Author: Vincent Diepeveen
Date: 09:07:47 09/27/00
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On September 26, 2000 at 11:25:03, Steffen Jakob wrote: >Hi all! > >I ran the GMG3 endgame test suite with Hossa. Here is the position #13: >[D]5q2/6pk/p7/1p3PPK/1P2Q3/8/8/8 w > >The key move is 1.g6. > >After a while Hossa gave 1.f6 with a score of +10.47. I thought that maybe f6 is >a possible solution too. So I examined the PV of Hossa. It started with I tried with DIEP and it also gives a huge score for f6 +9.46 in DIEP's case, but still that's 7 pawns better as for g6. >1.f6 h7g8 2.e4e6 f8f7 3.e6xf7 g8xf7 4.f6xg7 f7xg7 5.g6 >which leads to this position: > >[D]8/6k1/p5P1/1p5K/1P6/8/8/8 b > >Here Hossa continued with 5... Kf6 which is indeed losing. All moves seem to be >losing here. But when I forced 5... b5 6. bxa5 Hossa gave a score of mate in 54! idem here of course >How is this such a position handled in tournament chess? Is this a draw (I think >the rules have changed here several times?!)? If it's a draw then I will change >my tablebase probe code to return a draw score if the mate distance is > 50. tournament rules are very complicated and simpel at the same time. First of all you can't claim it before you have 50 moves done, which is more important as people realize, and that means for this position that there are no captures and pawn moves for 50 moves in a row. In this position still a lot of pawn moves to go. Secondly i can't imagine that a KQP KQ is somehow over 50 moves in *any* positions without touching a pawn in between. When looking to this position it's obvious that white needs to promote the pawn first before white can win, so no worries about 50 move rule here at all. In general the only 5 men which might get on the board in a game where you need to fear 50 move rule before you mate opponent is KNNKP. Other positions don't come to mind real soon, though there probably are a few cases. >Best wishes, >Steffen.
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