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Up Topic Rybka Support & Discussion / Rybka Discussion / Rybka don't find this
- - By albertfrank Date 2007-08-04 07:45
Hello,

In the following position, without tablebase:

White (to move) Kg7, Rb1; h7
Black Ke6, Ra8; e4

Rybka does not find (2 hours, 1 G° RAM) the wining move Rb5, but is still on h8Q (drawing).

I would like to know why, thanks!
Parent - - By siam (**) Date 2007-08-05 10:07
i'm not sure which rybka you use but without tablebase it finds this (2.3.2a)

UCI_AnalyseMode set to true
11.02   0:01   +2.72   1.Rf1 Ke5 2.Ra1 Rb8 3.Rb1 Ra8 4.h8Q Rxh8 5.Kxh8 e3 (105.900) 86
11.15   0:01   +3.72   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 e3 4.h8Q Rxh8 5.Rxh8 Ke5 6.Kg5 (125.131) 85
12.01   0:01   +3.83   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Ra8 5.h8Q Rxh8 6.Rxh8 Ke5 (136.049) 83
13.01   0:01   +3.84   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Ra8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Ra5 (141.779) 82
14.01   0:01   +3.84   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Ra8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Ra5 e3 (152.022) 82
15.01   0:02   +5.11   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Ra5 e3 (177.960) 82
16.01   0:03   +5.72   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Ra5 e3 (292.873) 79
17.01   0:08   +5.85   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Kh7 e3 (610.391) 76
18.01   0:21   +5.94   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Kh7 e3 (1.770.331) 84
19.01   0:47   +5.97   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Kh7 e3 (4.153.892) 88
20.01   1:36   +6.01   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Kh7 e3 (8.636.992) 91
21.01   3:43   +6.04   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Kh7 e3 (21.030.659) 96
22.01   7:50   +6.09   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Rb8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Kh7 e3 (44.220.668) 96
23.01  20:43   +6.13   1.Rb5 Ra7+ 2.Kg6 Ra8 3.Rh5 Rh8 4.Kg7 Ra8 5.h8Q Rxh8 6.Kxh8 Kf6 7.Kh7 e3 (122.585.002) 100
Parent - By sylvain.renard.27 (**) Date 2007-08-07 21:25
Even better :)

Engine: Rybka 2.3.2a 32-bit (512 MB)
by Vasik Rajlich

UCI_AnalyseMode set to true
  5.00   0:00     +M23  1.Rb5 (22) 0  TB:113

Statistics show that most useful 6-men tablebases are : krpkrp (3,35 Gb) ; krppkr (4,35 Gb) and kppkpp (0,97 Gb).
If you don't have a lot of disk space, get these ones. You can add kpppkp (only 0,96 Gb but not very useful).
Parent - - By siam (**) Date 2007-08-05 10:08
r7/6KP/4k3/8/4p3/8/8/1R6 w - -
Parent - - By albertfrank Date 2007-08-07 20:56
Thanks! I probably did not set something properly (It was Rybka 2.2)
Parent - By genorb (**) Date 2007-08-07 21:24
Yes there is something strange. I tried with Rybka 2.2 and I got those results

Without tablebases

  2.00   0:00   +2.74   1.h8D (289) 17
  3.00   0:00   +2.51   1.h8D (379) 22
  4.00   0:00   +4.06   1.h8D (791) 47
  5.00   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 (1.152) 36
  6.00   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 (1.842) 58
  7.00   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 (3.207) 68
  8.00   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Re5 (5.505) 88
  9.00   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Re5 5.Rg8 (9.424) 101
10.01   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Re5 5.Rg8 Rd5 (15.159) 109
11.01   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Re5 5.Rg8 Rd5 6.Tb5+ Rc4 (25.097) 116
12.01   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Re5 5.Rg8 Rd5 6.Tb5+ Rc4 7.Tb1 (37.480) 122
13.01   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Re5 5.Rg8 Rd5 6.Tb5+ Rc4 7.Tb1 e3 (53.193) 124
14.01   0:00   +4.06   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Re5 5.Rg8 Rd5 6.Tb5+ Rc4 7.Tb1 e3 (75.206) 126
15.01   0:01   +0.10   1.h8D Txh8 2.Rxh8 Rf5 3.Tb5+ Rf4 4.Tb4 Rf3 5.Tb7 e3 6.Tf7+ Rg2 7.Tg7+ Rf2 (182.736) 137
15.02   0:09   +0.14   1.Tb6+ Rd5 2.Tb3 Rd4 3.Ta3 Te8 4.Ta4+ Re5 5.h8D Txh8 (1.087.335) 112
15.05   0:10   +3.68   1.Ta1 Txa1 2.h8D Tg1+ 3.Rf8 Rd5 4.Dh5+ Rd4 5.Dh3 e3 6.Dd7+ Rc3 7.Dc8+ Rd3 (1.175.198) 113
15.15   0:11   +4.06   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Txh8 Rd5 (1.255.589) 113
16.01   0:11   +4.06   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Txh8 Rd5 (1.282.990) 113
17.01   0:11   +4.06   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Txh8 Rd5 (1.321.659) 113
18.01   0:12   +4.06   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Txh8 Re5 (1.391.972) 113
19.01   0:14   +4.92   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Rxh8 Rd6 (1.587.348) 113
20.01   0:15   +4.92   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Rxh8 Rd6 (1.725.079) 113
21.01   0:17   +4.92   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Rxh8 Rd6 (1.915.150) 113
22.01   0:20   +4.92   1.Tb5 Ta7+ 2.Rh6 Ta8 3.Rg6 Tc8 4.Th5 Th8 5.Rg7 Ta8 6.h8D Txh8 7.Rxh8 Rd6 (2.240.291) 113

