Author: John Merlino
Date: 16:44:38 07/01/05
Go up one level in this thread
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. 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
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.