Author: leonid
Date: 20:04:09 07/18/99
Go up one level in this thread
On July 18, 1999 at 10:43:31, Ricardo Gibert wrote: >On July 17, 1999 at 15:42:00, Heiner Marxen wrote: > >>On July 17, 1999 at 11:37:13, Robert Hyatt wrote: >> >>>On July 17, 1999 at 07:16:04, Michel Langeveld wrote: >>> >>[snip] >>>>Thanks for the answer. You were right.. I did not meant the largest distance >>to mate but largest possible moves in 1 pos. I also noticed a position which >>>>9 queens has a lot of moves. But I think if additional pieces are added more >>moves are possible... but how much...? >>> >>>I am pretty sure the max is under 220. Such a FEN was posted on r.g.c.c a year >>>or two ago... you might find it in DejaNews with a search... >> >>Citing from a news article from Bernhard Sadlowski, Oct 31 1996: >> >>1. no promoted pieces, without promotion moves: 109 white moves (W.Cross 1967) >>2. no promoted pieces : 144 white moves (J.Ban 1960) >>3. with promoted pieces : 218 white moves (Dickins 1968) >>4. with all 32 pieces : 99 white moves (HH.Cross 1946) >> >>(records taken from the book "Maerchenschach" by Anthony Dickins) >> >>1. 5k2/2K5/3N1B2/P1NB4/6Q1/4R3/P1PP1P1P/1R6 w - - 0 1 >>2. n1r1r1b1/1P1P1P1P/1Q6/3NBNK1/R7/4p1p1/3PBPkP/2R5 w - - 0 1 >>3. 3Q4/1Q4Q1/4Q3/2Q4R/Q4Q2/3Q4/1Q4Rp/1K1BBNNk w - - 0 1 >>4. q2Q3r/n6R/kpB1N1K1/p1p1Bppp/1PN3P1/1n1pp1b1/P1PPPP1P/r5Rb w - - 0 1 >> >>Heiner > >Are these "proven" maximums or are they "best known" maximums? If somebody wants to know the highest number of nodes that in one ply can exist, my suggestion will be 200. Probably somebody write its own game. In very few positions (and only in very artificial one) number of nodes (moves) goes beyond 70. If your are interested, I can send you few "problems" that illustrate this fact. These are the positions where mate is inevitable in 5 or 6 moves, and where we have even 9 queens on the board beside few other strong pieces. The most "populated" position have only 113 nodes. Those positions I used when debuging my moves generator and trying to figure out what is the maxium number of nodes that can be expected in the game. Leonid. leonid@total.net
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