The most other chess engines find this mat in 4 around 00:00!!
How about Rybka 3?
MAT in 4!!
8/8/8/1p2Q3/1k6/1p6/1p6/bK6 w - - 0 7
JP.
Rybka don't find mat in 4?
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Re: Rybka don't find mat in 4?
Human sees it right away, but Default has problems. Dyanmic does a little better, but still not there either.jpqy wrote:The most other chess engines find this mat in 4 around 00:00!!
How about Rybka 3?
MAT in 4!!
8/8/8/1p2Q3/1k6/1p6/1p6/bK6 w - - 0 7
JP.
Analysis by Rybka 3 Human :
1.Qd4+ Ka5 2.Qe4 Ka6 3.Qe6+ Ka5 4.Qxb3 Kb6 5.Qd5 Ka5 6.Qe4 Kb6 7.Qd3 Ka5
+- (4.30) Depth: 2 00:00:00
+- (4.79) Depth: 13 00:00:00 19kN, tb=2
1.Qc7
+- (5.11) Depth: 13 00:00:00 21kN, tb=3
+- (#4) Depth: 13 00:00:00 103kN, tb=5
Analysis by Rybka 3 :
1.Qd4+
+- (4.78) Depth: 2 00:00:00
+- (#27) Depth: 17 00:01:06 18607kN, tb=732
Analysis by Rybka 3 Dynamic :
1.Qd5 Ka5 2.Qd4 Ka6 3.Qd8 b4 4.Qg5 Kb6
+- (3.19) Depth: 2 00:00:00
+- (4.89) Depth: 14 00:00:00 28kN, tb=4
1.Qd4+
+- (5.09) Depth: 14 00:00:00 32kN, tb=5
+- (#6) Depth: 14 00:00:03 824kN, tb=5
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers
__________________________________________________________________
Ted Summers
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Re: Rybka don't find mat in 4?
Thanks Ted!
Have you restart your Gui every time you change engine?
Because else the next engine will find the calculatings back in his Hash!
Kind regards,
Jean-Paul.
Have you restart your Gui every time you change engine?
Because else the next engine will find the calculatings back in his Hash!
Kind regards,
Jean-Paul.
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- Joined: Mon Mar 13, 2006 2:34 pm
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Re: Rybka don't find mat in 4?
Wow, when I did as you suggested NONE of the Rybka's found it.jpqy wrote:Thanks Ted!
Have you restart your Gui every time you change engine?
Because else the next engine will find the calculatings back in his Hash!
Kind regards,
Jean-Paul.
Analysis by Rybka 3 Dynamic :
1.Qd5 Ka5 2.Qd4 Ka6 3.Qe3 Ka5 4.Qxb3 Ka6 5.Qd3 Ka5 6.Qe4
+- (3.67) Depth: 2 00:00:00
+- (4.36) Depth: 13 00:00:00 10kN, tb=1
1.Qd4+
+- (4.56) Depth: 13 00:00:00 10kN, tb=1
+- (209.16) Depth: 13 00:00:00 86kN, tb=2
Analysis by Rybka 3 :
1.Qd4+
+- (4.78) Depth: 2 00:00:00
+- (5.71) Depth: 16 00:00:13 3641kN, tb=169
Analysis by Rybka 3 Human :
1.Qd4+
+- (4.48) Depth: 4 00:00:00
+- (#26) Depth: 19 00:01:22 24093kN, tb=842
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers
__________________________________________________________________
Ted Summers
Re: Rybka don't find mat in 4?
Interesting position. I haven't looked why yet but Schola doesn't find it either until shown Qc7! - and then it takes to ply 18 to see it. Perhaps there's something that the null move cutoff is tripping up over.jpqy wrote:The most other chess engines find this mat in 4 around 00:00!!
How about Rybka 3?
MAT in 4!!
8/8/8/1p2Q3/1k6/1p6/1p6/bK6 w - - 0 7
JP.
Andy.
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Re: Rybka don't find mat in 4?
[D] 8/8/8/1p2Q3/1k6/1p6/1p6/bK6 w - - 0 7
Re: Rybka don't find mat in 4?
Yup - null move it is. And it "trips" up my Zungwang code because of that Bishop. Although it can't move, it's material score (plus the three pawns) brings it above the value of a Rook which is one of the things I use to determine when not to try it.plattyaj wrote:Interesting position. I haven't looked why yet but Schola doesn't find it either until shown Qc7! - and then it takes to ply 18 to see it. Perhaps there's something that the null move cutoff is tripping up over.
Andy.
Interestingly, given the threads about why Rybka doesn't give full PVs, accurate node counts, etc., this probably tells us that Rybka doesn't do verified null move and that it still allows null move with that amount of material on the board. So all I have to do to beat it is ...
Andy.
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Re: Rybka don't find mat in 4?
Takes a few seconds, but it finds it:jpqy wrote:The most other chess engines find this mat in 4 around 00:00!!
How about Rybka 3?
MAT in 4!!
8/8/8/1p2Q3/1k6/1p6/1p6/bK6 w - - 0 7
JP.
Analysis by Rybka 3 1-cpu 32-bit:
1.Qd4+ Ka5 2.Qe4 b4 3.Qd3
+- (5.02) Depth: 6 00:00:00 1kN
1.Qd4+ Ka5 2.Qe4 b4 3.Qd3 Kb6
+- (5.07) Depth: 7 00:00:00 2kN
1.Qd4+ Ka5[] 2.Qe4 Kb6 3.Qb4 Kc6[] 4.Qxb3 Kc5 5.Qc3+
+- (5.03) Depth: 8 00:00:00 12kN
1.Qd4+ Ka5[] 2.Qe4 Kb6 3.Qb4 Kc6[] 4.Qxb3 Kc5 5.Qc3+
+- (5.03) Depth: 9 00:00:00 13kN
1.Qd4+ Ka5[] 2.Qe4 Kb6 3.Qb4 Kc6[] 4.Qxb3 Kc5 5.Qc3+
+- (5.03) Depth: 10 00:00:00 14kN
1.Qd4+ Ka5[] 2.Qe4 Kb6 3.Qb4 Kc6[] 4.Qxb3 Kc5 5.Qc3+ Kb6[]
+- (5.03) Depth: 11 00:00:00 15kN
1.Qd4+ Ka5[] 2.Qe4 Kb6 3.Qb4 Kc6[] 4.Qxb3 Kc5 5.Qc3+ Kb6[] 6.Qd4+
+- (5.03) Depth: 12 00:00:00 18kN
1.Qd4+ Ka5[] 2.Qe4 Kb6 3.Qb4 Kc6[] 4.Qxb3 Kc5 5.Qc3+ Kb6[] 6.Qd4+ Ka5[] 7.Qd6
+- (5.03) Depth: 13 00:00:00 22kN
1.Qc7
+- (#4) Depth: 13 00:00:27 2678kN
(Silver, Private 11.08.2008)
"Tactics are the bricks and sticks that make up a game, but positional play is the architectural blueprint."
Re: Rybka don't find mat in 4?
Whit to move. Analysis from Rybka 3.jpqy wrote:The most other chess engines find this mat in 4 around 00:00!!
How about Rybka 3?
MAT in 4!!
8/8/8/1p2Q3/1k6/1p6/1p6/bK6 w - - 0 7
JP.
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Re: Rybka don't find mat in 4?
Interesting yes ... I can always solve as above using Single Processor version, but not with Multiprocessor version; at least not using multi-core. Have not tried setting the MC version to using only 1 core.