Understanding pawn pushing of opposite side castling.

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ABC_of_EVERYTHING

I have difficulty understanding the eternal motive of pawn pushing towards the enemy king on the event of opposite side castling. It is certainly not running, it must be something else. I just can't get it. So, on that part, I am making a lot of moves I don't understand or am confused and computer evaluation after the game agrees with me.  It is getting such a headache on me. Please, help!

Moreover, since this is a positional or strategical concept, I can't even understand "must be played" pawn move according to computer evaluation, since the end result is not a material gain.

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This is my latest game from the archive. Here is the game position.

In this position as black, I played Rd8 which give 0.50 advantage to white but the best move was a4 which give 0.80 advantage to black. I know it is pawn pushing but what we actually gain by it? Maybe space, my guess.

ABC_of_EVERYTHING

In this position as black, I played Rd8 which give 0.50 advantage to white but the best move was a4 which give 0.80 advantage to black. I know it is pawn pushing but what we actually gain by it? Maybe space, my guess.

ABC_of_EVERYTHING

No, you got all completely wrong. It was my move. I was playing black in this position.

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TheTurdBurglars wrote:

I don't see any rook on d8.

It was my next move from the given position.

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TheTurdBurglars wrote:

You can't play Rd8 if you are white. 

In post 8, I said that I was playing as black.

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The whole game

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To post 14,  Yes.

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Thanks, that was a good explanation. 

When I was playing the game I was too lazy to work out all those features. Otherwise, I certainly would have seen that.