Author: Ricardo Gibert
Date: 13:46:23 08/03/99
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On August 03, 1999 at 16:16:16, KarinsDad wrote: >On August 03, 1999 at 16:00:21, Dann Corbit wrote: > >>On August 03, 1999 at 15:33:10, Ricardo Gibert wrote: >>[snip] >>>1. Instead of >>> distance to: mate >>> >>>2. Better is single number representing >>> distance to: mate OR win preseving capture OR win preserving pawn move >>> (whichever comes soonest) >>> >>>The 2nd way you ALWAYS win a winnable position. I find it hard to believe >>>Nalimov did his EGTB the way you assert (The 1st way). There is nothing I can >>>think of that would make the 2nd way listed above significant more difficult to >>>do. There is no good reason, I can think of, for using the 1st way in preference >>>to the 2nd one. >>> >>>I hope this is more clear, otherwise, I give up. >>How can this be done without the state of the current game information? E.g., I >>may have gone 49 moves without a capture -- but we clearly can't make the >>tablebase files 50 times their current size and still have them be practical. > >That's the entire point Dann. This does not occur. The program keeps track of >state information. The file keeps track of just a little more information. The >file is slightly bigger (i.e. it has 3 sets of information in it which could >really be dropped down to 2). In other words, the file says: x distance to mate >here is the next move, y distance to win preserving move. The positions are >already in that tablebase or in some other tablebase. > >The program keeps track of move by rep and 50 move rule. If x > 99 - number of >moves made so far that apply to 50 move rule, then use the win preserving move >instead of the mate move. If the mate move leads to a move by rep, then use the >win preserving move instead (it does not matter whether the win preserving move >is a capture or a pawn push, just as long as it preserves the win). Correcto! I consider it more likely that Bruce and Bob misunderstand the topic, than Nalimov writing the program the way they suggest. > >Any win preserving move by default will automatically reset the 50 move rule. > >Eventually, you will get to a state where x <= 99 - number of moves made so far >that apply to 50 move rule and you win. > >KarinsDad :) > >[snip]
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