Author: Vincent Diepeveen
Date: 01:06:13 08/31/00
Go up one level in this thread
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.
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