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Study of Kasparián refuted ?



 
 
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  #1  
Old August 4th 03, 10:19 PM
JMR
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Default Study of Kasparián refuted ?

Is this study correct ?

Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :

White :
King b3
Knight b7
Bishop g2
Pawns a2,c5

Black :
King c8
Knight d7
Bishop h4
Pawns a7,a6 and c7


1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6 I
do'nt see how to win neither Fritz !


  #2  
Old August 5th 03, 12:08 AM
Antonio Torrecillas
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Default Study of Kasparián refuted ?

En/na JMR ha escrit:
Is this study correct ?

Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :

White :
King b3
Knight b7
Bishop g2
Pawns a2,c5

Black :
King c8
Knight d7
Bishop h4
Pawns a7,a6 and c7


1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6 I
do'nt see how to win neither Fritz !


Easy, .. Bf1-b5 followed by Kc4-d5-e6-d7, Nxc7, then Ne8-d6 and c7.

  #3  
Old August 5th 03, 12:14 AM
JMR
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Default Study of Kasparián refuted ?

Fine ! It works

Thanks


"Antonio Torrecillas" a écrit dans le message de
...
En/na JMR ha escrit:
Is this study correct ?

Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :

White :
King b3
Knight b7
Bishop g2
Pawns a2,c5

Black :
King c8
Knight d7
Bishop h4
Pawns a7,a6 and c7


1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6

I
do'nt see how to win neither Fritz !


Easy, .. Bf1-b5 followed by Kc4-d5-e6-d7, Nxc7, then Ne8-d6 and c7.



  #4  
Old August 5th 03, 12:26 AM
JMR
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Posts: n/a
Default Study of Kasparián refuted ?

But Fritz finds 8.Ff1 8....b5! 9.Rxb5 and now how to win ?

"JMR" a écrit dans le message de
...
Fine ! It works

Thanks


"Antonio Torrecillas" a écrit dans le message de
...
En/na JMR ha escrit:
Is this study correct ?

Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :

White :
King b3
Knight b7
Bishop g2
Pawns a2,c5

Black :
King c8
Knight d7
Bishop h4
Pawns a7,a6 and c7


1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6

axb6
I
do'nt see how to win neither Fritz !


Easy, .. Bf1-b5 followed by Kc4-d5-e6-d7, Nxc7, then Ne8-d6 and c7.





  #5  
Old August 5th 03, 01:06 AM
Antonio Torrecillas
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Posts: n/a
Default Study of Kasparián refuted ?

En/na JMR ha escrit:
But Fritz finds 8.Bf1 b5! 9.Bxb5 and now how to win ?
"Antonio Torrecillas" a écrit dans le message de
...

En/na JMR ha escrit:

Is this study correct ?
Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :
White : King b3, Knight b7, Bishop g2, Pawns a2,c5
Black : King c8, Knight d7, Bishop h4, Pawns a7,a6 and c7

1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6

I do'nt see how to win neither Fritz !


Easy, .. Bf1-b5 followed by Kc4-d5-e6-d7, Nxc7, then Ne8-d6 and c7.


after 9.Bxb5 it's blacks turn.

I suppose 9...Ka7 10.Kc4 Kb6 11.Nb8 ?? 12.Nd7 and now only to move our
king to d7 and eat the c7 pawn after some easy maneouvring.

AT

  #6  
Old August 5th 03, 05:23 AM
JMR
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Posts: n/a
Default Study of Kasparián refuted ?

So with your help and the help of Fritz I found this way to win :
1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6
8.Bf1 b5 9.Bxb5 Ka7 10.Be2 Kb6 11.Nb4 Kc5 12.Ba6 Bh4 13.Bb7 Bg3 14.Ka4 Kc4
15.Nc2 Kc5 16.Ka5 Kd5 17.Ka6 Bf2 18.Nb4+ Kc4 19.Nc2 Kd5 20.Na3 Bc5 21.Nb5
Bb6 22.Ba8 Kc5 23.Na7 Kd5 24.Kb7 Kc5 25.Nc8 Ba5 26.Ne7 Kd6 27.Nf5+ Ke6
28.Nd4+ Ke7 29.Kc8 Kd6 30.Nb5+ Kc5 31.Nxc7 +-
But how to be sure I play the best moves for black ?!



