Author: Peter McKenzie
Date: 14:54:57 09/07/01
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On September 07, 2001 at 16:03:43, Mike S. wrote: <snip> >Thanks for pointing that out. This is really a basic requirement for a >reasonable test position - although very difficult to achieve for positional >tests. Yes, and positional tests are very useful so its a good challenge. > >But for the endgame, I think I can provide a few good ones (some may have been >included in test suites, which I don't know because there are so many test >suites :o). I searched my collection of test suites (most of the popular ones, plus a few more) and your positions aren't in them. I like those positions you posted, thanks I think I will use them all! The Geller position is nice technique in action. The study is nice trickery, and I suspect it will help authors find bugs in their engines. Probably tablebases help alot there, but not everyone has them. [D]7k/7p/1p4p1/n2p4/1K1p3R/2NB4/3Q1P2/q1r5 w - - 0 36 This perpetual looks quite hard, perhaps someone could try to validate that it is sound? Does the B have to be accepted? I haven't had time to have a good look at it yet. Perpetuals are not uncommon in endgames with queens on, so this should be a good test. cheers, Peter >36.Rxh7+ > >White escapes with a perpetual. The game continued 36.Rxh7+!! 36...Kxh7 37.Bxg6+ >Kxg6 38.Qd3+ Kg7 39.Qxd4+ Kg6 40.Qg4+ Kf6 41.Qf4+ Ke6 42.Qg4+ Kf7 43.Qf4+ Ke8 >44.Qe5+ Kd7 45.Qxd5+ Kc8 46.Qe6+ Kb7 47.Qd7+ Kb8 48.Qe8+ Ka7 49.Nb5+ Kb7 50.Nd6+ >Ka7 51.Nb5+ Kb7 52.Nd6+ Ka7 53.Nb5+ Draw ½-½ > >Regards, >M.Scheidl
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