Author: leonid
Date: 10:16:22 01/21/01
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On January 21, 2001 at 12:43:34, Heiner Marxen 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. > >A hint to you, Leonid: if you like to see a diagram for the notation above: >(1) Stick a [D] directly before the FEN string, >(2) append (blank seperated) colour to move, i.e. b or w >(3) append (blank seperated) castling rights: - for nothing, KQkq or part > of it for white/black king side/queen side >(4) append (blank seperated) e.p. info: - for "no e.p. possible" >You can look up the details in the FEN standard, part of the PGN standard. >Look at the line below, which I typed in, and see the diagram, provided not >by me, but by the CCC web server, which recognizes the [D] and FEN after it, >and inserts the graphics. You can do that also. Thanks! Will try to use it the next time. Leonid. >[D]knq3q1/rq1q1qbQ/Qq2Q3/1Qn1Q2B/Q1qN1Q1r/4K1B1/1q4QR/1N1q3Q w - - > >Chest says "no mate in 9" (216 seconds, K7/600 335MB hash). >I will ask for more depth... Are there no mistake? You have really 335Mb hash? 216 sec for 9 moves like very good. I went, by brute force, only up to 7 moves. It was already 2 min. 19 sec. But for this position, which look very heavy, branching factor was very normal. Like what you can expect from usual forced mate position. 4 moves - 0.77 sec branching factor 5.8 5 moves - 4.39 sec 5.3 6 moves - 23.02 sec 6.1 7 moves - 2 min 19 sec Leonid. >Heiner > >>If you will solve, it will be nice if you will indicate your result. >> >>Thanks, >>Leonid.
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