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Subject: Re: db - kaspa Rc7 versus Rc6

Author: Jeremiah Penery

Date: 10:04:58 01/17/00

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On January 17, 2000 at 12:55:07, Robert Hyatt wrote:

>On January 17, 2000 at 10:32:34, Vincent Diepeveen wrote:
>
>>Diep also plays Rc7 like deep blue,
>>
>>[d]6rk/1N3p1p/5q2/3Q4/3p4/PP1n1pPP/5P2/2R3K1 w - -
>>
>>I only see positional evaluation
>>difference between the moves Rc6 and Rc7 though.
>>
>>Score Rc7 even goes a bit lower at ply=17,
>>i saw diep starting at ply 18,
>>without getting a fail high for Rc6 at 17,
>>so this move passes at 17 ply.

<Diep analysis>

>The reason I mentioned this move was on the day of the game, we had several
>micros providing analysis.  None agreed with DB.  In 1997.

I think DB was definitely right.  I think the best white can get after Rc6 is a
draw, when Rc7 wins.
Here is some analysis of Rc6:

>1. Rc6 Rg5 2. Qe4 (but not Qc4 ? or Rc8+ ?) Qf4 [Amir]

2. ...Qe5 is better for black here.

After 3. Qxe5, black can give some problems with the d-pawn and attacking the
white king.

3. ...Rxe5 4. Rf6 Re1+ 5. Kh2 Kg7 6. Rf5 Nxf2 7. Rxf3 d3 8. Rxf2 Re2 9. Kg2 d2
10. Rxe2 d1=Q 11. Re3 Qd5+ 12. Kf2 Qxb7

I think black will win here, but it is more difficult than the other lines.

If 3. Qxf3, black also gets an attack on the white king. - 3. ...Nxf2 4. Qxf2
Rxg3+ 5. Kf1 Rxh3.

And now, 6. Qf6+ Qxf6 7. Rxf6 Rxb3 8. <some move> Rxa3, and now black has all
the chances, because white must capture all the black pawns just to get a drawn
KRNKR ending.

6. Rc8 Kg7, and now 7. Qg2+?! Rg3 8. Qf2 Rxb3.  Now what?  White goes
down.



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