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Subject: Re: Rybka is not perfect! It doesn't see mate in 4!

Author: Pedro Castro

Date: 23:40:30 12/06/05

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DanaSah solves the mate, the conditions of the null move impede that this it is
made. But another private engine with the same conditions of null move doesn't
solve it.

FEN: 8/8/1N6/8/1pp5/brpp4/qpprp3/1nkbK3 b - - 1 1

DanaSah v1.7p:
   1	00:00	           3	3	-41,79	Cf6
   1	00:00	           7	7	-41,76	Cc5
   1	00:00	          11	11	-41,73	Ce5
   2	00:00	          33	33	-41,58	Ce5
   2	00:00	          38	38	-41,57	Cc5
   2	00:00	          43	43	-41,56	Cf6
   2	00:00	          48	48	-41,55	Cb6
   2	00:00	          53	53	-41,54	Cf8
   2	00:00	          58	58	-41,53	Cb8
   2	00:00	          75	75	-41,52	Rf2
   2	00:00	          91	91	-40,02	Rf2
   2	00:00	          96	96	-40,01	Cc5
   2	00:00	         101	101	-40,00	Ce5
   2	00:00	         106	106	-39,99	Cf6
   2	00:00	         111	111	-39,98	Cb6
   2	00:00	         116	116	-39,97	Cb8
   2	00:00	         121	121	-39,96	Cf8
   2	00:00	         125	125	-41,80	Cf8 Da1
   2	00:00	         137	137	-36,69	Cc5 Da1 Cxb3+
   3	00:00	         199	199	-36,54	Cc5
   3	00:00	         204	204	-36,53	Cf8
   3	00:00	         216	216	-35,03	Cf8
   3	00:00	         221	221	-35,02	Cc5
   3	00:00	         270	270	-40,28	Cc5 Da1 Cxb3+ cxb3
   3	00:00	         289	289	-39,24	Ce5 Da1 Cxd3+
   4	00:00	         343	343	-39,09	Ce5
   4	00:00	         350	350	-39,08	Cc5
   4	00:00	         352	352	-39,07	Cf8
   4	00:00	         360	360	-39,06	Cf6
   4	00:00	         448	448	-39,05	Rf2
   4	00:00	         454	454	-39,04	Cb6
   4	00:00	         462	462	-39,03	Cb8
   4	00:00	         482	482	-37,53	Cb8
   4	00:00	         489	489	-37,52	Cc5
   4	00:00	         493	493	-37,51	Cf8
   4	00:00	         581	581	-37,50	Rf2
   4	00:00	         590	590	-37,49	Ce5
   4	00:00	         598	598	-37,48	Cf6
   4	00:00	         604	604	-37,47	Cb6
   4	00:00	         688	688	-34,70	Cb6 Da1 Cxc4 Da2 Cxd2
   5	00:00	         919	919	-34,55	Cb6
   5	00:00	         929	929	-34,54	Cc5
   5	00:00	         996	996	-34,53	Cf8
   5	00:00	       1.009	1.009	-34,52	Ce5
   5	00:00	       1.030	1.030	-34,51	Cf6
   5	00:00	       1.051	1.051	-34,50	Cb8
   5	00:00	       1.183	1.183	-33,00	Cc5
   5	00:00	       1.197	1.197	-32,99	Cb6
   5	00:00	       1.209	1.209	-32,98	Ce5
   5	00:00	       1.311	1.311	-34,70	Ce5 Da1 Cxc4 Da2 Cxd2
   6	00:00	       1.447	1.447	-34,55	Ce5
   6	00:00	       1.470	1.470	-34,54	Cc5
   6	00:00	       1.501	1.501	-34,53	Cb6
   6	00:00	       1.591	1.591	-34,52	Cf8
   6	00:00	       1.681	1.681	-34,51	Cf6
   6	00:00	       1.722	1.722	-33,01	Cf6
   6	00:00	       1.748	1.748	-33,00	Cc5
   6	00:00	       1.766	1.766	-32,99	Ce5
   6	00:00	       1.781	1.781	-32,98	Cb6
   6	00:00	       1.977	1.977	 0,00	Cb6 Da1 Cd7 Da2
   7	00:00	       2.009	2.009	+0,15	Cb6
   7	00:00	       2.112	2.112	+1,65	Cb6
   7	00:00	       2.247	2.247	+M4	Cb6 Da1 Cxc4 Da2 Ca5 Da1 Cxb3+



