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Up Topic Rybka Support & Discussion / Rybka Discussion / Is this a known rybka 3 bug
- - By Omega-three (**) Date 2009-09-30 12:51
http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=12706

Rybka 3 reports this has a mate in 5

It is in fact a mate in 6 according to 6 man tbs

[Event "?"]
[Site "?"]
[Date "1917.01.01"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "8/7p/7K/R7/Nk6/R7/8/8 w - - 0 1"]
[SetUp "1"]

1. Nc3 {[%t bLon] Mate in 6:} 1... Kc4 2. Nd5 Kd4 3. Ne3 Ke4 4. Nf5 Kf4 5. Nd6
Kg4 6. R5a4# {(Tablebases)}{*} *

mike
Parent - By Asylum (**) Date 2009-09-30 12:54
New game

(Fritz 12 GUI)

8/7p/7K/R7/Nk6/R7/8/8 w - - 0 1


Analysis by Cyclone xTreme Rage:

1.Nc5 Kc4 2.Kxh7 Kd5 3.Rd3+ Kc4
  +-  (13.61)   Depth: 6/13   00:00:00  6kN
1.Nc5 Kc4 2.R3a4+ Kd5 3.Nd3+ Kd6 4.Kxh7 Kc7 5.Kg6 Kb6
  +-  (13.60)   Depth: 7/19   00:00:00  21kN
1.Nc5 Kc4 2.R3a4+ Kd5 3.Nd3+ Kd6 4.Kxh7 Ke6 5.Kg6 Ke7 6.Re5+ Kd6 7.Rd4+ Kc6 8.Rc5+ Kb6
  +-  (13.75)   Depth: 8/27   00:00:00  75kN
1.Nc5 Kc4 2.R3a4+ Kc3 3.Kxh7 Kd2 4.Kg6 Kc3 5.Re4 Kb2 6.Nd3+ Kc3
  +-  (13.87)   Depth: 9/30   00:00:00  257kN
1.Nc5 Kc4 2.R3a4+ Kc3 3.Ra7 Kc2 4.Rxh7 Kc3 5.Re4 Kc2 6.Kg6 Kc3 7.Rh3+ Kb2
  +-  (14.07)   Depth: 10/34   00:00:00  823kN
1.Nc3 Kc4 2.R5a4+ Kc5 3.Ra2 Kd6 4.Rd2+ Kc5 5.Rd5+ Kb6 6.Rb4+ Kc6 7.Rc4+ Kb6 8.Rb5+ Ka6 9.Ra4#
  +-  (#9)   Depth: 10/34   00:00:00  998kN
1.Nc3 Kc4 2.Ne2 Kb4 3.Kxh7 Kc4 4.Rc3+ Kb4 5.Ra2 Kb5 6.Rb2+ Ka4 7.Rcb3 Ka5 8.Ra2#
  +-  (#8)   Depth: 11/34   00:00:01  2640kN
1.Nc3 Kc4 2.Ne2 Kb4 3.Kxh7 Kc4 4.Rc3+ Kb4 5.Ra2 Kb5 6.Rb2+ Ka4 7.Rcb3 Ka5 8.Ra2#
  +-  (#8)   Depth: 12/34   00:00:01  3083kN
1.Nc5 Kc4 2.R3a4+ Kd5 3.Nd3+ Kd6 4.Rc5 Ke6 5.Kg7 h6 6.Rd4 Ke7 7.Re5#
  +-  (#7)   Depth: 12/34   00:00:01  3083kN
1.Nc5 Kc4 2.R3a4+ Kd5 3.Nd3+ Kd6 4.Rc5 Ke6 5.Kg7 h6 6.Rd4 Ke7 7.Re5#
  +-  (#7)   Depth: 13/34   00:00:01  5039kN
1.Nc5 Kc4 2.R3a4+ Kd5 3.Nd3+ Kd6 4.Rc5 Ke6 5.Kg7 h6 6.Rd4 Ke7 7.Re5#
  +-  (#7)   Depth: 14/34   00:00:02  5718kN
1.Nc5 Kc4 2.R3a4+ Kd5 3.Nd3+ Kd6 4.Rc5 Ke6 5.Kg7 h6 6.Rd4 Ke7 7.Re5#
  +-  (#7)   Depth: 15/34   00:00:03  9840kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 15/34   00:00:03  9840kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 16/34   00:00:03  11760kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 17/34   00:00:03  12192kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 18/34   00:00:03  12789kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 19/34   00:00:03  13573kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 20/34   00:00:03  14363kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 21/34   00:00:03  15460kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 22/34   00:00:04  15951kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 23/34   00:00:04  16743kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 24/34   00:00:04  17540kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 25/34   00:00:04  18333kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 26/34   00:00:04  19133kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 27/34   00:00:04  19935kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 28/34   00:00:04  20735kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 29/34   00:00:04  21534kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 30/34   00:00:05  22377kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 31/34   00:00:05  23170kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 32/34   00:00:05  23969kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 33/34   00:00:05  24763kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 34/34   00:00:05  25627kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 35/34   00:00:05  26420kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 36/34   00:00:05  27216kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 37/34   00:00:05  28013kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 38/34   00:00:06  28798kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 39/34   00:00:06  29536kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 40/34   00:00:06  30209kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 41/34   00:00:06  30950kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 42/34   00:00:06  31743kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 43/34   00:00:06  32521kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 44/34   00:00:06  33319kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 45/34   00:00:06  34360kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 46/34   00:00:07  35010kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 47/34   00:00:07  35901kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 48/34   00:00:07  36609kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 49/34   00:00:07  37383kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 50/34   00:00:07  38084kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 51/34   00:00:07  38885kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 52/34   00:00:07  39666kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 53/34   00:00:07  40780kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 54/34   00:00:08  41249kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 55/34   00:00:08  41976kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 56/34   00:00:08  42873kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 57/34   00:00:08  43631kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 58/34   00:00:08  44398kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 59/34   00:00:08  45155kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 60/34   00:00:08  45920kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 61/34   00:00:09  46700kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 62/34   00:00:09  47491kN
1.Nc3 Kc4 2.Nd5 Kd4 3.Ne3 Ke4 4.Nf5 Kf4 5.Nd6 Kg4 6.R5a4#
  +-  (#6)   Depth: 63/34   00:00:09  48242kN