"Antonio Torrecillas" a écrit dans le message de
...
En/na Antonio Torrecillas ha escrit:
Is this study correct ?
Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :
White : King b3, Knight b7, Bishop g2, Pawns a2,c5
Black : King c8, Knight d7, Bishop h4, Pawns a7,a6 and c7

1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6
axb6 (8.Bf1 b5 9.Bb5)


In that position, you must think about pieces distribution, the bishop
defending the c6 pawn (sometimes from f3, sometimes from d7), the white
king atacking the c7 pawn and forcing black king not to be near c7
(sometimes in d7, in c8 or b7) and knight atacking c7 pawn or helping
maneouvring of remaining pieces.

Fritz hardly can help you because some lines are very long (maybe until
30th move starting with 1.c6) and you must think for yourself (well, you
can use Fritz as black player ... It's a nice exercice!)

AT



  #7  
Old August 5th 03, 07:34 AM
JMR
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Posts: n/a
Default Study of Kasparián refuted ?

For example I have already refuted the previous "win" by

1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6
8.Bf1 b5 9.Bxb5 Ka7 10.Be2 Kb6 11.Nb4 Kc5 12.Ba6 Bh4 13.Bb7 Bg3 14.Ka4 Kc4
15.Nc2 Kc5 16.Ka5 Kd5 17.Ka6 Bf2 18.Nb4+ Kc4 19.Nc2 Kb3 20.Na1+ Kb2 =

"JMR" a écrit dans le message de
...
So with your help and the help of Fritz I found this way to win :
1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6
8.Bf1 b5 9.Bxb5 Ka7 10.Be2 Kb6 11.Nb4 Kc5 12.Ba6 Bh4 13.Bb7 Bg3 14.Ka4 Kc4
15.Nc2 Kc5 16.Ka5 Kd5 17.Ka6 Bf2 18.Nb4+ Kc4 19.Nc2 Kd5 20.Na3 Bc5 21.Nb5
Bb6 22.Ba8 Kc5 23.Na7 Kd5 24.Kb7 Kc5 25.Nc8 Ba5 26.Ne7 Kd6 27.Nf5+ Ke6
28.Nd4+ Ke7 29.Kc8 Kd6 30.Nb5+ Kc5 31.Nxc7 +-
But how to be sure I play the best moves for black ?!



"Antonio Torrecillas" a écrit dans le message de
...
En/na Antonio Torrecillas ha escrit:
Is this study correct ?
Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :
White : King b3, Knight b7, Bishop g2, Pawns a2,c5
Black : King c8, Knight d7, Bishop h4, Pawns a7,a6 and c7

1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6
axb6 (8.Bf1 b5 9.Bb5)


In that position, you must think about pieces distribution, the bishop
defending the c6 pawn (sometimes from f3, sometimes from d7), the white
king atacking the c7 pawn and forcing black king not to be near c7
(sometimes in d7, in c8 or b7) and knight atacking c7 pawn or helping
maneouvring of remaining pieces.

Fritz hardly can help you because some lines are very long (maybe until
30th move starting with 1.c6) and you must think for yourself (well, you
can use Fritz as black player ... It's a nice exercice!)

AT





  #8  
Old August 5th 03, 11:00 AM
JMR
external usenet poster
 
Posts: n/a
Default Study of Kasparián refuted ?

Maybe this win is correct ? :

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "2 ième prix Schachmaty v SSSR"]
[Black "Kasparián"]
[Result "1-0"]
[Annotator "JMRW,JMR"]
[SetUp "1"]
[FEN "2k5/pNpn4/p7/2P5/7b/1K6/P5B1/8 w - - 0 1"]
[PlyCount "51"]
[SourceDate "2003.06.14"]

1. c6 Nb6 2. Bh3+ Kb8 3. Nc5 Bg3 4. Nxa6+ Ka8 5. a4 Bf4 6. a5 Bg3 7. axb6
axb6
8. Bf1 b5 9. Bxb5 Ka7 10. Be2 Kb6 11. Nb4 Kc5 12. Ba6 Bh4 13. Bb7 Bg3 14.
Ka4
Kc4 15. Na6 Kd5 16. Kb5 Be5 17. Bc8 Bd6 18. Nb8 Bc5 19. Ka6 Bb4 20. Kb7 Kd6
21.
Na6 Ba5 22. Bh3 Bb6 23. Bg4 Ba5 24. Bf3 Bb6 25. Nb4 Ba5 26. Nd5 $18 1-0



