Author: John Merlino
Date: 16:03:41 09/13/03
Go up one level in this thread
On September 13, 2003 at 18:00:18, Rafael Andrist wrote: >On September 13, 2003 at 14:34:26, John Merlino wrote: > >>On September 13, 2003 at 14:31:55, Rafael Andrist wrote: >> >>>On September 13, 2003 at 14:08:37, John Merlino wrote: >>> >>>>On September 13, 2003 at 10:23:41, Frank Phillips wrote: >>>> >>>>>[D]8/4k3/8/8/4Kp1p/5N1N/8/8 w - - >>>>> >>>>>Just an amusing position. >>>>> >>>>>White to move and win. Perhaps the longest forced mate my program has played. >>>>>I was not sure whether it would be caught out by the 50 moves rule. (Any credit >>>>>goes to Eugene of course.). >>>>> >>>>>It traded down from B+Pawns versus 2N+Pawns to reach this endgame. My heart >>>>>sank and I was already to fix yet another evaluation quirk - maybe still need >>>>>to. >>>>> >>>>>Frank >>>> >>>>Kxf4 is a forced mate in 90 moves and it will NOT be caught by the 50-move rule. >>> >>>No, after Kxf4 it is a draw. You need 51 moves to the next forced capture/pawn >>>push with best defence. >>> >>>Also, I did a short search up to depth 13 and could not find a win which would >>>not have been prohibited by the 50-move rule. >>> >>>The endgame is anyway only won in about 23% of all cases and even then, you will >>>fail to win it in more than 50% without the appropriate endgame tables. >>> >>>regards >>>Rafael B. Andrist >> >>You're probably right, since Black has many options. But can you prove it by >>posting the moves? > >What kind of moves are you interested in? The optimal line of play or optimal >defense vs. DTM attacker? Basically, I wanted the information that Dieter provided. Is it possible for Black to force a 50-move rule draw? Dieter wrote a minimax algorithm that showed that Black could force the draw. He didn't provide the line, though.... jm
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