Author: Robert Hyatt
Date: 06:31:15 08/31/00
Go up one level in this thread
On August 31, 2000 at 04:06:13, Vincent Diepeveen wrote: >On August 30, 2000 at 10:03:53, Robert Hyatt wrote: > >>On August 30, 2000 at 09:32:28, Larry Griffiths wrote: >> >>>On August 30, 2000 at 08:59:51, Michel Langeveld wrote: >>> >>>>On August 30, 2000 at 08:35:26, Larry Griffiths wrote: >>>> >>>>>I am testing the following WAC position... >>>>> >>>>>[D]8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - - bm Rxb2; id "WAC002"; >>>>> >>>>>My program keeps picking c3 so I figure it has a bug some where. >>>>> >>>>>What is the principle contiunation after Rxb2. I figure that it promotes a pawn >>>>>somehow. >>>>> >>>>>Larry :) >>>> >>>>The folowing data is in CAP: >>>> >>>> >>>>D:\>grep -i "8\/7p\/5k2\/5p2\/p1p2P2\/Pr1pPK2\/1P1R3P\/8" cap.epd >>>> >>>>8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - - acd 14; acn 114206936; ce 322; pv Rxb >>>>2 Rxb2 c3 Rb6+ Ke7 Rb7+ Kd6 Rb6+ Kc5 Rb7 c2 Rxh7 d2 Rc7+ Kd6 Rxc2 d1=Q+ Re2 Qf1+ >>>> Rf2 Qd3 h4 Qxa3; pm Rxb2; bm Rxb2; id "WAC.002"; >>> >>>It looks like I must run this to 17 or 18 plys deep then. I thought the >>>promotion might occur before 17 or 18 plys. >>> >>>Thanks. >>>Larry :) >> >> >>If you do any kind of search extensions, you ought to pick the solution up >>at 11-12-13 plies or so. The problem is all the checks by white, after >>black gets the unstoppable pawns. A program can use those to push the >>promotion off a long way... > >About 14 ply with check extensions and promotions in qsearch. >Less if you do passed pawn extensions. Problem of evaluation here is >that king is in quadrant but hindered by pawn at e3, otherwise white >wins easily here after Rxb2. I have always solved this one at 12 plies tactically, although I get it much quicker due to evaluation... The main problem is all the checks by white after the rook sacrifice by black, which holds off the impending promotion for a good while.
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