"JMR" a écrit dans le message de
...
For example I have already refuted the previous "win" by

1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6
8.Bf1 b5 9.Bxb5 Ka7 10.Be2 Kb6 11.Nb4 Kc5 12.Ba6 Bh4 13.Bb7 Bg3 14.Ka4 Kc4
15.Nc2 Kc5 16.Ka5 Kd5 17.Ka6 Bf2 18.Nb4+ Kc4 19.Nc2 Kb3 20.Na1+ Kb2 =

"JMR" a écrit dans le message de
...
So with your help and the help of Fritz I found this way to win :
1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6
8.Bf1 b5 9.Bxb5 Ka7 10.Be2 Kb6 11.Nb4 Kc5 12.Ba6 Bh4 13.Bb7 Bg3 14.Ka4

Kc4
15.Nc2 Kc5 16.Ka5 Kd5 17.Ka6 Bf2 18.Nb4+ Kc4 19.Nc2 Kd5 20.Na3 Bc5

21.Nb5
Bb6 22.Ba8 Kc5 23.Na7 Kd5 24.Kb7 Kc5 25.Nc8 Ba5 26.Ne7 Kd6 27.Nf5+ Ke6
28.Nd4+ Ke7 29.Kc8 Kd6 30.Nb5+ Kc5 31.Nxc7 +-
But how to be sure I play the best moves for black ?!



"Antonio Torrecillas" a écrit dans le message de
...
En/na Antonio Torrecillas ha escrit:
Is this study correct ?
Kasparián G.
2 ième prix Schachmaty v SSSR 1948
White wins

Position :
White : King b3, Knight b7, Bishop g2, Pawns a2,c5
Black : King c8, Knight d7, Bishop h4, Pawns a7,a6 and c7

1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3

7.axb6
axb6 (8.Bf1 b5 9.Bb5)

In that position, you must think about pieces distribution, the bishop
defending the c6 pawn (sometimes from f3, sometimes from d7), the

white
king atacking the c7 pawn and forcing black king not to be near c7
(sometimes in d7, in c8 or b7) and knight atacking c7 pawn or helping
maneouvring of remaining pieces.

Fritz hardly can help you because some lines are very long (maybe

until
30th move starting with 1.c6) and you must think for yourself (well,

you
can use Fritz as black player ... It's a nice exercice!)

AT







  #9  
Old August 5th 03, 05:01 PM
Claus-Jürgen Heigl
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Posts: n/a
Default Study of Kasparián refuted ?

Antonio Torrecillas wrote:

I suppose 9...Ka7 10.Kc4 Kb6 11.Nb8 ?? 12.Nd7 and now only to move our
king to d7 and eat the c7 pawn after some easy maneouvring.


I found it rather tricky, although it´s a forced win.

First, it´s faster for White if he captures the pawn with the king.
In the above continuation, Black can move 11...Ka5 and White needs
some time to free his bishop (12. Ba6).

After 8...b5 9. Kb4 Ka7 10. Kxb5 White needs to do two things:
Attack the pawn c7 with knight and king and separate the black king
from his pawn. It isn´t enough to place a white king on d7, because
then the black king can defend the pawn from b6 or b8, depending
from where the white knight attacks. It´s necessary for White to
either deny the black king a square from which to defend the
pawn or to force the black king in the way of his bishop.

So 10...Bf4 11. Kc5 Bd6+ 12. Kd5 Kb6 (or 13...Bg3 14. Nc5 Kb8
15. Ke6 Kc8 16. Ba6+ Kb8 (16...Kd8?? 17. Kf7 and 18. Ne6 mate)
17. Kd7) 13. Nb8 Bf4 14. Nd7+ Ka7 (Black wants access to b8 and b6)
15. Ke6 Bg5 16. Nf8 Bf4 17. Kd7 Bd6 18. Ne6 Kb8 (if 18...Kb6 then
19. Bg2 and 20. Kc8)

White now must find a way to push away the black king. The only way
to do this is Na6+.

Therefo 19. Bg2 (protects the c6 pawn because the white king
soon moves away, and forces Black to give up control of c5 - the
route for the knight) 19...Bh2 20. Nc5 (threatening Na6+ and Nxc7)
20...Ka7 (prohibits Na6) 21. Kc8 Bg3

Now that b8 is denied to the black king the white knight needs to
attack the pawn from d5 and it´s done? Almost. Unfortunately,
a white knight on d5 blocks the bishop from protecting the pawn
c6 so the bishop has to relocate to a square where it´s safe and can
protect c6 while the knight occupies d5. The square is - e8!

