Virtual Opposition - For the Love of god please explain

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sg4rb0
So the rule for opposition for this scenario is that "you will gain the virtual opposition if you move the king to a square that builds a rectangle (or a square) in which each corner is the same color."

 

 

So white to move here, he can play Kc2 and he apparently has the opposition.  Ok, so now imagine the white king on c2, black's turn to now move.  Black can play Kf7, and now he has the opposition?  So this rule is stupid.  Nobody appears to have an opposition that they could possibly maintain.  So how can it possibly ever help knowing this failed rule?

Thee_Ghostess_Lola

This is called distant opposition and there is a formula.

See below. Notice the White king always holds an odd # of squares between the black king after white has moved ?

Thee_Ghostess_Lola

 

Thee_Ghostess_Lola

And btw, u needta place a pawn somewhere on the board in Post #1 to figure out distant opposition....& then whose to move. Makes all the difference in the world.

IOW's, u may be oversimplifying hon.

peepchuy
sg4rb0 wrote:
So the rule for opposition for this scenario is that "you will gain the virtual opposition if you move the king to a square that builds a rectangle (or a square) in which each corner is the same color."

 
 

 

So white to move here, he can play Kc2 and he apparently has the opposition.  Ok, so now imagine the white king on c2, black's turn to now move.  Black can play Kf7, and now he has the opposition?  So this rule is stupid.  Nobody appears to have an opposition that they could possibly maintain.  So how can it possibly ever help knowing this failed rule?

 

After 1. Kc2 Kf7, Black does not have the opposition. The rectangle f7-c7-c2-f2 does not have the four corners of the same colour.

With 2. Kd3, White keeps the opposition, since the rectangle d3-d7-f7-f3 does have the four corners of the same colour.

 

Thee_Ghostess_Lola

....but with your opponent to move, correct ?

kindaspongey

After 1 Kc2 Kf7 2 Kd3, it is Black's move.

kindaspongey
Thee_Ghostess_Lola wrote:

And btw, u needta place a pawn somewhere on the board in Post #1 to figure out distant opposition....& then whose to move. Makes all the difference in the world. ...

It may seem a little silly and pointless, but I think it is sometimes considered helpful as an explanation tool to consider distant opposition for a position with just two kings. I think the usual practice is to think of distant opposition as unchanged by pawns. The pawns can change whether or not the distant opposition is useful. At

https://www.chess.com/forum/view/for-beginners/endgame-fundamental-question ,

one can see a position where White can achieve distant opposition with 1 Ke1, but the move actually gives Black the possibility to achieve a draw (starting with 1...Ke8).

maik1988

There is a very nice little game/puzzle in Silman's endgame book. White has his king on c1 and black has his on c8. The objective of the game with the white king is to get to any of the squares f8/g8/h8. If you can manage with white, white wins. If you defend with black, black holds/wins. I've played that game with both colours against friends and won with both colours. You need to count the squares between your king and the other king and time your advances properly. Try it on a board for half an hour and see if you can work it out.

kindaspongey
"... 'you will gain the virtual opposition if you move the king to a square that builds a rectangle (or a square) in which each corner is the same color.' ..." - sg4rb0
pfren wrote:

To get the distant opposition, the number of ranks AND files between the two kings must be odd (which is far more exact than the same-colored square non-rule) with the opponent to move. ...

Is there something specific and wrong with the quote that sg4rb0 presented?

kindaspongey
pfren wrote:
kindaspongey έγραψε:
"... 'you will gain the virtual opposition if you move the king to a square that builds a rectangle (or a square) in which each corner is the same color.' ..." - sg4rb0
pfren wrote:

To get the distant opposition, the number of ranks AND files between the two kings must be odd (which is far more exact than the same-colored square non-rule) with the opponent to move. ...

Is there something specific and wrong with the quote that sg4rb0 presented?

Sure there is. If the number of ranks and files between the two kings is even, the one that can gain the opposition is the side to move.

Could one perhaps alternatively say that, if the rectangular corner squares are not all the same color, then the one that can gain the opposition is the side to move?

Thee_Ghostess_Lola
kindaspongey wrote:
Thee_Ghostess_Lola wrote:

And btw, u needta place a pawn somewhere on the board in Post #1 to figure out distant opposition....& then whose to move. Makes all the difference in the world. ...

