I am having trouble understanding when Black should move c5 in The Advanced Variation of the Caro-Kann. I have posted two games of mine below:
In this first game, after the seventh move of White, the computer has no quarrel with the pawn advance c5 (though I played Ne7). However, here:
Which is a really similar position, if I play c5 (on the 8th move),Stockfish tells me it is not the right thing to do, but rather I should have played Ne7 which is a move also acceptable in the former position.
My question is: does anyone know when is the advance c5 appropiate? I cannot see any reason why these positions should be differently evaluated at all.
I mean in the second position I find no particular reason why playing c5 which in case of being captured allows the direct development of my kingside bishop can be a bad thing at all.