FEN: 8/3N4/8/8/1pp5/brpp4/qpprp3/1nkbK3 w - - 0 1

Private engine:
   1	00:00	           3	3	-42,04	Cf6
   1	00:00	           7	7	-42,01	Cc5
   1	00:00	          11	11	-41,98	Ce5
   2	00:00	          50	50	-39,55	Ce5 Da1 Cxd3+
   2	00:00	          61	61	-37,02	Cc5 Da1 Cxb3+
   3	00:00	         321	321	-40,52	Cc5 Da1 Cxb3+ cxb3
   3	00:00	         366	366	-39,99	Ce5 Da1 Cxc4
   3	00:00	         415	415	-39,84	Rf2 e1D+ Rxe1
   4	00:00	         579	579	 0,00	Cc5 Da1 Cd7 Da2
   5	00:00	         728	728	 0,00	Cc5 Da1 Cd7 Da2
   6	00:00	         923	923	 0,00	Cc5 Da1 Cd7 Da2
   7	00:00	       1.068	35.600	 0,00	Cf6 Da1 Cd7 Da2
   8	00:00	       1.267	42.233	 0,00	Cb8 Da1 Cd7 Da2
   9	00:00	       1.834	61.133	 0,00	Cb8 Da1 Cd7 Da2
  10	00:00	       2.222	74.066	 0,00	Cf8 Da1 Cd7 Da2
  11	00:00	       2.731	91.033	 0,00	Cb6 Da1 Cd7 Da2
  12	00:00	       3.304	66.080	 0,00	Cb6 Da1 Cd7 Da2
  13	00:00	       4.065	67.750	 0,00	Cb6 Da1 Cd7 Da2
  14	00:00	       4.573	76.216	 0,00	Cb6 Da1 Cd7 Da2
  15	00:00	       5.752	82.171	 0,00	Cb6 Da1 Cd7 Da2
  16	00:00	       7.544	107.771	 0,00	Cb6 Da1 Cd7 Da2
  17	00:00	       8.681	108.512	 0,00	Cb6 Da1 Cd7 Da2
  18	00:00	      10.514	116.822	 0,00	Cb6 Da1 Cd7 Da2
  19	00:00	      11.454	127.266	 0,00	Cb6 Da1 Cd7 Da2
  20	00:00	      13.392	133.920	 0,00	Cb6 Da1 Cd7 Da2
  21	00:00	      15.445	140.409	 0,00	Cb6 Da1 Cd7 Da2
  22	00:00	      17.139	142.825	 0,00	Cb6 Da1 Cd7 Da2
  23	00:00	      19.383	161.525	 0,00	Cb6 Da1 Cd7 Da2
  24	00:00	      22.052	169.630	 0,00	Cb6 Da1 Cd7 Da2
  25	00:00	      24.854	177.528	 0,00	Cb6 Da1 Cd7 Da2
  26	00:00	      28.286	176.787	 0,00	Cb6 Da1 Cd7 Da2
  27	00:00	      32.502	191.188	 0,00	Cb6 Da1 Cd7 Da2
  28	00:00	      41.100	228.333	 0,00	Cb6 Da1 Cd7 Da2
  29	00:00	      48.918	244.590	 0,00	Cb6 Da1 Cd7 Da2
  30	00:00	      55.734	265.400	 0,00	Cb6 Da1 Cd7 Da2
  31	00:00	      66.238	301.081	 0,00	Cb6 Da1 Cd7 Da2
  32	00:00	      75.320	313.833	 0,00	Cb6 Da1 Cd7 Da2
  33	00:00	      85.606	342.424	 0,00	Cb6 Da1 Cd7 Da2
  34	00:00	      93.812	347.451	 0,00	Cb6 Da1 Cd7 Da2
  35	00:00	     107.255	383.053	 0,00	Cb6 Da1 Cd7 Da2
  36	00:00	     123.218	410.726	 0,00	Cb6 Da1 Cd7 Da2
  37	00:00	     137.940	431.062	 0,00	Cb6 Da1 Cd7 Da2
  38	00:00	     167.295	492.044	 0,00	Cb6 Da1 Cd7 Da2
  39	00:00	     226.225	595.328	 0,00	Cb6 Da1 Cd7 Da2
  40	00:00	     277.628	661.019	 0,00	Cb6 Da1 Cd7 Da2
  41	00:00	     347.728	755.930	 0,00	Cb6 Da1 Cd7 Da2
  42	00:00	     438.128	842.553	 0,00	Cb6 Da1 Cd7 Da2
  43	00:00	     505.626	887.063	 0,00	Cb6 Da1 Cd7 Da2
  44	00:00	     594.456	943.580	 0,00	Cb6 Da1 Cd7 Da2
  45	00:00	     673.696	976.371	 0,00	Cb6 Da1 Cd7 Da2
  46	00:00	     768.918	1.025.224	 0,00	Cb6 Da1 Cd7 Da2
  47	00:00	     874.490	1.053.602	 0,00	Cb6 Da1 Cd7 Da2
  48	00:00	     999.706	1.098.578	 0,00	Cb6 Da1 Cd7 Da2
  49	00:00	   1.238.796	1.202.714	 0,00	Cb6 Da1 Cd7 Da2
  50	00:01	   1.659.633	1.317.169	 0,00	Cb6 Da1 Cd7 Da2
  51	00:01	   2.187.573	1.393.358	 0,00	Cb6 Da1 Cd7 Da2
  52	00:01	   2.883.440	1.463.675	 0,00	Cb6 Da1 Cd7 Da2
  53	00:02	   3.594.908	1.497.878	 0,00	Cb6 Da1 Cd7 Da2
  54	00:02	   4.273.960	1.526.414	 0,00	Cb6 Da1 Cd7 Da2
  55	00:03	   5.000.876	1.548.258	 0,00	Cb6 Da1 Cd7 Da2
  56	00:03	   5.777.968	1.561.612	 0,00	Cb6 Da1 Cd7 Da2
  57	00:04	   6.597.673	1.559.733	 0,00	Cb6 Da1 Cd7 Da2
  58	00:04	   7.494.710	1.584.505	 0,00	Cb6 Da1 Cd7 Da2
  59	00:05	   8.711.232	1.665.627	 0,00	Cb6 Da1 Cd7 Da2
  60	00:06	  10.981.660	1.692.089	 0,00	Cb6 Da1 Cd7 Da2
  61	00:08	  15.177.305	1.787.668	 0,00	Cb6 Da1 Cd7 Da2
  62	00:11	  21.089.114	1.796.347	 0,00	Cb6 Da1 Cd7 Da2
  63	00:15	  28.080.101	1.872.006	 0,00	Cb6 Da1 Cd7 Da2
  64	00:19	  35.075.072	1.846.056	 0,00	Cb6 Da1 Cd7 Da2




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