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Up Topic Rybka Support & Discussion / Rybka Discussion / Why Rybka can't solve this? Is a depth=59 problem?
- - By George Tsavdaris (****) Date 2007-07-19 22:04
Rybka 1.2i can't find the correct 1.h3! that wins and plays the incorrect 1.h4? that draws.

It reaches depth 59 very quickly and then stops and plays the incorrect move.
Would a depth more than 59 help here? I don't think so.
So then why Rybka 1.2i can't find the correct move?
Does Rybka 2.3.2a does better?

Mate in 16.
8/8/8/2p5/1pp5/brpp4/1pprp2P/qnkbK3 w - - 0 1


Analysis by Rybka 1.2i 32-bit:

2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6
  -+  (-22.60)   Depth: 7   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2
  -+  (-21.91)   Depth: 8   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1
  =  (0.03)   Depth: 9   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q
  =  (0.03)   Depth: 10   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2
  =  (0.03)   Depth: 11   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4
  =  (0.03)   Depth: 12   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1
  =  (0.03)   Depth: 13   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 14   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 15   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 16   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 17   00:00:00
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 18   00:00:00  1kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 19   00:00:00  1kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 20   00:00:00  2kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 21   00:00:00  3kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 22   00:00:00  4kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 23   00:00:01  5kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 24   00:00:01  7kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 25   00:00:01  10kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 26   00:00:01  12kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 27   00:00:01  16kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 28   00:00:02  21kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 29   00:00:02  28kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 30   00:00:02  36kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 31   00:00:02  46kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 32   00:00:02  57kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 33   00:00:02  74kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 34   00:00:02  97kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 35   00:00:02  126kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 36   00:00:03  159kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 37   00:00:03  196kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 38   00:00:03  249kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 39   00:00:03  316kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 40   00:00:03  399kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 41   00:00:04  494kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 42   00:00:04  602kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 43   00:00:04  743kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 44   00:00:04  923kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 45   00:00:05  1140kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 46   00:00:05  1390kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 47   00:00:05  1670kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 48   00:00:05  2012kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 49   00:00:05  2434kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 50   00:00:06  2937kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 51   00:00:06  3508kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 52   00:00:06  4139kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 53   00:00:07  4865kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 54   00:00:08  5729kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 55   00:00:10  6743kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 56   00:00:11  7876kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 57   00:00:13  9117kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 58   00:00:15  10488kN
2.h2-h4 Qa1-a2 3.h4-h5 Qa2-a1 4.h5-h6 Qa1-a2 5.h6-h7 Qa2-a1 6.h7-h8Q Qa1-a2 7.Qh8-h4 Qa2-a1 8.Qh4-h8 Qa1-a2
  =  (0.03)   Depth: 59   00:00:17  12054kN

---------------------------------------------------------------------

Situation is even worse since Rybka 1.2i ignores a simple mate in 6 in this position with Nxc5:

Nxc5 and mate in 6.
Yet Rybka plays Nd8 thinking the position is only a draw!
8/1N6/8/2p5/1pp5/brpp4/qpprp3/1nkbK3 w - - 0 1


Analysis by Rybka 1.2i 32-bit:
11.Nb7-d8
  =  (0.03)   Depth: 11   00:00:00
..........SNIP.........
..........................
11.Nb7-d8
  =  (0.03)   Depth: 54   00:00:07  3071kN
11.Nb7-d8
  =  (0.03)   Depth: 55   00:00:07  3648kN
11.Nb7-d8
  =  (0.03)   Depth: 56   00:00:07  4412kN
11.Nb7-d8
  =  (0.03)   Depth: 57   00:00:07  5362kN
11.Nb7-d8
  =  (0.03)   Depth: 58   00:00:07  6356kN
11.Nb7-d8
  =  (0.03)   Depth: 59   00:00:07  7465kN
---------------------------------------------------------------------
Yes i know the position is "stupid" and uninteresting but i can't believe Rybka can miss such a mate in 6.

