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The Knightmate Challenge 2010
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H.G.Muller



Joined: 10 Mar 2006
Posts: 21015
Location: Amsterdam

PostPost subject: Re: The Knightmate Challenge 2010    Posted: Sat Jan 23, 2010 6:53 pm Reply to topic Reply with quote

Pure minimax does not care if you promote on the first move, or on the 6th. As long as you have the Queen in the end-leaf, you get the score for it. I guess here there is some funny kind of horizon effect in operation: If you promote early, the opponent's Royal Knight has more time to flee towards the center, which presumably increases black's score. If you promote late, he will be close to the corner in the end-leaf, as he must stay in the corner to defend against promotion.

So of all lines of equal depth that do not have the checkmate within the horizon, the ones where you postponed driving the opponent's Royal Knight out of the corner, and promote, until the last possible moment probably gets a better score. The (transient) price of promotion is that you let the Royal Knight escape to the center, and it tries to push that price over the horizon.

In my engines behavior like hat is discouraged through the delayed-loss bonus. I am not sure how others solve it.
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Subject Author Date/Time
The Knightmate Challenge 2010 H.G.Muller Mon Jan 04, 2010 11:22 am
      Re: The Knightmate Challenge 2010 H.G.Muller Mon Jan 04, 2010 4:26 pm
      Re: The Knightmate Challenge 2010 H.G.Muller Sun Jan 10, 2010 10:36 am
      Re: The Knightmate Challenge 2010 H.G.Muller Tue Jan 12, 2010 5:20 pm
      Re: The Knightmate Challenge 2010 H.G.Muller Thu Jan 14, 2010 6:27 pm
            Re: The Knightmate Challenge 2010 Jim Ablett Thu Jan 14, 2010 7:00 pm
      Re: The Knightmate Challenge 2010 Richard Allbert Thu Jan 14, 2010 7:18 pm
            Re: The Knightmate Challenge 2010 H.G.Muller Thu Jan 14, 2010 7:47 pm
                  Re: The Knightmate Challenge 2010 Richard Allbert Sat Jan 16, 2010 11:31 am
                  Re: The Knightmate Challenge 2010 Richard Allbert Sat Jan 16, 2010 12:07 pm
      Re: The Knightmate Challenge 2010 Richard Allbert Sat Jan 16, 2010 12:13 pm
            Re: The Knightmate Challenge 2010 Jim Ablett Sat Jan 16, 2010 1:24 pm
                  Re: The Knightmate Challenge 2010 Richard Allbert Sun Jan 17, 2010 11:20 am
      Re: The Knightmate Challenge 2010 H.G.Muller Mon Jan 18, 2010 10:43 pm
            Re: The Knightmate Challenge 2010 Richard Allbert Tue Jan 19, 2010 6:03 am
                  Re: The Knightmate Challenge 2010 H.G.Muller Tue Jan 19, 2010 7:31 am
                        Re: The Knightmate Challenge 2010 Richard Allbert Tue Jan 19, 2010 4:54 pm
      Re: The Knightmate Challenge 2010 H.G.Muller Fri Jan 22, 2010 1:31 pm
            Re: The Knightmate Challenge 2010 H.G.Muller Fri Jan 22, 2010 1:45 pm
            Re: The Knightmate Challenge 2010 H.G.Muller Fri Jan 22, 2010 2:17 pm
                  Re: The Knightmate Challenge 2010 Richard Allbert Sat Jan 23, 2010 3:19 pm
                  Re: The Knightmate Challenge 2010 Richard Allbert Sat Jan 23, 2010 4:09 pm
                        Re: The Knightmate Challenge 2010 H.G.Muller Sat Jan 23, 2010 6:53 pm
                              Re: The Knightmate Challenge 2010 Richard Allbert Sun Jan 24, 2010 10:05 am
                                    Re: The Knightmate Challenge 2010 H.G.Muller Sun Jan 24, 2010 11:23 am
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