Author: KarinsDad
Date: 13:19:39 04/22/99
Go up one level in this thread
On April 22, 1999 at 15:46:27, Jeremiah Penery wrote: >On April 22, 1999 at 14:45:19, Steve Coladonato wrote: > >> >>On April 22, 1999 at 14:26:24, Jeremiah Penery wrote: >> >>>On April 22, 1999 at 13:05:04, Steve Coladonato wrote: >>> >>>>At one time, there was a rule in chess that in the case of a known forced mate a >>>>player was allowed the standard 50 move rule or twice the number of moves with >>>>best play to execute the mate. The KNB vs K ending is a 34 move ending with >>>>best play. Therefore a player was allowed 68 moves to effect the mate. Does >>>>anyone know if this rule is still in effect? >>> >>>Can you post a position for this? The longest ending of this type that I've >>>seen is something right around 50 moves. (The losing king is in the wrong >>>corner) >> >>The 34 moves was from any position on the board. I'm sure that there are many >>positions which do not require the full 34 moves and a few which would. Which >>positions would require the 34 moves, I don't know. >> >>I haven't seen any documentation on this in recent books but back in the 70's >>there was quite a bit available. Unfortunately, I don't have any of those old >>books around. I think the basic mates were as follows: >> >>KQ v K - 9 moves >>KR v K - 12 moves >>KBB v K - 20 moves >>KNB v K - 34 moves >> >>Again, from any position on the board, mate could be accomplished within the >>number of moves above with best play. > >Ok...Perhaps you're thinking that 34 moves (68 ply) is surpassing the 50 move >rule, but it isn't. 50 moves (100 ply) is needed for that. There are no KBN >vs. K endings that take so many. Actually, I do not think that is what Steve was saying. He was thinking that there was a rule which allowed you to double the number of moves allowed in the 50 move rule for special case endings. For example, if the maximum number of moves required for KBBBK (I am just making this up as an example) was 47 per side, then the 50 move rule would be extended to 94 moves (per side). There are some positions that require more than 50 moves with best play, but all of the current USCF and FIDE rules allow a claim of a draw after 50 moves from both sides where a pawn has not been pushed and a piece has not been taken, regardless of which pieces are on the board. I am not aware that the rules were ever changed to reflect anything else (since the inception of the 50 move rule), but that it was only considered (to my knowledge). If it was ever changed, it is not in effect now. KarinsDad :)
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