Author: Bruce Moreland
Date: 17:18:16 10/08/98
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On October 08, 1998 at 08:35:03, Robert Hyatt wrote: >I'm not aware of any deep mates in KRB vs KR... this is generally a quick >draw... ditto for KRN vs KR. The mates are pretty rare in this opening, and >in setting up a few random ones, I couldn't create a single won position unless >I had the losing side set up hanging the rook immediately... There exists a 59-move conversion (or mate with no conversion) in KRB vs KR. This kind of thing is why FIDE rolled back the 50-move rule in this ending, which caused the professional players to go insane because they didn't want to go through extra moves of hellishness on the weaker side of this. This ending is actually quite difficult for the weaker side. It is one of the ones where you most certainly want to have a database vs humans, and continue playing with the stronger side, even in a drawn position. I haven't looked at the > 50 move winning positions in this ending. The one quoted in Batsford Chess Endings is: Kd6 Re2 Bc8 vs Ka8 Rh7 Batsford gives > 50 move wins in the following endings: QR vs Q (67) QP vs Q (59) Q vs BB (71) Q vs NN (63) RB vs R (59) RP vs R (60) BB vs N (66) NN vs P is not listed in the table in BCE, but it's also > 50. These are all endings where the 50-move rule could potentially wreck a position which is won, without this rule, with best play by both sides. SJE tables give mate in N, not distance to win, so these could be inferior to Thompson tables in some instances, which involve cases where you have a long mate. The Thompson table will capture something, mate, or convert, in the shortest time, while the SJE tables might not. I think the Thompson tables will also try to move a pawn but I'm not sure. They might not. bruce
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