What about a mate in 3? :)

Well Rybka 1.2i misses it again:

Mate in 3 with Nxc4.
Rybka misses it thinking the position is draw and plays Ne4.
8/8/3N4/8/1pp5/brpp4/1pprp3/qnkbK3 w - - 0 1


Analysis by Rybka 1.2i 32-bit:

14.Nd6-e4
  =  (0.03)   Depth: 2   00:00:00
14.Nd6-e4
  =  (0.03)   Depth: 3   00:00:00
..............
..............
14.Nd6-e4
  =  (0.03)   Depth: 58   00:00:10  11180kN
14.Nd6-e4
  =  (0.03)   Depth: 59   00:00:11  13093kN
---------------------------------------------------------------------

Unfortunately as you can guess Rybka misses the mate in 2 if you force the Nxc4 from the above position.
Misses mate in 2! Oh well.....
I just want the possible reason....
Parent - - By Uri Blass (*****) Date 2007-07-19 23:01 Edited 2007-07-19 23:04
The reason is that you did not buy newer version of rybka and rybka1.x does not see zugzwangs.

depth 53 is enough for 2.3.2a
unfortunately it cannot see underpromotion in the pv so the pv is not correct but it can find underpromotion in case that it is done in the first move.

New game
8/8/8/2p5/1pp5/brpp4/1pprp2P/qnkbK3 w - - 0 1


Analysis by Rybka 2.3.2a 32-bit :

