Author: Frederic Friedel
Date: 17:59:52 01/26/00
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I checked this position with my Fritz 6, running on a 450 MHz PII with 64 MB hashtables. As you can see in the first protocol below (captured by right-clicking the analysis window and selecting "Clip analysis") the program finds 1.Nxg5 in 2 min. 31 sec. at 11/36 ply. If I turn up the aggressiveness from zero to two (by clicking the engine name and using "engine parameters") then the program find the move in 14 seconds at a depth of 9/32 (second protocol). If I switch the null-move function off (by using "engine parameters" to set the selectivity from its default 2 to zero) Fritz doesn't find the move in 14 minutes (protocol 3). Analysis by Fritz 6 -- protocol 1 ================================= [First eight ply cut] 1.Bf2-- ² (0.59) depth: 9/28 00:00:01 341kN 1.Bf2 g4 2.g3 Bxg3 3.hxg3 Nxg3 4.Bxg3 Qxg3+ 5.Kh1 gxf3 ² (0.53) depth: 9/28 00:00:01 542kN 1.g3 ² (0.56) depth: 9/30 00:00:05 1804kN 1.g3 Bxe3+ 2.Qxe3 Qb6 3.Nd4 Ng7 4.Bxg5 hxg5 5.Qxg5 e5 ± (0.75) depth: 9/33 00:00:07 2649kN 1.g3 Bh3 2.Ng2 gxh4 3.gxf4 Nxf4 4.Qe4 Qb6+ 5.Nd4 Nxd3 ± (0.88) depth: 10/36 00:00:30 10549kN 1.g3 Bxe3+ 2.Qxe3 Qb6 3.Nd4 e5 4.Bxg5 hxg5 5.Qxg5+ Ng7 ± (0.78) depth: 11/36 00:01:08 24400kN 1.Be1 ± (0.81) depth: 11/36 00:01:37 33866kN 1.Be1 g4 2.Nh4 Bxh2+ 3.Kh1 Nf4 4.Qf2 e6 5.Bh7+ Kxh7 ± (1.22) depth: 11/36 00:02:05 43248kN 1.Nxg5 ± (1.25) depth: 11/36 00:02:31 52063kN 1.Nxg5 Bxh2+ 2.Kh1 Nf4 3.Nxf7 Nxe2 4.Nxh6+ Kh8 5.Rf7 Bf5 +- (1.47) depth: 11/36 00:02:47 57590kN 1.Nxg5! +- (1.78) depth: 12/34 00:03:49 79170kN 1.Nxg5! Bxh2+ 2.Kh1 Nf4 3.Nxf7 Kg7 4.Qd2 Rf8 5.Kxh2 Rxf7 +- (2.72) depth: 12/34 00:05:34 114549kN 1.Nxg5 Nf6 2.Nf3 Qd6 3.Nf5 Bxf5 4.Bxf5 Rad8 5.Rad1 Nd5 +- (2.94) depth: 13/38 00:10:55 225004kN Analysis by Fritz 6 -- protocol 2 ================================= 1.g4 Bxe3+ 2.Qxe3 Qf4 3.Bf2 Qxg4+ 4.Kh1 Nf4 5.Rg1 Qh5 ± (1.00) depth: 8/25 00:00:01 415kN 1.g4-- ² (0.69) depth: 9/29 00:00:04 1257kN 1.g4 Nf6 2.Be1 e5 3.Bf5 Bxe3+ 4.Qxe3 Bxf5 5.gxf5 Qb6 ² (0.66) depth: 9/29 00:00:04 1449kN 1.g3 ² (0.69) depth: 9/32 00:00:10 3294kN 1.g3 Bxe3+ 2.Qxe3 Qb6 3.Nd4 Ng7 4.Bxg5 hxg5 5.Qxg5 e5 ± (0.75) depth: 9/32 00:00:11 3803kN 1.Nxg5 ± (0.78) depth: 9/32 00:00:14 4784kN 1.Nxg5 Bxh2+ 2.Kh1 Nf4 3.Nxf7 Nxe2 4.Nxh6+ Kh8 5.Rf7 Bf5 +- (1.50) depth: 9/32 00:00:18 6293kN 1.Nxg5! +- (1.81) depth: 10/29 00:00:25 8477kN 1.Nxg5! Bxh2+ 2.Kh1 Nf4 3.Nxf7 Kg7 4.Qd2 Nxd3 5.Qxd3 Bf4 +- (2.47) depth: 10/30 00:00:34 11732kN 1.Nxg5 Bxh2+ 2.Kh1 Nf4 3.Nxf7 Kg7 4.Qd2 Nxd3 5.Qxd3 Bf4 +- (2.72) depth: 11/32 00:01:03 21698kN Analysis by Fritz 6 -- protocol 3 ================================= 1.Bf2 g4 2.g3 gxf3 3.Qxf3 Bxe3 4.Bxe3 Nf6 5.Bxb5 ± (0.91) depth: 8/27 00:00:06 1967kN 1.Bf2-- ² (0.59) depth: 9/26 00:00:17 5737kN 1.Bf2 g4 2.g3 Bxg3 3.hxg3 Nxg3 4.Bxg3 Qxg3+ 5.Kh1 gxf3 ² (0.53) depth: 9/31 00:00:29 9144kN 1.g4 ² (0.56) depth: 9/31 00:00:38 11664kN 1.Be1 ² (0.59) depth: 9/31 00:00:58 17483kN 1.Be1 g4 2.Nh4 Bxh2+ 3.Kh1 Nf4 4.Qf2 e5 5.Bxb5 cxb5 ± (0.91) depth: 9/31 00:01:12 21502kN 1.Be1 g4 2.Nh4 Bxh2+ 3.Kh1 Nf4 4.Qf2 e6 5.Bc2 Nh5 ± (0.88) depth: 10/33 00:03:09 56845kN 1.Be1! ± (1.19) depth: 11/39 00:14:32 261770kN
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