Author: John Merlino
Date: 18:30:06 07/01/05
Go up one level in this thread
On July 01, 2005 at 21:20:04, Ricardo Gibert wrote: >On July 01, 2005 at 21:13:34, Ricardo Gibert wrote: > >>On July 01, 2005 at 19:44:38, John Merlino wrote: >> >>>On July 01, 2005 at 19:23:33, Marc D wrote: >>> >>>>[D]R7/2r2k2/p5P1/1p6/1P4N1/1KB5/P5r1/8 b - - 0 38 >>>> >>>>This was a game between Sikula(2457)and Blaszik(1964) >>>> >>>>Why did black (have to) resign? >>>> >>>>Wondering >>>>Marc >>> >>>38...Ke7 is forced. (If 38...Kxg6 39.Rg8+ and Black will lose his g2 Rook -- if >>>38...Ke6 39.Rxa6 and things go downhill from there.) >>> >>>So, after 38...Ke7 39.Ne3 Rxg6 40.Nd5+ Kd7 41.Nxc7 Kxc7 appears to be forced >>>also, and now White is up a piece. >> >>Or 39.b7 Rg3 40.b8=Q (or 40.Re8+ Kd6 41.Ne3 +-) Rgxc3+ 41.Kb2 Rc2+ 42.Ka3 R2c3+ >>43.Qb3 +- >> >>> >>>However, I would say that Black might have resigned a bit prematurely. Here's >>>now CM9_R1 analyzes the position after 41...Kxc7 on a P4-2.4: >>> >>>Time Depth Score Positions Moves >>>0:00 1/3 4.09 1819 42.Ra7+ Kb8 43.Rg7 Rd6 44.Be5 >>>0:00 1/4 4.02 4433 42.Ra7+ Kb8 43.Rf7 Rg3 44.Rg7 Rf3 >>>0:00 1/5 4.03 11191 42.Ra7+ Kb8 43.Rg7 Re6 44.Bd4 Kc8 >>> 45.Ra7 >>>0:00 1/6 4.01 23331 42.Ra7+ Kb8 43.Rg7 Re6 44.Bd4 Kc8 >>> 45.Ra7 Re4 >>>0:00 1/7 4.01 62256 42.Ra7+ Kb8 43.Rg7 Re6 44.Bd4 Kc8 >>> 45.Ra7 Re4 >>>0:00 1/8 4.01 105025 42.Ra7+ Kb8 43.Re7 Rg3 44.Kc2 Rg2+ >>> 45.Bd2 Rf2 46.Kd3 Kc8 >>>0:00 2/9 4.00 223515 42.Ra7+ Kb8 43.Re7 Rg3 44.Kc2 Rg2+ >>> 45.Bd2 Rf2 46.Kd3 Kc8 47.Re6 Kb7 >>>0:01 3/10 4.02 416349 42.Ra7+ Kb8 43.Rg7 Rxg7 44.Bxg7 >>> a5 45.a3 Kc8 46.Kc3 axb4+ 47.axb4 >>> Kd7 48.Kd4 Ke6 >>>0:02 4/11 4.02 779384 42.Ra7+ Kb8 43.Rg7 Rxg7 44.Bxg7 >>> a5 45.a3 Kc8 46.Kc3 axb4+ 47.axb4 >>> Kd7 48.Kd4 Ke6 >>>0:04 5/12 4.02 1661790 42.Ra7+ Kb8 43.Rg7 Rxg7 44.Bxg7 >>> a5 45.a3 Kc8 46.Kc3 axb4+ 47.axb4 >>> Kd7 48.Kd4 Ke6 49.Ke4 >>>0:11 6/13 4.02 4561574 42.Ra7+ Kb8 43.Rg7 Re6 44.Bd4 Rh6 >>> 45.Be5+ Kc8 46.Ra7 Rh5 47.Bc3 Rh6 >>> 48.a3 Rd6 49.Kc2 >>>0:32 7/14 4.06 13084424 42.Ra7+ Kb8 43.Rg7 Re6 44.Bd4 Rh6 >>> 45.Be5+ Kc8 46.Ra7 Rh5 47.Bc3 Rh6 >>> 48.a3 Re6 49.Kc2 Rd6 >>>1:30 8/15 4.05 37211374 42.Ra7+ Kb8 43.Rg7 Rh6 44.a4 Rh5 >>> 45.a5 Rd5 46.Kc2 Kc8 47.Rg6 Kb7 >>> 48.Rb6+ Ka7 49.Rf6 Rd7 50.Be5 Kb7 >>> >>>Note that in the final PV, Black has not made any progress, and the eval is >>>pretty much steady through all depths. This looks to me like one of those >>>situations where engines give a high score to the side with the material >>>advantage, but the position might be a theoretical draw. >>> >>>jm >> >>There is no "might be a theoretical draw." This is one of those positions where >>computer do poorly, because they can't plan. The win is long winded, but not in >>doubt. > >Look at it this way. If that R+B+Ps vs R+Ps ending were really drawn, it would >be famous and we would all know about it. I'm not saying that ALL R+B+PP vs R+PP is drawn. I just don't know. I would just like someone to show me that THIS game is won for White. jm
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.