0 in the game of chess, the side of the board where your queen is at the start of the game --
1 on the side of the board where someone's queen starts in the game of chess: --
Black's direct counterstrike in the centre is postponed so that the queenside advance can proceed quickly.
In this example, if only the queenside pieces were considered, it would be an instance of reciprocal zugzwang the player to move would lose.
Or, he can consider 9... a6 to grab space on the queenside with... b5.
This setup involves the fianchetto of the queenside bishop and 2... e6.
Most often the checkmated king has castled queenside, and is mated on c8 or c1.
Black will try to prevent this knight manoeuver by expanding on the queenside, taking action in the centre, or putting pressure on e4.
Black surrenders his outpost on d5, gaining a tempo for queenside space expansion by b7b5.
The opening is largely based upon tactics on the queenside or the f6- and g7-squares.
