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Subject: Re: Endgame Exchange Sac by Junior 6

Author: Len Eisner

Date: 21:58:38 03/03/00

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On March 04, 2000 at 00:46:38, Len Eisner wrote:

>On March 03, 2000 at 20:25:37, Paulo Soares wrote:
>
>>On March 03, 2000 at 15:44:14, José Antônio Fabiano Mendes wrote:
>>
>>>On March 02, 2000 at 23:28:15, Paulo Soares wrote:
>>>
>>>>On March 02, 2000 at 18:30:52, Len Eisner wrote:
>>>>
>>>>>On March 02, 2000 at 14:16:04, Paulo Soares wrote:
>>>>>
>>>>>>On March 01, 2000 at 22:35:33, Len Eisner wrote:
>>>>>>
>>>>>>>[D]6bk/8/7P/p7/1p1R4/r2B1PP1/6K1/8 b - - 0 45
>>>>>>>
>>>>>>>Junior 6 played Rxd3! against Hiarcs 7.32 in a 5/3 blitz game on my PIII 500.
>>>>>>>It’s a nice exchange sac that wins by force by queening one of the passed pawns.
>>>>>>>
>>>>>>>Len
>>>>>>
>>>>>>I didn't get to find a winner line for black. Below a possible
>>>>>>variant(the best?):
>>>>>>
>>>>>>1... Rxd3 2. Rxd3 b3 3. h7 Bc4 4. Rd4 a4 5. Rxc4
>>>>>>a3 6. Rb4 a2 7. Rxb3 a1=Q 8. Re3 Kxh7 9. Kf2
>>>>>>
>>>>>>Paulo Soares, from Brazil
>>>>>
>>>>>In the game Junior 6 played Kxh7 instead of Bc4 in your line.  Here’s how it
>>>>>went from the position in the diagram:
>>>>>
>>>>>1...Rxd3 2. Rxd3 b3 3. h7 Kxh7 4. Rd7+ Kh6 5. Ra7 Bh7 6. Ra6+ Kg7 7. Rb6 Bc2 8.
>>>>>Rb7+ Kf6 9. Rb6+ Ke7 10. Rb7+ Kd6 11. Kf2 a4 12. Ke3 a3 13. Kd2 a2 14. Ra7 b2
>>>>>15. Rxa2 b1Q 16. Rxc2 Qg1 17. Rc3 Qxg3 and black wins.
>>>>>
>>>>>I guess it’s possible for white to save the game, but I don’t see how.
>>>>>
>>>>>Len
>>>>
>>>>I believe that, following the line of the game, 6. Rxa5 are better than 6. Ra6+.
>>>>All the analyses were made with the help of a program.
>>>>
>>>>1... Rxd3 2. Rxd3 b3 3. h7 Kxh7 4. Rd7+ Kh6 5. Ra7 Bh7 6. Rxa5
>>>>Bd3 (6... b2 7. Rb5=) 7. Ra3 b2 8. Rb3 b1=Q 9. Rxb1 Bxb1=
>>>>
>>>>Paulo Soares
>>>
>>>Instead of 5...Bh7,Black should play 5...Bc4.Now White can neither
>>>take the a-pawn[6.Rxa5 b2] nor check the Black king.Most likely
>>>Black has a win here.  JAFM
>>
>>I believe that, same having other interesting variants,
>>white draw after 5... Bc4 6. Rb7.
>>
>>1... Rxd3 2. Rxd3 b3 3. h7 Kxh7 4. Rd7+ Kh6 5. Ra7 Bc4 6. Rb7 a4 7.
>>Rb4 a3 8. Rxc4 a2 9. Ra4 b2 10. Rxa2 b1=Q 11. Re2
>>
>>The position now is similar to the final position of the first variant
>>that I placed (message 99888) and I don't know as black can win.
>>
>>Paulo Soares.
>
>Good analysis by both of you.  For continuity, here’s a diagram of the final
>position in the above line.
>
>[D]8/8/7k/8/8/5PP1/4R1K1/1q6 b - - 0 54
>
>I agree this position is drawn.  As an experiment, I removed the white pawns one
>at a time to get into the 5-piece tablebase.  Interestingly, if you remove the f
>pawn the position is drawn, but if you remove the g pawn, it’s mate in 60!
>
>Anyway, I think black may have some winning chances by playing 8…b2 instead of
>8…a2 as in the above line.  By pushing the b pawn, I think black makes it harder
>for white to sac the rook in a way that draws.
>
>I’m currently analyzing the position after b2 with Junior 6.
>
>Len

Oops.  I meant to say that by pusing the b pawn it makes it harder for white to
capture one of the black pawns in a way that draws.

Len



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