Author: Ricardo Gibert
Date: 18:13:34 07/01/05
Go up one level in this thread
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.
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