Here’s a game I played with the black pieces (online) which show the importance of activity of one’s pieces, or, the consequences when there is a major lack of piece activity. In short, I sacrificed material to severely limit the activity of my opponent’s knight, bishop and rook. In the end, it all payed off, as almost all of his pieces were immobilized.
After Bb3 the idea of trapping the bishop came to mind. But first finishing development.
Here we go. Sacrificing a pawn to immobilize the white squared bishop.
But now white’s entire Queen side becomes passive. Look at the knight on b1, it literally can’t go anywhere. The dark-squared bishop on c1 and the rook on a1 are not active either. Ideally, I want a black knight on a4, a black pawn on e4, and a black knight on d3, and those white pieces will be burried alive.
Nc5 immediately may have been better as a4 is white’s freeing move.
And that’s black rook for a white knight. However, that knight (and white’s Queen) are its only active pieces.
See my comment at move 13. Mission accomplished. I’m down in material (2 points), but white simply can’t use his Queen-side forces (11 points).
White resigned. None of his pieces (except for the king) can move.