Author: Uri Blass
Date: 23:45:23 01/21/01
Go up one level in this thread
On January 22, 2001 at 01:48:47, Pete Galati wrote: >On January 22, 2001 at 01:14:32, Uri Blass wrote: > >>On January 21, 2001 at 19:39:16, Pete Galati wrote: >> >>>On January 21, 2001 at 19:26:43, Paul wrote: >>> >>>>On January 21, 2001 at 19:24:32, Pete Galati wrote: >>>> >>>>>On January 21, 2001 at 19:17:18, Paul wrote: >>>>> >>>>>>On January 21, 2001 at 19:14:08, John Coffey wrote: >>>>>> >>>>>>>On January 21, 2001 at 16:56:42, Paul wrote: >>>>>>> >>>>>>>>On January 21, 2001 at 11:56:09, leonid wrote: >>>>>>>> >>>>>>>>>Hi! >>>>>>>>> >>>>>>>>>This mate position is very handy when you want to check the limits in your >>>>>>>>>program. It is amusing also. Number of legal moves for both sides is slightly >>>>>>>>>over one hundred. >>>>>>>>> >>>>>>>>> knq3q1/rq1q1qbQ/Qq2Q3/1Qn1Q2B/Q1qN1Q1r/4K1B1/1q4QR/1N1q3Q white to go. >>>>>>>>> >>>>>>>>>If you will solve, it will be nice if you will indicate your result. >>>>>>>>> >>>>>>>>>Thanks, >>>>>>>>>Leonid. >>>>>>>> >>>>>>>>Hi again Leonid! >>>>>>>> >>>>>>>>It took my program 45 minutes ... phewwwwwww! >>>>>>>>Here's the line, a mate in 12: >>>>>>>> >>>>>>>>1. Qxa7+ Qxa7 2. Qxa7+ Kxa7 3. Qeb6+ Ka8 4. Qgxb7+ Qdxb7 5. Qxb8+ Qxb8 >>>>>>>>6. Qxb8+ Qxb8 7. Q6a5+ Na6 8. Qaxa6+ Qa7 9. Qg8+ Bf8 10. Qxf8+ Qe8+ >>>>>>>>11. Qfxe8+ Qc8 12. Qxc8x >>>>>>>> >>>>>>>>I think I'm going to skip your next problem, that will be too difficult >>>>>>>>for me ;) >>>>>>>> >>>>>>>>Greetings, >>>>>>>>Paul >>>>>>> >>>>>>>Fritz 6 has been thinking for 3 hours and 45 minutes, shows no analysis and >>>>>>>still says 1/1 ply. I wonder what is happening with the transposition table, >>>>>>>:-). >>>>>>> >>>>>>>John Coffey >>>>>> >>>>>>:) >>>>>> >>>>>>It's the QSearch blowing up, you have to control that somehow ... >>>>>>and that's easier when you're the author of the program in question :) >>>>>> >>>>>>Paul >>>>> >>>>>I'd try rebooting and try again. Something sounds broken with searching on a >>>>>position for 3 hours and being at 1/1 ply. That's just not right (Louie >>>>>Anderson impression). >>>>> >>>>>Pete >>>> >>>>Well, I *was* waiting for your solutions from Comet & Junior ... >>>>or have you been rebooting al this time ;) >>>> >>>>Paul >>> >>>Oops, I must be becoming known for what I run analysis through, but I figure >>>everyone else will use Fritz and Crafty etc., so why should I? >> >>It is not truth. >> >>I used Junior to find the mate in 12 line and not Fritz and Crafty. > >It was a generalization. Fritz and Crafty seem to be the most common. > >> >>Fritz and Crafty are not good programs to use in complicated positions when both >>sides have 9 queens. > >I'll try to remember that next time I see 9 queens. > >> >> >>> >>>Actually, I've been running Junior on that other position that you pasted in >>>that you said you gotta go deep to get an answer on, and Junior doesn't seem to >>>be coming up with anything (that I know of)' >> >>> >>>New position >>>5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - 0 1 >> >>You seem to use always the wrong program. > >I tend to use what ammuses me the most at the moment. Not the best way to do >it. > >>Junior is the wrong program to solve mate in 30 when Rebel solves it with no >>problems. >> >>Uri > >I agree. I gave up. Actually, I didn't know that Rebel solved it in mate in 30 >moves when I started. He said it was deep, so I figured that Junior searched >about as fast as anything I had, but I only have so much time. Junior searches a lot of nodes but the question is if the program extends long forced lines. Rebel extend long forced lines and can solve the mate in 30 in 1 second. Junior does not do it so it cannot solve it even if you give it 24 hours Junior needs big depth (at least depth 29 or 30 to see a mate in 30). Junior does not analyze lines with more than 2x+1 plies at depth x so it cannot see mate in 30 at smaller depthes unless it is tablebases mate and the mate in the diagram is not a tablebase mate. Uri
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