Author: Dave Gomboc
Date: 18:05:23 09/09/01
Go up one level in this thread
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!
>
>37. Bxd3 cxd3 38. c4 Bxa4 39. bxa4 Bd4+! {not d5}
>40. Kh1 {forced} Rc7
>
>now white has several options
>
>41. Rxd3 Rxc4 42. Be5 Rb1
>
>now black has two winners
>
>43. Rcxa4
>
>white is lost now, the checking sequence at the last
>rows only serves to improve blacks position and grabbing
>the h7 pawn doesn't help
>
>43. f4!
>
>Oh the irony. The bishop is trapped.
Something got screwed up in the last few moves, I guess you mean 42.Bg5 Be5
43.Rb1 Rcxa4 or 43...f4 (trapped? sorry, my machine is slow by today's
standards! :-)
>I get scores around +1.5 in favor of black here on all
>variations, so it's perfectly possible DT would grade this
>as +2.
>
>--
>GCP
Okay, for convenience, we're looking at
32.Bg5 Bg7 33.Bf4 c4 34.Re2 Bd7 35.Rd1 Bb5 36.Ree1 Nd3 37.Bxd3 cxd3 38.c4 Bxa4
39.bxa4 Bd4+ 40.Kh1 Rc7 41.Rxd3 Rxc4 42.Bg5 Be5 43.Rb1 Rcxa4
I booted up Deep Junior 6.0, and followed the checks...
44.Rb8+ Kf7 45.Rb7+ Ke8 46.Rxh7 Rxa2
47.g3 Ra1+ 48.Kg2 R6a2+ 49.Kh3
[D]4k3/7R/3p2p1/4bpB1/8/3R2PK/r6P/r7 b - - 0 1
Analysis by Deep Junior 6.0:
µ (-0.89) depth: 15 00:00:03 283kN
49...Rb1 50.Rd2 Rxd2 51.Bxd2 d5 52.Bg5 Kf8
µ (-0.83) depth: 18 00:00:32 10714kN
49...Rb1 50.Rd2 Rxd2 51.Bxd2 d5 52.Bg5 Kf8 53.Re7 Re1 54.Re6 Bxg3 55.Rf6+ Kg7
56.hxg3 Rh1+ 57.Kg2 Rh5 58.Rd6 Rxg5
µ (-0.77) depth: 19 00:04:21 109930kN
Is this a won position for Black? DJ6 doesn't seem to think so, but it might
just be wrong...
49...Rb1 50.Rd2 Rxd2 51.Bxd2 Bf6 and DJ is scoring a search from here as -1.0.
Back to 47.Kg1 Ra1+ 48.Kf2 R6a2+ 49.Rd2 Bf6 50.Bh6 g5 51.Rxa2 Rxa2, also -1.0.
I suspect that 46.Re7+ Kf8 47.Rb3 Ra8 48.Rxh7 Rxa2 49.g3 is about the same.
46.Rdb3 Ra7 47.Rxh7 Rxh7 48.Rb8+ Kd7 49.Rb7+ Ke6 50.Rxh7 f4 doesn't look like it
does White any favours.
42.Bh6 Bg7 43.Bxg7 Kxg7 might just be a draw, though. Hmm, 42...Rcxa4, I guess,
then it's similar to before.
I don't know, GCP, I don't think these pawn up endings deserve +2.25. But in
order for DT2 to settle on that kind of score, if it got to these variations it
must have assessed them as such.
Dave
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