22. Bf3 (preparing for Bh5-e8) 22...Bh2 (22...Ka6 23. Kb8 (threat
Be2+) Kb5 24. Kb7 and the Black king can defend c7 no more. White
wins with Nb8-a6xc7.) 23. Bh5 Bg3 (for 23...Ka6 look above) 24. Be8
and there is no defense against Nf6-d5xc7 (of course 24...Bh4
25. Kxc7).

Claus-Juergen
  #10  
Old August 5th 03, 05:53 PM
JMR
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Posts: n/a
Default Study of Kasparián refuted ?

The idéa is good but there is one correction to do I think
JMR

2 ième prix Schachmaty v SSSR
Kasparián
Gain Blanc
1.c6 Nb6 2.Bh3+ Kb8 3.Nc5 Bg3 4.Nxa6+ Ka8 5.a4 Bf4 6.a5 Bg3 7.axb6 axb6
8.Bf1 b5 9.Kb4 Ka7 10.Kxb5 Bf4 11.Kc5 Bd6+ 12.Kd5 Kb6 13.Nb8 Bf4 14.Nd7+ Ka7
15.Ke6 Bg5 16.Nf8 Bf4 17.Kd7 Bd6 18.Ne6 Kb8 19.Bg2 Bh2 20.Nc5 Ka7 21.Kc8 Bg3
22.Bf3 Bh2 23.Nd7 [ 23.Bh5?? Kb6=] 23...Ka6 24.Kb8 Kb5 25.Kb7 Kc4 26.Nf6 Kd3
27.Nd5 Be5 28.Nxc7+-


"Claus-Jürgen Heigl" a écrit dans le message de
...
Antonio Torrecillas wrote:

I suppose 9...Ka7 10.Kc4 Kb6 11.Nb8 ?? 12.Nd7 and now only to move our
king to d7 and eat the c7 pawn after some easy maneouvring.


I found it rather tricky, although it´s a forced win.

First, it´s faster for White if he captures the pawn with the king.
In the above continuation, Black can move 11...Ka5 and White needs
some time to free his bishop (12. Ba6).

After 8...b5 9. Kb4 Ka7 10. Kxb5 White needs to do two things:
Attack the pawn c7 with knight and king and separate the black king
from his pawn. It isn´t enough to place a white king on d7, because
then the black king can defend the pawn from b6 or b8, depending
from where the white knight attacks. It´s necessary for White to
either deny the black king a square from which to defend the
pawn or to force the black king in the way of his bishop.

So 10...Bf4 11. Kc5 Bd6+ 12. Kd5 Kb6 (or 13...Bg3 14. Nc5 Kb8
15. Ke6 Kc8 16. Ba6+ Kb8 (16...Kd8?? 17. Kf7 and 18. Ne6 mate)
17. Kd7) 13. Nb8 Bf4 14. Nd7+ Ka7 (Black wants access to b8 and b6)
15. Ke6 Bg5 16. Nf8 Bf4 17. Kd7 Bd6 18. Ne6 Kb8 (if 18...Kb6 then
19. Bg2 and 20. Kc8)

White now must find a way to push away the black king. The only way
to do this is Na6+.

Therefo 19. Bg2 (protects the c6 pawn because the white king
soon moves away, and forces Black to give up control of c5 - the
route for the knight) 19...Bh2 20. Nc5 (threatening Na6+ and Nxc7)
20...Ka7 (prohibits Na6) 21. Kc8 Bg3

Now that b8 is denied to the black king the white knight needs to
attack the pawn from d5 and it´s done? Almost. Unfortunately,
a white knight on d5 blocks the bishop from protecting the pawn
c6 so the bishop has to relocate to a square where it´s safe and can
protect c6 while the knight occupies d5. The square is - e8!

22. Bf3 (preparing for Bh5-e8) 22...Bh2 (22...Ka6 23. Kb8 (threat
Be2+) Kb5 24. Kb7 and the Black king can defend c7 no more. White
wins with Nb8-a6xc7.) 23. Bh5 Bg3 (for 23...Ka6 look above) 24. Be8
and there is no defense against Nf6-d5xc7 (of course 24...Bh4
25. Kxc7).

Claus-Juergen



 




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