Author: Bruce Moreland
Date: 10:28:36 06/23/00
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On June 23, 2000 at 13:12:20, Bruce Moreland wrote: >On June 23, 2000 at 13:01:55, Dann Corbit wrote: > >>Here is WAC.230, for which the "right answer" is Rb4: >>[D] 2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - - acd 20; acn 175168255; acs >>1000; bm Rb4; ce 247; id "WAC.230"; pv Rh7 Rb1 a4 Ba3 Rh5 Kg4 Kd7 Bb2 Bb7 Ba3 >>Ba6 Bb4 Rh7 Ba3; >> >>But here we are after a4: >>[D] 2b5/1r6/2kBp1p1/3pP1P1/p1pP4/1pP3K1/1R3P2/8 w - - acd 21; acn 180101195; acs >>1001; ce -321; id "WAC.230 after a4"; pv Ba3 Rh7 Rb1 Rh5 Kg4 Bb7 Ra1 Kd7 Rb1 Kc7 >>Kf4 Kc6; >> >>And here we are after Rb4: >>[D] 2b5/8/2kBp1p1/p2pP1P1/1rpP4/1pP3K1/1R3P2/8 w - - acd 18; acn 183859758; acs >>1000; ce -233; id "WAC.230 after Rb4"; pv cxb4 a4 b5+ Kxb5 Rb1 c3 Ba3 Kc4 Kf4 >>Kxd4 f3 Kd3 Rd1+ Kc2 Rc1+ Kd2 Rh1 c2 Bb2 d4 Bxd4; >> >>And here we are after Rh7: >>[D] 2b5/7r/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 w - - acd 20; acn 174240961; acs >>1000; ce -321; id "WAC.230 after Rh7"; pv Rb1 a4 Kg4 Bb7 Bc5 Ba6 Ba3 Rh2 Kg3 Rh5 >>Kg4 Kd7 Bc5 Bb5 Rb2 Rh1 Ba3 Rh2 f3; >> >>It seems from a fairly deep evaluation that the 'aftermath' of both a4 and Rh7 >>is worse for white than after Rb4. So the burning question is, is everybody >>really positive that they have been getting the wrong answer all these years, or >>are we just wearing the emporor's new clothes? >>;-) >> >>Equivalently, are we really sure that a4 and Rb7 are not just as good or even >>superior? If not, why not? > >Are you analyzing these positions with your own mind or are you just letting a >computer look at them with a shallow search? > >The problem contends that black can't break through by normal means. Whit is >going to play Ba3 to blockade the a-pawn, and can prevent penetration on the >k-side. > >In the solution, black plays ... Rb4, threatening ... Ra4 and ... Ra2. If white >takes the rook, the pawns advance and win. > >Is anything you are saying challenging either aspect of this? > >bruce The only alternate plan that I can find is 1. ... Rh7 2. Rb1 and now it is possible to sacrifice with 2. ... b2 3. Rxb2 Rb7, which are beyond my skill to understand, at least while my wife is yelling at me to mow the lawn, but which seem a little challenging for white. It may be possible to delay playing ... b2. I'm not saying very much here, but I don't think your computer is doing any better. bruce
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