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Subject: Re: testposition.

Author: Martin Baumung

Date: 01:19:17 12/09/04

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Hi Eduard,

obviously many of the so called "top engines" have problems with draws by
perpetual check.

Here's another position where most engines show some fantastic scores around
-30.00. Not from a game though...

[D]b2b3R/1np2pp1/Np6/n2K4/p7/N1k2p2/P1p3p1/2B2rqr w - - 0 1

Only YACE managed to give an appropriate score so far.

FEN: b2b3R/1np2pp1/Np6/n2K4/p7/N1k2p2/P1p3p1/2B2rqr w - - 0 1

Yace 0.99.87:
   1	00:00	          10	0	-34,43	1.Th8xh1 g2xh1D
   1	00:00	          19	0	-30,50	1.Th8xd8 Sb7xd8+ 2.Kd5e5 Tf1xc1 3.Sa6xc7
   1	00:00	          27	0	-30,06	1.Sa3xc2 Th1xh8
   1+	00:00	          72	72.000	-26,72	1.Sa3b5+ Kc3d3
   1	00:00	          84	84.000	-25,39	1.Sa3b5+ Kc3d3
   1	00:00	         119	119.000	-25,39	1.Sa3b5+ Kc3d3
   2	00:00	         344	172.000	-25,12	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Th8e8+
Ke2d1
   2	00:00	         771	257.000	-25,12	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Th8e8+
Ke2d1
   3	00:00	       1.848	264.000	-24,86	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3
   3	00:00	       3.023	81.702	-24,86	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3
   4	00:00	       6.658	114.793	-24,51	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sc3e4+ Kf2e1 5.Sb4xc2+ Ke1e2 6.Se4c3+ Ke2d3
   4	00:00	       7.333	114.578	-24,51	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sc3e4+ Kf2e1 5.Sb4xc2+ Ke1e2 6.Se4c3+ Ke2d3
   5	00:00	      15.229	169.211	-24,68	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sc3e4+ Kf2e1 5.Sb4xc2+ Ke1d1 6.Lc1e3 f3f2
   5	00:00	      17.640	174.653	-24,68	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sc3e4+ Kf2e1 5.Sb4xc2+ Ke1d1 6.Lc1e3 f3f2
  6/32-	00:01	     695.694	565.604	-25,08	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sc3e4+ Kf2e1 5.Sb4xc2+ Ke1d1 6.Se4c3+ Kd1xc1 7.Th8xh1 g2xh1D 8.Sc3xa4
  6/33	00:02	   1.192.183	582.689	-25,20	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5c6+ Sa5xc6
  6/33	00:02	   1.206.199	577.958	-25,20	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5c6+ Sa5xc6
  7/35	00:05	   3.251.938	594.286	-25,52	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5c6+ Sa5xc6 13.Se7xc6+ Kb8c8
14.Sc6e7+ Kc8d7
  7/35	00:05	   3.292.346	592.042	-25,52	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5c6+ Sa5xc6 13.Se7xc6+ Kb8c8
14.Sc6e7+ Kc8d7
  8/40+	00:06	   3.443.824	592.027	 0,00	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5d7+ Kb8a7 13.Se7c8+ Ka7a6
14.Sd7b8+ Ka6b5 15.Sc8a7+ Kb5b4 16.Sb8a6+ Kb4c3 17.Sa7b5+
  8/45	00:08	   5.525.578	678.401	 0,00	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5d7+ Kb8a7 13.Se7c8+ Ka7a6
14.Sd7b8+ Ka6b5 15.Sc8a7+ Kb5b4 16.Sb8a6+ Kb4c3 17.Sa7b5+ Kc3d3 18.Sa6b4+ Kd3e2
19.Sb5c3+ Ke2f2 20.Sb4d3+ Kf2g3 21.Sc3e4+ Kg3g4 22.Sd3e5+ Kg4f5 23.Se4g3+ Kf5f6
24.Se5g4+ Kf6e7 25.Sg3f5+ Ke7d7 26.Sg4e5+ Kd7c8 27.Sf5e7+ Kc8b8 28.Se5d7+ Kb8a7
29.Se7c8+ Ka7a6 30.Sd7b8+ Ka6b5 31.Sc8a7+ Kb5b4 32.Sb8a6+ Kb4c3 33.Sa7b5+
  8/45	00:08	   5.578.044	678.016	 0,00	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5d7+ Kb8a7 13.Se7c8+ Ka7a6
14.Sd7b8+ Ka6b5 15.Sc8a7+ Kb5b4 16.Sb8a6+ Kb4c3 17.Sa7b5+ Kc3d3 18.Sa6b4+ Kd3e2
19.Sb5c3+ Ke2f2 20.Sb4d3+ Kf2g3 21.Sc3e4+ Kg3g4 22.Sd3e5+ Kg4f5 23.Se4g3+ Kf5f6
24.Se5g4+ Kf6e7 25.Sg3f5+ Ke7d7 26.Sg4e5+ Kd7c8 27.Sf5e7+ Kc8b8 28.Se5d7+ Kb8a7
29.Se7c8+ Ka7a6 30.Sd7b8+ Ka6b5 31.Sc8a7+ Kb5b4 32.Sb8a6+ Kb4c3 33.Sa7b5+
  9/45	00:13	  10.215.071	753.212	 0,00	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5d7+ Kb8a7 13.Se7c8+ Ka7a6
14.Sd7b8+ Ka6b5 15.Sc8a7+ Kb5b4 16.Sb8a6+ Kb4c3 17.Sa7b5+
  9/45	00:13	  10.304.933	752.789	 0,00	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5d7+ Kb8a7 13.Se7c8+ Ka7a6
14.Sd7b8+ Ka6b5 15.Sc8a7+ Kb5b4 16.Sb8a6+ Kb4c3 17.Sa7b5+
  9/45	00:14	  10.544.552	750.288	 0,00	1.Sa3b5+ Kc3d3 2.Sa6b4+ Kd3e2 3.Sb5c3+
Ke2f2 4.Sb4d3+ Kf2g3 5.Sc3e4+ Kg3g4 6.Sd3e5+ Kg4f5 7.Se4g3+ Kf5f6 8.Se5g4+ Kf6e7
9.Sg3f5+ Ke7d7 10.Sg4e5+ Kd7c8 11.Sf5e7+ Kc8b8 12.Se5d7+ Kb8a7 13.Se7c8+ Ka7a6
14.Sd7b8+ Ka6b5 15.Sc8a7+ Kb5b4 16.Sb8a6+ Kb4c3 17.Sa7b5+

Regards,

Martin





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