Author: Dann Corbit
Date: 11:33:49 06/23/00
Go up one level in this thread
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
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