It may seem a little silly and pointless, but I think it is sometimes considered helpful as an explanation tool to consider distant opposition for a position with just two kings. I think the usual practice is to think of distant opposition as unchanged by pawns. The pawns can change whether or not the distant opposition is useful. At

https://www.chess.com/forum/view/for-beginners/endgame-fundamental-question ,

one can see a position where White can achieve distant opposition with 1 Ke1, but the move actually gives Black the possibility to achieve a draw (starting with 1...Ke8).

Ur right Spongy. My input wuz probably kinda dumb. Bare-naked kings is a good thing....if u wanna try2u/s virtual distant opposition.

Thee_Ghostess_Lola
pfren wrote:

To get the distant opposition, the number of ranks AND files between the two kings must be odd (which is far more exact than the same-colored square non-rule) with the opponent to move.

Notice that after 1.Kc2 (black to move- 5 ranks and 3 files separating the kings) Kf7 (white to move) the number of ranks and files between the kings is even (4 and 2, respectively).

PERFECT !....thx !! happy.png .

And btw everyone. When my pfren talks about conventional opening theory ?....listen very carefully (as u weed thru his condescending humor).

Thee_Ghostess_Lola
maik1988 wrote:

There is a very nice little game/puzzle in Silman's endgame book. White has his king on c1 and black has his on c8. The objective of the game with the white king is to get to any of the squares f8/g8/h8. If you can manage with white, white wins. If you defend with black, black holds/wins. I've played that game with both colours against friends and won with both colours. You need to count the squares between your king and the other king and time your advances properly. Try it on a board for half an hour and see if you can work it out.

Can u show this with a board diagram & decision offshoots ?....thx in advance happy.png .

mariners234
sg4rb0 wrote:

imagine the white king on c2, black's turn to now move.  Black can play Kf7, and now he has the opposition? 

Incorrect.

sg4rb0
mariners234 wrote:
sg4rb0 wrote:

imagine the white king on c2, black's turn to now move.  Black can play Kf7, and now he has the opposition? 

Incorrect.

 

What, why is that wrong?  Black makes all 4 corners of the square white, which makes him have the opposition.   You can't just write incorrect and leave it like that.  In my opinion your incorrect.

mariners234
sg4rb0 wrote:

What, why is that wrong?  Black makes all 4 corners of the square white, 

c7 and f2 are black.

This was also explained on post #5

unfollowing BTW

sg4rb0

That's correct, they are.  However c7 and f2 are nothing to do with this entire post lol.  You must be reading this completely wrong.

kindaspongey
peepchuy wrote:
sg4rb0 wrote:
So the rule for opposition for this scenario is that "you will gain the virtual opposition if you move the king to a square that builds a rectangle (or a square) in which each corner is the same color." ...
So white to move here, he can play Kc2 and he apparently has the opposition.  Ok, so now imagine the white king on c2, black's turn to now move.  Black can play Kf7, and now he has the opposition?  So this rule is stupid.  Nobody appears to have an opposition that they could possibly maintain.  So how can it possibly ever help knowing this failed rule?

After 1. Kc2 Kf7, Black does not have the opposition. The rectangle f7-c7-c2-f2 does not have the four corners of the same colour. ...

"... c7 and f2 are black. ..." - mariners234

"... However c7 and f2 are nothing to do with this entire post lol. …" - sg4rb0

The rule is based on the idea that Black's move, 1...Kf7, so-to-speak, "builds a rectangle" determined by the position of the white king and the new position of the black king. That rectangle has the corners as indicated by peepchuy, "f7-c7-f2-c2". The rule is that one gains the opposition if one makes a move that "builds a rectangle" with all of the corners having the same color. 1...Kf7 does not gain the opposition because f7, c7, f2, and c2 are not all the same color.

 

kindaspongey
Thee_Ghostess_Lola wrote:
maik1988 wrote:

There is a very nice little game/puzzle in Silman's endgame book. White has his king on c1 and black has his on c8. The objective of the game with the white king is to get to any of the squares f8/g8/h8. If you can manage with white, white wins. If you defend with black, black holds/wins. I've played that game with both colours against friends and won with both colours. You need to count the squares between your king and the other king and time your advances properly. Try it on a board for half an hour and see if you can work it out.

Can u show this with a board diagram & decision offshoots ?....thx in advance  .

I do not feel up to the task of indicating "decision offshoots", but I think that perhaps one line is sufficient to indicate the idea.