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Subject: Re: Very Tough Mate in 4 for Some Engines

Author: Djordje Vidanovic

Date: 08:16:48 03/28/03

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Ruffian 1.0.5 is fast, but it finds mate in 11 in about 9 seconds.  However
Shredder 7.04 is very fast, as fast as one can be. Quite impressive.  See the
analyses of both programs below (Shredder 6 Classic GUI):

Engine: Ruffian 1.0.5
by Perola Valfridsson

 14.00	 0:01 	+11.39--	1.Ne3 (1.733.736) 1520.8
 14.01	 0:01 	+12.02	1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kxh4 4.Nxg4 e3 5.Nxe3 g4 6.Bxg4
g5 7.Be2 g4 8.Bxg4 (1.750.489) 1535.5
 15.01	 0:02 	+11.67--	1.Ne3 (3.278.002) 1510.6
 15.01	 0:03 	+11.35	1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kxh4 4.Nxg4 e3 5.Rd4 Kh5 6.Ne5+
g4 7.Nxf7 g5 8.Nxd6 Kg6 9.f7 Kg7 (4.837.722) 1516.5
 16.01	 0:03 	+11.70++	1.Ne3 (5.974.859) 1524.1
 16.01	 0:05 	+12.09	1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kxh4 4.Nxg4 e3 5.Rd4 Kh5 6.Ne5+
g4 7.Nxf7 g5 8.Nxd6 Kg6 9.f7 Kg7 10.Rxg4 (8.563.067) 1512.9
 17.01	 0:07 	+12.44++	1.Ne3 (10.487.605) 1493.9
 17.01	 0:09 	  +M11	1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 5.hxg5 e3
6.Rxd6 Kg8 7.Nh6+ Kh8 8.Nxf7+ Kh7 9.Rd7 Kg8 10.Rd8+ Kxf7 11.Bc4+ (14.007.253)
1501.3
 18.01	 0:14 	  +M11	1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 5.hxg5 e3
6.Rxd6 Kg8 7.Nh6+ Kh8 8.Nxf7+ Kh7 9.Rd7 Kg8 10.Rd8+ Kxf7 11.Bc4+ (21.293.749)
1494.2
 19.01	 0:22 	  +M11	1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 5.hxg5 e3
6.Rxd6 Kg8 7.Nh6+ Kh8 8.Nxf7+ Kh7 9.Rd7 Kg8 10.Rd8+ Kxf7 11.Bc4+ (32.791.161)
1479.0
 20.01	 0:34 	  +M11	1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 5.hxg5 e3
6.Rxd6 Kg8 7.Nh6+ Kh8 8.Nxf7+ Kh7 9.Rd7 Kg8 10.Rd8+ Kxf7 11.Bc4+ (50.166.377)
1461.2
best move: Nd1-e3 time: 0:42.469 min  n/s: 1.469.329  CPU 98.0%  nodes:
62.402.413 TB: 3


Engine: Shredder 7.04
by Stefan Meyer-Kahlen

  8.05	 0:00 	  +M4 	1.Nc3 d6 2.Bd1 e3 3.Ne2 Rxg3 4.Nxg3+ (81.235) 324.9
best move: Nd1-c3 time: 0:00.250 min  n/s: 325.132  CPU 81.2%  nodes: 81.283



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