1.h2-h4 Qa1-a2
  -+  (-29.01)   Depth: 5   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5
  -+  (-29.18)   Depth: 6   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1
  -+  (-28.98)   Depth: 7   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6
  -+  (-28.08)   Depth: 8   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2
  =  (0.00)   Depth: 9   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1
  =  (0.00)   Depth: 10   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q
  =  (0.00)   Depth: 11   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2
  =  (0.00)   Depth: 12   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5
  =  (0.00)   Depth: 13   00:00:00
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1
  =  (0.00)   Depth: 14   00:00:01
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 15   00:00:01
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 16   00:00:01
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 17   00:00:01
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 18   00:00:01
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 19   00:00:01  1kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 20   00:00:01  1kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 21   00:00:01  1kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 22   00:00:02  1kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 23   00:00:02  2kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 24   00:00:02  2kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 25   00:00:02  3kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 26   00:00:02  4kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 27   00:00:02  6kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 28   00:00:02  8kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 29   00:00:02  10kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 30   00:00:03  13kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 31   00:00:03  18kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 32   00:00:03  23kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 33   00:00:03  31kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 34   00:00:03  40kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 35   00:00:03  54kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 36   00:00:03  69kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 37   00:00:03  89kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 38   00:00:04  114kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 39   00:00:04  146kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 40   00:00:04  187kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 41   00:00:04  238kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 42   00:00:05  301kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 43   00:00:05  379kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 44   00:00:05  474kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 45   00:00:05  594kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 46   00:00:05  748kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 47   00:00:06  934kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 48   00:00:07  1158kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 49   00:00:09  1427kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 50   00:00:11  1759kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 51   00:00:14  2171kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 52   00:00:17  2695kN
1.h2-h4 Qa1-a2 2.h4-h5 Qa2-a1 3.h5-h6 Qa1-a2 4.h6-h7 Qa2-a1 5.h7-h8Q Qa1-a2 6.Qh8-e5 Qa2-a1 7.Qe5-h8 Qa1-a2
  =  (0.00)   Depth: 53   00:00:21  3414kN
1.h2-h3 Qa1-a2 2.h3-h4 Qa2-a1 3.h4-h5 Qa1-a2 4.h5-h6 Qa2-a1 5.h6-h7 Qa1-a2 6.h7-h8Q Qa2-a1
  +-  (#15)   Depth: 53   00:00:23  3717kN
1.h2-h3 Qa1-a2 2.h3-h4 Qa2-a1 3.h4-h5 Qa1-a2 4.h5-h6 Qa2-a1 5.h6-h7 Qa1-a2 6.h7-h8Q Qa2-a1 7.Qh8-e5 Qa1-a2 8.Qe5-h8 Qa2-a1 9.Qh8-e5 Qa1-a2 10.Qe5-h8 Qa2-a1 11.Qh8-e5 Qa1-a2 12.Qe5-h8 Qa2-a1 13.Qh8-e5 Qa1-a2 14.Qe5-h8 Qa2-a1 15.Qh8-e5 Qa1-a2 16.Qe5-h8 Qa2-a1
  +-  (#15)   Depth: 53   00:00:24  3807kN
1.h2-h3 Qa1-a2 2.h3-h4 Qa2-a1 3.h4-h5 Qa1-a2 4.h5-h6 Qa2-a1 5.h6-h7 Qa1-a2 6.h7-h8Q Qa2-a1 7.Qh8-e5 Qa1-a2 8.Qe5-h8 Qa2-a1 9.Qh8-e5 Qa1-a2 10.Qe5-h8 Qa2-a1 11.Qh8-e5 Qa1-a2 12.Qe5-h8 Qa2-a1 13.Qh8-e5 Qa1-a2 14.Qe5-h8 Qa2-a1 15.Qh8-e5 Qa1-a2 16.Qe5-h8 Qa2-a1
  +-  (#15)   Depth: 54   00:00:26  4107kN
1.h2-h3 Qa1-a2 2.h3-h4 Qa2-a1 3.h4-h5 Qa1-a2 4.h5-h6 Qa2-a1 5.h6-h7 Qa1-a2 6.h7-h8Q Qa2-a1 7.Qh8-e5 Qa1-a2 8.Qe5-h8 Qa2-a1 9.Qh8-e5 Qa1-a2 10.Qe5-h8 Qa2-a1 11.Qh8-e5 Qa1-a2 12.Qe5-h8 Qa2-a1 13.Qh8-e5 Qa1-a2 14.Qe5-h8 Qa2-a1 15.Qh8-e5 Qa1-a2 16.Qe5-h8 Qa2-a1
  +-  (#15)   Depth: 55   00:00:28  4495kN
1.h2-h3 Qa1-a2 2.h3-h4 Qa2-a1 3.h4-h5 Qa1-a2 4.h5-h6 Qa2-a1 5.h6-h7 Qa1-a2 6.h7-h8Q Qa2-a1 7.Qh8-e5 Qa1-a2 8.Qe5-h8 Qa2-a1 9.Qh8-e5 Qa1-a2 10.Qe5-h8 Qa2-a1 11.Qh8-e5 Qa1-a2 12.Qe5-h8 Qa2-a1 13.Qh8-e5 Qa1-a2 14.Qe5-h8 Qa2-a1 15.Qh8-e5 Qa1-a2 16.Qe5-h8 Qa2-a1
  +-  (#15)   Depth: 56   00:00:31  5000kN
1.h2-h3 Qa1-a2 2.h3-h4 Qa2-a1 3.h4-h5 Qa1-a2 4.h5-h6 Qa2-a1 5.h6-h7 Qa1-a2 6.h7-h8Q Qa2-a1 7.Qh8-e5 Qa1-a2 8.Qe5-h8 Qa2-a1 9.Qh8-e5 Qa1-a2 10.Qe5-h8 Qa2-a1 11.Qh8-e5 Qa1-a2 12.Qe5-h8 Qa2-a1 13.Qh8-e5 Qa1-a2 14.Qe5-h8 Qa2-a1 15.Qh8-e5 Qa1-a2 16.Qe5-h8 Qa2-a1
  +-  (#15)   Depth: 57   00:00:36  5709kN

(,  20.07.2007)
Parent - - By George Tsavdaris (****) Date 2007-07-20 14:04
OK thanks for the analysis. Yes i need to upgrade to the new "weapons" but i have to buy first a multiprocessor.....

