Author: Dave Gomboc
Date: 21:48:34 09/09/01
Go up one level in this thread
On September 09, 2001 at 21:05:23, Dave Gomboc wrote: >On September 09, 2001 at 19:01:48, Gian-Carlo Pascutto wrote: > >>On September 09, 2001 at 18:30:17, Dave Gomboc wrote: >> >>>On September 09, 2001 at 16:53:56, Roy Eassa wrote: >>> >>>>On September 09, 2001 at 15:45:08, Dave Gomboc wrote: >>>> >>>>>34. Re2 doesn't look that great, but even in your line: >>>>> >>>>>>32.Bg5 Bg7 33.Bf4 c4 34.Re2 Bd7 35.Rd1 Bb5 36.Ree1 Bxa4 37.bxa4 Rb2 >>>>>>38.Rd2 Rxa2 39.Bxf5 >>>>> >>>>>39.Bxf5 Rxd2 40.Bxe6 Kf8 41.Bxd2 Rxa4 =/+ >>>>> >>>>>White is down a pawn but has the bishop pair as compensation. This looks like a >>>>>draw with best play, so it's completely unconvincing as an attempt for an >>>>>advantage worthy of +2.xx. >>>> >>>> >>>>How about against 38... Kf8!, which I think is better for Black than ...Rxa2. >>> >>>Hmm... that move looks interesting. >>> >>>39. Rc1 Rxa2 40.Bd1 Rxd2 41.Bxd2 Nd3 42.Rb1 Be5 43.Bc2 Nc5 44.Rb4 d5 >>> >>>This is starting to look like a pawn up for Black. Hmm. But would DT2 have >>>given a static evaluation >2 to this position? Seems unlikely to me... what do >>>you think? >> >>Black has better earlier on: >> >>Instead of 36. .. Bxa4 first 36. .. Nd3! It looks like White also has better earlier on: 36.Bxe5! Nxe5 37.Rxe5 Bxa4 38.Re6 cxb3 39.Bxb3 Bxb3 40.axb3 Rxb3 41.Rexd6 Rxd6 42.Rxd6 Rxc3 is just a draw (Fine, Basic Chess Endings, pg. 372). Black can also try 37...dxe5!, then 38.Nc5 Rxa2 39.Nxb7 Rxc2 40.Nd6 cxb3 41.Nxb5 b2 42.Na3 Rxc3 43.Nb1 Rc1 44.Rf1 e4 45.Kf2 looks winning for Black, but I'm not completely positive. This is definitely the critical position of the variation. Uri, take note of all the singular moves in this variation. Actually, there's some dual happening: 42.Rf1 e4 43.Na3 Rxc3 44.Nb1 Rc1 45.Kf2 is a transposition. As I back up in this variation, I notice an ugly Deep Junior 6.0 preprocessing artifact: searching from move 42 gives -1.34, but searching from move 41 (after searching move 42) gives -0.74, with Nxb5 b2 leading to the hash hit. Ah, good, just as I was about to move on it searched far enough that its preprocessing happened deep enough in the tree that it resolved to -1.3 again. At least, I think it's preprocessing, but it might be some other search anomaly. I suppose I could sit down and check it out, but I'd rather not get sidetracked at the moment. 36.Bxe5 Nxe5 37.Rxe5 dxe5 38.Nc5 Rxa2 39.Bb1 Rba7 40.Bxa2 Rxa2 41.b4 Rc2 42.Rd6 Rxc3 43.Rb6 Be8 44.Re6, picking up the e-pawn, isn't adequate, and I can easily believe a +2.xx score here. But 36.Bxe5! Nxe5 37.Nc5! Bxh2+ 38.Kxh2 dxc5 39.a4 Bc6 40.Rd6 cxb3 41.Bd3 b2 42.Re1 b1Q 43.Rxb1 Rxb1 44.Bxb1 is unclear, while after 40.Re6 Kf7 41.Rde1 cxb3 42.Bd3 Bb5 43.axb5 Rxe6 44.Bc4 Rbb6 45.Bxb3 White should be able to hold the rook ending. Meanwhile, 40.Re6 Kf7 41.Rde1 Rxd7 42.b4 cxb4 43.cxb4 Rb7 44.Bd1 Rxb4 45.Bf3 Bxf3 46.Rxa6 Rb2 is wild!, I'll let someone with a faster machine handle that variation (there may be good deviations for either side along the way too). If something refutes this line, it's probably this. This leaves 36.Bxe5! Nxe5 37.Nc5! dxc5 38.Rxe5 Rxa2 39.bxc4 Bxc4 40.Rxc5 which looks like White should be able to grovel a draw here too. With the unsafe assumption that the wild line holds up for White, 32.Bg5 is still in business as an improvement over 32.Re1. So far it looks to be good enough that Black shouldn't be able to conclude that it's over 2 pawns up. Dave
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