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

Author: Karlo Bala

Date: 14:57:56 12/05/05


It is obvious that Rybka use some threat driving search, maybe B*. In this
position when you give extra ply to black, black doesn't threat anything.

Karlo Bala


FEN: 8/3N4/8/8/1pp5/brpp4/qpprp3/1nkbK3 w - - 3 13

Rybka 1.0 Beta 32-bit:
   3	00:00	           0	0	 0,00	Nd7c5
   4	00:00	           0	0	 0,00	Nd7c5
   5	00:00	           0	0	 0,00	Nd7c5
   6	00:00	           0	0	 0,00	Nd7c5
   7	00:00	           0	0	 0,00	Nd7c5
   8	00:00	          58	59.392	 0,00	Nd7c5
   9	00:00	         107	109.568	 0,00	Nd7c5
  10	00:00	         214	219.136	 0,00	Nd7c5
  11	00:00	         328	335.872	 0,00	Nd7c5
  12	00:00	         484	495.616	 0,00	Nd7c5
  13	00:00	         754	772.096	 0,00	Nd7c5
  14	00:00	       1.138	1.165.312	 0,00	Nd7c5
  15	00:00	       1.729	104.146	 0,00	Nd7c5
  16	00:00	       2.553	153.780	 0,00	Nd7c5 Qa2a1
  17	00:00	       3.628	218.533	 0,00	Nd7c5 Qa2a1
  18	00:00	       4.971	299.429	 0,00	Nd7c5 Qa2a1
  19	00:00	       6.735	215.520	 0,00	Nd7c5 Qa2a1
  20	00:00	       9.060	289.920	 0,00	Nd7c5 Qa2a1
  21	00:00	      12.004	256.085	 0,00	Nd7c5 Qa2a1
  22	00:00	      15.325	326.933	 0,00	Nd7c5 Qa2a1
  23	00:00	      19.051	304.816	 0,00	Nd7c5 Qa2a1
  24	00:00	      23.766	380.256	 0,00	Nd7c5 Qa2a1
  25	00:00	      30.166	391.012	 0,00	Nd7c5 Qa2a1
  26	00:00	      38.137	351.822	 0,00	Nd7c5 Qa2a1
  27	00:00	      48.079	260.491	 0,00	Nd7c5 Qa2a1
  28	00:00	      59.799	300.167	 0,00	Nd7c5 Qa2a1
  29	00:00	      73.679	229.323	 0,00	Nd7c5 Qa2a1
  30	00:00	      91.322	213.015	 0,00	Nd7c5 Qa2a1
  31	00:00	     113.736	218.920	 0,00	Nd7c5 Qa2a1
  32	00:00	     141.335	249.960	 0,00	Nd7c5 Qa2a1
  33	00:00	     174.592	272.119	 0,00	Nd7c5 Qa2a1
  34	00:01	     213.690	303.914	 0,00	Nd7c5 Qa2a1
  35	00:01	     259.954	327.018	 0,00	Nd7c5 Qa2a1
  36	00:01	     317.370	352.098	 0,00	Nd7c5 Qa2a1
  37	00:01	     387.677	384.671	 0,00	Nd7c5 Qa2a1
  38	00:01	     470.898	411.082	 0,00	Nd7c5 Qa2a1
  39	00:01	     568.022	432.456	 0,00	Nd7c5 Qa2a1
  40	00:01	     681.714	455.662	 0,00	Nd7c5 Qa2a1
  41	00:02	     817.594	482.267	 0,00	Nd7c5 Qa2a1
  42	00:02	     993.871	504.573	 0,00	Nd7c5 Qa2a1
  43	00:02	   1.195.713	525.723	 0,00	Nd7c5 Qa2a1
  44	00:02	   1.428.780	547.351	 0,00	Nd7c5 Qa2a1
  45	00:03	   1.706.368	564.562	 0,00	Nd7c5 Qa2a1
  46	00:03	   2.035.933	579.915	 0,00	Nd7c5 Qa2a1
  47	00:04	   2.433.438	594.853	 0,00	Nd7c5 Qa2a1
  48	00:05	   2.911.190	605.536	 0,00	Nd7c5 Qa2a1
  49	00:06	   3.472.940	615.062	 0,00	Nd7c5 Qa2a1
  50	00:07	   4.162.795	625.579	 0,00	Nd7c5 Qa2a1
  51	00:08	   4.960.768	97.522	 0,00	Nd7c5 Qa2a1
  52	00:10	   5.912.534	656.948	 0,00	Nd7c5 Qa2a1
  53	00:12	   7.050.291	640.935	 0,00	Nd7c5 Qa2a1
  54	00:14	   8.406.514	600.465	 0,00	Nd7c5 Qa2a1
  55	00:17	  10.038.265	627.391	 0,00	Nd7c5 Qa2a1
  56	00:22	  12.237.221	556.237	 0,00	Nd7c5 Qa2a1
  57	00:28	  14.650.461	542.609	 0,00	Nd7c5 Qa2a1
  58	00:33	  17.576.485	549.265	 0,00	Nd7c5 Qa2a1
  59	00:39	  20.906.233	550.164	 0,00	Nd7c5 Qa2a1
  60	00:48	  25.071.646	533.439	 0,00	Nd7c5 Qa2a1
  61	01:03	  32.893.512	530.540	 0,00	Nd7c5 Qa2a1
  62	01:30	  47.221.106	536.603	 0,00	Nd7c5 Qa2a1
  63	01:48	  56.730.098	540.286	 0,00	Nd7c5 Qa2a1
  64	01:59	  62.369.615	537.669	 0,00	Nd7c5 Qa2a1
  65	02:18	  73.324.246	543.142	 0,00	Nd7c5 Qa2a1

Re: Rybka is not perfect! It doesn't see mate in 4! Pedro Castro 23:40:30 12/06/05
Re: Rybka is not perfect! It doesn't see mate in 4! Pedro Castro 23:10:08 12/06/05
- Re: Rybka is not perfect! It doesn't see mate in 4! Pedro Castro 23:14:31 12/06/05
Nor does any Fritz until F9, any Junior, ChessTiger, Ktulu, Gandalf..N/T Ed Murak 17:51:48 12/05/05
Re: Rybka is not perfect! It doesn't see mate in 4! Martin Giepmans 16:14:46 12/05/05
- Re: Rybka is not perfect! It doesn't see mate in 4! Reinhard Scharnagl 04:46:17 12/06/05
- Re: Rybka is not perfect! It doesn't see mate in 4! Alessandro Scotti 23:38:46 12/05/05
- Re: Rybka is not perfect! It doesn't see mate in 4! Uri Blass 18:44:19 12/05/05
  - Re: Rybka is not perfect! It doesn't see mate in 4! Martin Giepmans 02:54:05 12/06/05
- Re: Rybka is not perfect! It doesn't see mate in 4! Joseph Tadeusz 17:47:17 12/05/05
  - Re: Rybka is not perfect! It doesn't see mate in 4! Richard Pijl 02:26:21 12/06/05
- Re: Rybka is not perfect! It doesn't see mate in 4! Mark Rawlings 16:49:37 12/05/05

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