>depth 53 is enough for 2.3.2a
>unfortunately it cannot see underpromotion in the pv so the pv is not correct but it can find underpromotion in case that it is done in the first move.
>1.h2-h3 Qa1-a2 2.h3-h4 Qa2-a1 3.h4-h5 Qa1-a2 4.h5-h6 Qa2-a1 5.h6-h7 Qa1-a2 6.h7-h8Q Qa2-a1 7.Qh8-e5 Qa1-a2 8.Qe5-h8 Qa2-a1 >9.Qh8-e5 Qa1-a2 10.Qe5-h8 Qa2-a1 11.Qh8-e5 Qa1-a2 12.Qe5-h8 Qa2-a1 13.Qh8-e5 Qa1-a2 14.Qe5-h8 Qa2-a1 15.Qh8-e5 Qa1-a2 >16.Qe5-h8 Qa2-a1  +-  (#15)   Depth: 57   00:00:36  5709kN


What i don't understand is how Rybka finds a mate promoting to a Queen, while in this position if you promote to a Queen you can't win!
Does Rybka just has in the PV a Queen promotion, while in reality it considers a Knight promotion? If this is the case, then why it does not report a Knight promotion and only a Queen? Seems odd.

Also in the position i had the name: "Mate in 16" so i wonder what happens with Rybka's announcement mate in 15. Is Rybka correct? I will try to find out if this is a mate in 15 or 16.....
Parent - - By Uri Blass (*****) Date 2007-07-20 14:14
1)I think that it is mate in 15
I will check later.
2)Rybka has a bug in the pv and cannot report promotion that is not promotion to queen in the pv except the case when the first move of the pv is not a queen promotion.
Rybka reads the moves after the queen promotion from the hash and this is the reason for the wrong pv.

Uri
Parent - By George Tsavdaris (****) Date 2007-07-20 14:29
Yes it's a mate in 15, my fault.
The original position was mate in 16 but the original position was not the one i gave. That was my fault.
The original position was the following and when white plays 1.Kxe1 Qa1 we have mate in 15 of course....

8/8/8/2p5/1pp5/brpp4/qpprpK1P/1nkbn3 w - - 0 1
Parent - - By insipid (**) Date 2007-07-21 17:49
You don't need the mp version to upgrade to a version that can see zugzwangs.  Version 2.3.2a can do it, multi or single processor version.
Parent - - By George Tsavdaris (****) Date 2007-07-21 18:01
I know, i just don't want to buy the single version and then when i will buy a quad to have to buy again an MP version.....
Parent - By Uri Blass (*****) Date 2007-07-21 18:21
You do not have to buy again.

You have the option not to buy the mp version and use the single processor version in your quad.

The single processor version is not the best for that computer but 1.2 is also not the best for the computer that you use now and 2.3.2a is better.

You also have the option to buy the mp version and use it on single processor before you get a quad.
buying the mp version does not mean that you cannot use it on a single processor machine.

Uri
Parent - - By ernest (****) Date 2007-07-21 22:05

> I know, i just don't want to buy the single version and then when i will buy a quad to have to buy again an MP version.....


Shame on you, George, the MP version, which includes the SP version, costs only 20 Euro more... :-(
Parent - By George Tsavdaris (****) Date 2007-07-22 10:42

>Shame on you, George, the MP version, which includes the SP version, costs only 20 Euro more... :-(


?
Yes i don't disagree with that. I have said i will buy the MP version so.....?
I also have said that i don't want to buy the non-MP version and then later to buy the MP version.

But Uri is correct. I can buy the MP version and just use it on my current non-multi CPU PC. I knew that of course too, but i just want to wait until i buy an Intel Core 2 QX6800(or the newest it would be then) or a 8-CPU machine.....  Around September i hope....

The big problem will be with windows Vista. As i have heard that they don't support many programs Windows XP support.
I guess i can use a virtual PC thing, and have it both.....
Windows Vista support Rybka 64-bit i guess, right?
Parent - By Henrik Dinesen (***) Date 2007-07-22 10:40
AFAIK you can simply upgrade when you have the new PC.

Henrik
Up Topic Rybka Support & Discussion / Rybka Discussion / Why Rybka can't solve this? Is a depth=59 problem?

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