Author: Mike Hood
Date: 17:37:27 02/25/03
Go up one level in this thread
On February 25, 2003 at 01:12:20, Mike Byrne wrote: >On February 24, 2003 at 09:59:12, Mike Hood wrote: > >>On February 23, 2003 at 16:23:16, Mike Byrne wrote: >> >>>Ruffian , among others, like Shredder 7, gets confused by this position, It >>>thinks it's mate in 18 for black and plays Kxd7 -- which, unfortunately leads to >>>a Mate in 18 for BLACK!. The problem here is that the EGTB does not recognizing >>>castling rights and the program is not examining them either. >>> >>>Proper play is Kd8 and black mates in 18 >>> >>>[d] 2k5/3P4/8/8/8/8/1r5p/R3K3 b Q - 0 1 >>> >>>Ruffian 1.0.1 analysis >>> >>>New game >>>2k5/3P4/8/8/8/8/1r5p/R3K3 b Q - 0 1 >>> >>>Analysis by Ruffian 1.0.1: >>> >>>1. -+ (-#17): 1...Kxd7 2.0-0-0+ Ke6 3.Kxb2 Kf5 >>>2. -+ (-#18): 1...Kd8 2.Ra8+ Kxd7 >>> >>>(Byrne, Secane, PA USA 23.02.2003) >>> >>>Proper Analysis: >>> >>> >>>If black plays Kxd7, then it is mate for white in 18 with 0-0-0 as shown by >>>Fritz 8. >>> >>> >>>[d]8/3k4/8/8/8/8/1r5p/R3K3 w Q - 0 1 >>> >>>Analysis by Fritz 8: >>> >>>1. +- (#18): 2.0-0-0+ Ke6 3.Kxb2 Ke5 4.Kc3 >>>2. -+ (-#16): 2.Ra7+ Kc6 3.Rh7 h1Q+ 4.Rxh1 Rb1+ >>> >>>(Byrne, Secane, PA USA 23.02.2003) >> >>Hey! Copyright infringement! >> >>It was me who devised this position, and I posted it in CCC on November 9th >>2001! (Topic: "Endgame Tablebase Problem without Castling") >> >>Oh well, it is a good position, but admittedly very unnatural. One of the >>parameters of Eugene's EGTBs is that there is no castling. This is a sensible >>limitation for 5-piece EGTBs, but by the time the first 20-piece EGTBs are >>generated Eugene might have to rewrite his code :) > >Nice work - I thought it was a thing of beauty. Now the question is - where I >did come across this position (and it wasn't here)? Aaron Tay put the position up on his web site for a while, so I suppose it has achieved some notoriety ;)
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