With tablebases (set to rarely)

  2.00   0:00   +2.74   1.h8D (289) 295
  3.00   0:00   +2.51   1.h8D (379) 388
  4.00   0:00   +4.06   1.h8D (791) 809
  5.00   0:00   +4.06   1.h8D Txh8 2.Tb6+ Rd5 (984) 59
  6.00   0:00   +4.06   1.h8D Txh8 2.Tb6+ Rd5 3.Rxh8 (1.405) 84
  7.00   0:00    0.00   1.h8D Txh8 2.Tb6+ Rd5 3.Rxh8 (1.587) 49
  7.00   0:00   +3.88   1.Tb6+ Rd5 2.Tb5+ Rc6 3.Tb2 Ta7+ 4.Rg6 (9.942) 80
  7.00   0:00   +4.06   1.Th1 e3 2.Th5 Ta7+ 3.Rg6 (12.487) 73  TB:1
  8.00   0:00   +4.06   1.Th1 e3 2.Th5 Ta7+ 3.Rg6 Ta8 (13.607) 73  TB:1
  9.00   0:00   +4.06   1.Th1 e3 2.Th5 Ta7+ 3.Rg6 Ta8 4.h8D (17.758) 77  TB:2
10.01   0:00   +4.06   1.Th1 Rd5 2.Th5+ Rd4 3.Th2 Ta7+ 4.Rg6 Ta6+ 5.Rf5 Ta8 (56.484) 78  TB:12
11.01   0:01   +4.06   1.Th1 Rd5 2.Th5+ Rd4 3.Tf5 e3 4.Tf8 Ta7+ 5.Rg8 Txh7 (102.657) 86  TB:19
12.01   0:01   +4.06   1.Th1 Rd5 2.Tf1 Ta7+ 3.Tf7 Ta8 4.Tf8 Ta7+ 5.Rg6 Txh7 6.Td8+ Re5 (146.525) 86  TB:28
13.01   0:04   +4.06   1.Th1 Rd5 2.Td1+ Re5 3.Tf1 e3 4.Tf8 Ta7+ 5.Rg8 Txh7 6.Te8+ Rd4 7.Rxh7 (373.319) 90  TB:45
13.15   0:04   +5.77   1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 e3 5.Rxh8 e2 6.Th1 Rf7 (388.280) 87  TB:94
14.01   0:05   +12.93  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 e3 5.Rxh8 Rf7 6.Th1 Re6 7.Rg8 (437.745) 87  TB:105
15.01   0:05   +12.93  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 e3 5.Rxh8 Rf7 6.Th1 Rf6 7.Te1 (458.105) 87  TB:121
16.01   0:06   +13.53  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 e3 5.Rxh8 e2 6.Th1 Rd5 7.Rg7 Rd4 (547.568) 89  TB:150
17.01   0:07     +M24  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 Ta8 5.h8D Txh8 6.Rxh8 (609.766) 81  TB:1.045
18.01   0:07     +M24  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 Ta8 5.h8D Txh8 6.Rxh8 (618.038) 79  TB:1.243
19.01   0:08     +M24  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 Ta8 5.h8D Txh8 6.Rxh8 (628.568) 78  TB:1.439
20.01   0:08     +M24  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 Ta8 5.h8D Txh8 6.Rxh8 (647.064) 76  TB:1.866
21.01   0:09     +M24  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 Ta8 5.h8D Txh8 6.Rxh8 (693.904) 74  TB:2.600
22.01   0:10     +M24  1.Tb5 Ta7+ 2.Rg6 Ta8 3.Th5 Th8 4.Rg7 Ta8 5.h8D Txh8 6.Rxh8 (727.051) 73  TB:3.106

Regards,

Fabian
Up Topic Rybka Support & Discussion / Rybka Discussion / Rybka don't find this

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