(30.09.2009)
Parent - - By Lukas Cimiotti (Bronze) Date 2009-09-30 21:22
It's a known bug.
Parent - By Roland Rösler (****) Date 2009-10-01 00:33
Because Rybka knows a mate in #0! :-)
Parent - - By Banned for Life (Gold) Date 2009-10-01 03:50
Like her creator, Rybka doesn't count very well.
Parent - - By Uly (Gold) Date 2009-10-01 06:22
Rybka doesn't know how to count nodes, doesn't know how to count plies and doesn't know how to count moves to mate, but at least she's consistent!
Parent - By keoki010 (Silver) Date 2009-10-01 15:14
:yell: :smile:
Parent - - By Asylum (**) Date 2009-10-01 15:54

>Rybka doesn't know how to count nodes, doesn't know how to count plies and doesn't know how to count moves to mate, but at least she's consistent!


But we can't say;  all woman are consistent!
Parent - - By Uly (Gold) Date 2009-10-01 16:41
Women are consistent in that nobody can understand them, just love them!
Parent - By Asylum (**) Date 2009-10-01 17:43
I love them ! Special the Mexicans
Parent - - By Uri Blass (*****) Date 2009-10-01 18:40
I am not sure about it.
I suspect that rybka knows to count something that other do not know to count and this knowledge make her winning.

Of course she is not going to tell you what she knows to count because in this case other programs may learn to count it and rybka is going to stop winning.

Uri
Parent - By Uly (Gold) Date 2009-10-01 19:06
It was a joke of course, but it's common knowledge that Rybka's nodes don't equal "positions analyzed", and that Rybka's plies don't equal "half moves" (since she'd allow negative half-moves.)

Explanations of these have been given in the past (nodes are adjusted so Rybka can be compared at different hardware and ply count... huh, I think it was deemed that true ply 1 wasn't really a full ply so the number was lowered, or something), mate in 7 being mate in 8 wasn't intentional.
Parent - - By Roland Rösler (****) Date 2009-10-01 22:24
I don´t believe it, because all ther other programmers looked in Osipovs code (Strelka) and don´t find anything.
Parent - - By Uly (Gold) Date 2009-10-01 23:31
Or they did, I recall many engines had a 100 elo jump and lost their "magic" (many people complained when all these engines, like Fritz or Shredder seemed to play noticeably more passive), though it could be a coincidence.
Parent - By InspectorGadget (*****) Date 2009-10-02 08:10

> Or they did, I recall many engines had a 100 elo jump and lost their "magic" (many people complained when all these engines, like Fritz or Shredder seemed to play noticeably more passive), though it could be a coincidence.


Yeah!
Parent - By Uri Blass (*****) Date 2009-10-02 05:55
1)I do not believe all other programmers looked at Osipov's code
2)Strelka is weaker than rybka3 so rybka3 still may know things that strelka does not know.
- By Omega-three (**) Date 2009-10-05 18:31
Yet another position, This time a mate in 12 that Rybka shows as a mate in 9 before changing to a mate in 12.

1QK3kq/6p1/8/6B1/8/8/8/8 w - - 0 1


Correct is :-

1. Kb7+ {[%t bLon] Mate in 12:} 1... Kh7 2. Qh2+ $1 2... Kg8 3. Qa2+ Kf8 4.
Qa8+ Kf7 5. Qxh8 $1 5... Kg6 6. Bd2 Kf7 7. Qh7 Ke6 8. Kc6 Kf7 9. Bg5 Ke6 10.
Qg6+ Ke5 11. Qd3 g6 12. Qd5# {(Tablebases)}{*} *

Mike
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