84)   Depth: 14/35   00:00:50  36597kN
44...Rf5+ 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5 50.Kd3
  +-  (1.94)   Depth: 15/35   00:01:19  57957kN
44...Rf5+--
  +-  (2.25)   Depth: 16/37   00:03:15  142651kN
44...Rf5+-- 45.Ke3 Rf3+ 46.Ke2 Rg8 47.Bd2+ Kh5 48.Rg5+ Kh6 49.f7 Rd8 50.g7
  +-  (3.06)   Depth: 16/37   00:04:21  191728kN
44...Rg8!
  +-  (3.03)   Depth: 16/37   00:04:42  206715kN
44...Rg8! 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2
  +-  (2.25)   Depth: 16/37   00:06:07  267902kN
44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5 48.Bd4 e3 49.Kxe3
  +-  (2.50)   Depth: 17/38   00:08:43  382453kN
44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5
  +-  (2.50)   Depth: 18/41   00:18:37  809804kN, tb=1
44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5
  +-  (2.50)   Depth: 19/42   00:33:27  1472226kN, tb=6
44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5
  +-  (2.50)   Depth: 20/46   01:06:01  2917465kN, tb=52
44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5
  +-  (2.50)   Depth: 21/47   02:35:13  6867428kN, tb=222
44...Rg8--
  +-  (2.81)   Depth: 22/46   04:16:01  11410779kN, tb=435

(Blass, Tel-Aviv 06.05.2001)

Uri



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