Author: Heiner Marxen
Date: 08:53:39 10/03/01
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On October 02, 2001 at 09:52:50, Paul wrote: >On October 02, 2001 at 08:41:20, leonid wrote: > >>[D]kq4BK/pq4QQ/2qq1P2/1NnqBnN1/3PpP2/2P2r2/RQ4qr/RQ4bb w - - >> >>I have said that this position is for "Champions" only having in mind that some >>people will try to solve it by brute force. Brute force is the only way to know >>minimal nomber of moves that lead to mate. But it could be not all the time >>easy. When I tried this position on two professional program, I was impressed. >>On Celeron 600Mhz, and with 1M of hash, one expected to solve position in around >>4000 years. Other, with no hash, after around 11000000000 years of thinking >>expected to recognize shortest mate. >> >>Please indicate your result. >> >>Thanks, >>Leonid. > >Hi Leonid, > >I just now started to look at both your positions, the simple one from yesterday >and this one, and I think you have a bit of a twisted nomenclature! > >This one is the simple one, the other one is more difficult. Even if this one >seems to be a mate in 12, and the other in 9. But maybe that's only the case for >Pretz, I'm curious about LLchess. > >For this one I find a mate in 12 in 3 seconds by applying some gentle force: > >00:03 WM12 12 Rxa7+ Q8xa7 Rxa7+ Kb8 Rxb7+ Nxb7 Qf8+ Qc8 Qxc8+ Kxc8 Nxd6+ Nfxd6 >Be6+ Kd8 Qb6+ Ke8 Bd7+ Kf8 Bxd6+ Nxd6 Qb8+ Nc8 Qxc8# Hi Leonid, Hi Paul! Since 1BELCT has finished, and my PC is reassembled, its time for a mate... :-) Chest confirms the above: Rxa7+ is the only key move for the shortest solution. It gives nearly the same PV: PV: Rxa7+ Q8xa7 Rxa7+ Kb8 Rxb7+ Nxb7 Qf8+ Qc8 Qxc8+ Kxc8 Nxd6+ Nfxd6 Be6+ Kd8 Qb6+ Ke8 Bd7+ Kf8 Bxd6+ Qxd6 Qxd6+ Nxd6 Ne6# (9.5 minutes on a K7/600 with 350 MB hash). Heiner >With colors switched it's a mate in 2 ... ;) > >Groetjes, >Paul
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