Author: Roy Eassa
Date: 11:35:41 04/28/02
Go up one level in this thread
On April 28, 2002 at 14:17:54, John Merlino wrote: >On April 28, 2002 at 01:19:27, Uri Blass wrote: > >>On April 27, 2002 at 18:41:28, John Merlino wrote: >> >>>On April 27, 2002 at 18:12:27, Uri Blass wrote: >>> >>>>The following position is from my last game >>>> >>>>[D]6k1/RR4p1/5p1p/4p3/8/P7/4rrPP/3K4 b - - 0 31 >>>> >>>>I played 31...Rxg2 and after 32.a4 Ra2 my opponent resigned. >>>> >>>> >>>> >>>>After the game he said that he needed one more tempo. >>>> >>>>I said that I was lucky because I saw the idea of Rxg7+ that almost win the game >>>>only after I played 31...Rxg2. >>>> >>>>I played 31...Rxg2 fast because the move seemed to be almost forced(I did not >>>>like the idea of Rd2+ Kc1 and the idea of Ra2 with the double mate threat is >>>>gone) >>>> >>>>I also said in the anlaysis that the best was still 32.Rxg7+ Rxg7 33.Ra8+ >>>>inspite of the fact that white is losing after 33...Kf7 34.Kxe2 Rg2+ because in >>>>the worst case black will need to sacrifice the rook for the a pawn when the >>>>black passed pawns are going to be srtronger than the rook. >>>> >>>> >>>>I find that some top programs cannot find 31...Rxg2 >>>>for black because they do not evaluate correctly the pawn endgame. >>>> >>>> >>>>Uri >>> >>>It takes Chessmaster 9000 (pre-Beta) 2:05 on a PIII-600 to see Rxg2, but about a >>>minute later it discards it for Rd2+ (which turns out to be two checking moves >>>to force the White King farther away from the Black pawns BEFORE taking on g2): >> >>The problem is that the line that chessmaster suggests is not forced. >> >>31...Rd2+ 32.Kc1 Rc2+ 33.Kb1 Rxg2 34.Rxg7+ is not a forced line from white point >>of view. >> >>White can choose 32.Ke1 >> >>Uri > >Well, maybe not "forced", but, according to CM, 31...Rd2+ 32.Ke1 leads to this >(with an eval that is instantly about 1.50 worse for White than if 32.Kc1): > >Time Depth Score Positions Moves >0:00 1/3 -2.51 2176 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rgf2+ > 35.Kg1 >0:00 1/4 -2.49 6886 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Re2+ 36.Kd1 >0:00 2/5 -2.42 32451 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Ra2 36.Kf1 f5 37.a5 Rgf2+ > 38.Ke1 >0:01 3/6 -2.46 79710 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Ra2 36.Kf1 Kh8 37.h4 Rgf2+ > 38.Ke1 Rfe2+ 39.Kf1 >0:03 4/7 -2.50 269671 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Ra2 36.Kf1 Rg4 37.h3 Rf4+ > 38.Ke1 Re4+ 39.Kf1 >0:08 5/8 -2.54 756383 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Ra2 36.Kf1 Kh8 37.h4 Rgc2 > 38.Rb1 Kh7 39.h5 >0:27 6/9 -2.44 2437336 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Ra2 36.Kf1 Kh8 37.Ra8+ Kh7 > 38.Raa7 Raf2+ 39.Ke1 Rc2 40.Kf1 > Rg4 41.h3 Rf4+ 42.Ke1 >1:26 7/10 -2.71 8085064 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Ra2 36.Kf1 Kh8 37.Ra8+ Kh7 > 38.Raa7 e4 39.Re7 e3 40.Rxe3 Rxh2 > 41.Kg1 Kg6 >4:38 8/11 -2.81 26452346 32...Rfe2+ 33.Kf1 Rxg2 34.a4 Rdf2+ > 35.Ke1 Ra2 36.Kf1 Kh8 37.Ra8+ Kh7 > 38.Raa7 h5 39.Rd7 Rgc2 40.Ke1 Kg6 > 41.a5 Kf5 > >It probably all leads to the same loss, anyway.... > >jm It DOES matter, though, because it affects what is the "best" move. It seems that it is indeed best to do the two checking moves first (pushing the king away), THEN take the pawn. I.e., Rxg2 is NOT the best first move.
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