Author: Tony Werten
Date: 11:07:07 01/27/01
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On January 27, 2001 at 11:09:10, leonid wrote: >On January 27, 2001 at 09:10:05, Tony Werten wrote: > >>On January 27, 2001 at 08:53:07, leonid wrote: >> >>>Hi! >>> >>>If you like to solve forced mate position from real game, it is the one. >>> >>>[D]7r/p4R2/1p4nk/3qP3/P1pr4/6PB/2Q4K/5R2 w - - >>> >>>It is from game played in Hollannd in 1975 between Ernsteen and Berchem. >>> >>>Leonid. >> >>XiniX solves this one in 1 sec 1. Qxg6+ Kxg6 2. Rf6+ , Kg5 3. Rf5+ , Kg6 4. >>Rf6+ , Kg7 5. Rg5+ , Kh7 6. Bf5+ > >If you can mention what is this program and on what computer you solved, it will >be appreciate. XiniX is a chessprogram I wrote in Delphi. It finished 10th ( out of 14 ) at the last dutch championship. After the first weekend I was on shared 3rd place, the second weekend disaster stroke. I had a little correction-for-depth-by-checkmates mistake. In the game against Ant I had 3 queens against a pawn but my engine refused to mate, giving me a loss on time ( I forgot to claim a draw ). In another game I oversearched. ( new vocabalary ) I outsearched my opponent by 3 ply, went for what should be a pawn win, but when the game arrived there I had an undeffendable pinned knight. I should have searched to 2 ply more or 3 ply less and there wouldn't have been a problem. Machine is an AMD K6-2 333 Mhz Tony > >Time is good. > > >>This way it is easy. >> >>The position in BT2630 is a couple of moves earlier. ( I never managed to solve >>this one ) >> >>[D] 2b1q3/p7/1p1p2kb/nPpN3p/P1P1P2P/6P1/5R1K/5Q2 w - - >> >>Tony > >And in how many moves this position expected to be solved? > >I tried it by selective search 13 moves deep but, after waiting around 6 >minutes, disconnected. In 10 moves selective could find nothing. By brute force >even 5 moves lead me already to 5 minutes search. No mate existe in five. >Thought that maybe it is some 20 moves position that is, anyway, beyond my >actual program. > >If somebody would like to solve average positions (not too easy but not too >complicated), below is one. > >[D]qn1kbrqn/n1nqn1bp/bN1N1N1N/B1N1Nn1B/N1N1N1N1/8/1R1Q1R2/3K4 w - - > >Mate existe for sure in 11 moves. Response was found by selective search and >minimal number of moves is unknown. > >Leonid.
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