As said, square control, a very important eval feature, is almost inexistent, even in current top engines.

Here how you can utilise for the good the concept of an empty square.

**Give bonus, some 5-8cps normal values, to each empty square into the own half of the board.**

That will mean, that you will give the bonus for squares unoccupied by either own pawns and pieces, or enemy pawns and pieces, for ranks 1-4.

What does this rule achieve?

You will not believe it, this is a magical rule. Actually, I do not know of a truer chess rule.

The bigger number of empty squares into the own half of the board, ranks 1-4, means basically 2 things:

- that you have more pawns and pieces into the enemy half of the board, and

- that the opponent possibly has penetrated less of his own pawns and pieces into your half of the board

And the 2 above facts simply denote that you enjoy

**space advantage**.

Of course, this might be somewhat redundant with outposts, or advanced pawns, for example, but, believe me, space advantage is so important, that doing it in many different ways could never bring you harm, even if the terms are somewhat redundant.

I know that some engines do space advantage in terms of minors attacking certain squares on the board. How more meaningful is this rule than simply counting empty squares?

Of course, counting empty squares is much more meaningful.

For the time being I leave it like that.

Any comments very much appreciated.