Question about c4/d4 & c5/d5

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Viznik

Can someone help explain what is the main idea of playing c4/d4 as white? I’m coming across this position often now as I study the KID & the Réti, as well as just generally seeming to be a strong move against openings like the Sicilian or the Bird.

Also, for black, what is the main idea with d5/c5? Is it the same idea as for white?

Im just trying to understand what the goal playing these two pawn moves are, as I’m actually finding I really like the positions I get out of them but am wondering what I should be looking for while playing them.

Examples:


ALSO, as it pertains to building fundamentals, I often find myself wondering why it’s bad to take a “free” pawn such as this below;

Does this damage the structure too dramatically to make up for the free pawn grab? Is the center really that important?

snow

the idea is somebody who premoved the queens gambit. In all seriousness I think it's so you take space and /or trade the opponents center pawns later on

ninjaswat

In the last diagram, the Benoni is NOT a gambit, you never lose the pawn for good... for example I had an 1800 fall into this once:

 

ninjaswat
little_guinea_pig wrote:

to 1. I think that the point of it is to get a solid center, without it being as vulnerable to attack as the e-pawn. As for 2. the reason is that White can't hold onto his pawn and Black will take it back with the better structure.

 

Hehe yes you got it. People love to take en passant in the czech for some reason.