Author: Terry Ripple
Date: 11:58:02 05/29/02
Go up one level in this thread
On May 29, 2002 at 09:40:58, Tony Werten wrote: >On May 29, 2002 at 09:37:20, Harald Faber wrote: > >>On May 29, 2002 at 02:34:34, Robin Smith wrote: >> >>>The position is easily winning for white. But tablebases cause programs to want >>>to play 1.Rxf5?? after which there is a tablebase mate in 65 .... except the 50 >>>move rule kicks in first and the game ends up a draw. Are there any programs >>>that avoid this type of blunder? [D] 5k2/3K4/8/R4b2/1R6/8/3B4/5r2 w - - 0 1 >> >>Sorry, I don't get the point here. I don't see '??' after 1.Rxf5 when the >>exchange leads to #65. And concerning the 50 move rule: There are several >>exceptions which allow more than 50 moves to mate. Your example with KRB<->KR is >>one of the exceptions IIRC. > >Not anymore. All the exceptions have been discarded. 50 move rule is as it was >before tablebases questioned it. So this checkmate in 65 is a draw. > >BTW XiniX says Kd6 solves the problem. > >Tony ---------------- Explain why are all exceptions to the 50 move rule discarded? Why is the 50 move rule is as it was before tablebases questioned it? Here is the analysis from my 5-man tablebases and so what is wrong with this if there are exceptions to the 50-move rule according to USCF? [D]5k2/3K4/8/R4b2/1R6/8/3B4/5r2 w - - 0 1 1.Rxf5+ Rxf5 2.Ke6 Rc5 3.Bh6+ Kg8 4.Rg4+ Kh7 5.Bf4 Rb5 6.Be3 Rb3 7.Kf7 Rb7+ 8.Kf6 Rb3 9.Rg7+ Kh8 10.Re7 Rc3 11.Bf4 Rc6+ 12.Kf7 Ra6 13.Be3 Rc6 14.Ra7 Kh7 15.Rd7 Rc8 16.Bg5 Rb8 17.Rd1 Rb7+ 18.Be7 Rb6 19.Bd6 Rb7+ 20.Kf6 Rb3 21.Rh1+ Kg8 22.Rg1+ Kh7 23.Rg7+ Kh8 24.Rd7 Rb2 25.Bc5 Rc2 26.Rd5 Rc3 27.Bd6 Rc1 28.Rh5+ Kg8 29.Be5 Rb1 30.Rg5+ Kh7 31.Rg7+ Kh8 32.Ra7 Rb6+ 33.Kf7+ Kh7 34.Bf4 Rb4 35.Kf6+ Kh8 36.Ra8+ Kh7 37.Be5 Rb1 38.Ra7+ Kg8 39.Bd4 Rf1+ 40.Ke6 Rf7 41.Ra2 Rf8 42.Rh2 Re8+ 43.Kf6 Re1 44.Rg2+ Kf8 45.Be5 Rf1+ 46.Ke6 Ke8 47.Rg7 Rf2 48.Rh7 Rf1 49.Rc7 Rd1 50.Bc3 Rd3 51.Bf6 Re3+ 52.Be5 Rd3 53.Re7+ Kd8 54.Rg7 Kc8 55.Rc7+ Kd8 56.Rc4 Re3 57.Rb4 Rxe5+ 58.Kxe5 Kc7 59.Kd5 Kd7 60.Rb7+ Kc8 61.Rg7 Kd8 62.Ke6 Kc8 63.Kd6 Kb8 64.Kc6 Ka8 65.Kb6 Kb8 66.Rg8# 1-0 Best Regards, Terry
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