do not remove your Queen too far from the immediate point of action. A
skilful player will often permit you to win a Pawn with the Queen, that
he may prevent her returning in time to rescue your King from his
attack. The power of the Queen is wonderfully greater when she is aided
and protected by other Pieces than when she goes forth unsupported; it
is generally injudicious, therefore, to make an attack with her unless
in combination with some other of your forces.

_Concerning the Rook._--The Rook is a most important officer, yet few
players even amongst the best avail themselves sufficiently of his
power. He has seldom much scope for action in the early part of the
engagement, but when the field is thinned no time should be lost in
bringing him into action. You should then endeavor to _double_ your
Rooks, that is, to place them one before the other on the same file: in
this situation, mutually sustaining one another, their potency on a
clear field is equal to the Queen's.

It is usually good play to get command of an open file, that is to say,
a file which is occupied by no other man, by stationing a Rook at one
end of it. When you have thus gained possession of the file, should your
opponent try to dispossess you of it, by playing one of his Rooks on the
same file, it is frequently better to defend with your other Rook than
to take his or remove your own. You will often embarrass your adversary,
too, if you can manage to post a Rook on his second rank, say at your
King's 7th or Queen's 7th square. In this position he generally makes an
attack on the Pawns unmoved, and compels the enemy to lose time in
defending them, while you can bring more forces into action.

One of the strongest reasons for playing out your Pieces early in the
battle, is, that while at home they are not only themselves inactive,