Author: leonid
Date: 15:09:41 01/25/01
Go up one level in this thread
On January 25, 2001 at 17:07:45, Heiner Marxen wrote: >On January 25, 2001 at 16:19:40, leonid wrote: > >>On January 25, 2001 at 15:24:40, Heiner Marxen wrote: >> >>>On January 25, 2001 at 11:13:10, leonid wrote: >>> >>>>On January 25, 2001 at 10:57:06, José Antônio Fabiano Mendes wrote: >>>> >>>>>On January 25, 2001 at 09:57:29, leonid wrote: >>>>> >>>>>>Hi! >>>>>> >>>>>>If you like to solve some average mate position... >>>>>> >>>>>>[D]R1brkrnR/1N1qqqbN/3qqq1B/1B1bQNbQ/1bn1Q2B/3Q1Q2/3Q1Q2/1K6 w - - >>>>>> >>>>>>Please indicate your result. >>>>>> >>>>>>If you can depose here just one forced mate position from some world chess >>>>>>championship, it will be nice. Indicate exactly where this competition happened. >>>>>>I speak about championship where human found forced mate. Never mind if this >>>>>>championship was between two humans or man and machine. It could give an >>>>>>opportinity to see which program is best in real life situation. Even more that >>>>>>this, it will permit to tune selective search for forced mate to make it more >>>>>>effective. >>>>>> >>>>>>Thanks, >>>>>>Leonid. >>>>> >>>>> As written the second row [1N1qqqb] accounts for only 7 squares, >>>>> that's why the diagram is not displayed. JAFM >>>> >>>>Thanks for indicating mistake! I hope that now it will come in graphics. At list >>>>this time I will look if it is really there. >>>> >>>>Leonid. >>> >>>According to Chest there is no mate in 8 moves (41.6 min, K7/600 350MB hash). >>>What depth is expected for a solution? >>> >>>Ahem, what exactly is so "average" about this position? >> >>Hi, Heiner! I saw that this position could be solved with 11 moves or well >>below. Paul already said 10 moves as new maximum. You said that in 8, no mate >>for sure. > >Hi Leonid! > >I estimate 8 hours for depth 9, so I will omit that. >I'm currently running Paul's 15 positions. >Some appear to be also too deep for Chest. >I will report here, when I'm through. Good! I already depose this position in my library. Now each created position I can print when it is on the Chess Club site. Inside of my program I never wrote graphics since I considered this as finalization of program. I am too far from this. Some time money and very often absence of time limite my progress in actual chess program. >>Position was average in my mind since it was not that endless position of 20 or >>30 moves deep, like I have seen here already few times. Number of initial legal >>moves from each side is moderate. Only white side reach slightly over 100 moves. >> Black have only few responses after initiation of hostilities. > >Ah, I see. But "average"? With that many queens? >I consider 100 legal moves to be a huge number... >I remember that an early version of Chest was limited to 80 legal moves ;-) To be frank with you, this was usual positions for me when I wrote my first move generator, around 7 years ago. I had then 200 moves limite. Now I see that it is not enough. When I will rewrite for Linux, will put 300 moves limite. Somebody here, few months ago, came with position that contained more that 200 moves. Around 6 months ago I reached one side with forced mate positions where 9 queens you could see more than often. Some italian site done in 1997. Then I started regarding my beloved heavy positions as nothing shameful and even too damn usual. Later I found on Internet even more places with forced mate densely populated with equally pretty queens of both ethnic origin. Leonid. >Heiner
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