p.51 In general, the mobility of the pawns [King and Pawn Endings] is more important than their number.
Two connected passed pawns are more valuable than "sextuplets" (six pawns on one file). This is why White can win in a blocked
position only if he can get his pawns moving, which is usually possible only if he has the opposition.
p.179 Any piece is good or bad according to its mobility.
p.203 We have repeatedly emphasized that mobility is the decisive factor in all phases of chess.
p.235 All chess theory is based on the concept of mobility: one piece is stronger than
another if it can cover more squares; one position is preferable to another if the pieces act together more harmoniously and
do not get in one another's way. This consideration is the key to questions of positional advantage in general,
but is especially applicable to the case of bishop vs. knight. A knight in the center covers eight squares; a Bishop thirteen.
It is only because the knight can cover squares that the Bishop cannot reach that the discrepancy is not more marked.
p.392 The criterion by which we can judge whether one rook is better than another is its degree
of mobility: its freedom of action and the number of squares it can control.
p.411 Exposed Pawns: ...The main disadvantage to these weak pawns is not so much that material
is lost sooner or later - sometimes this happens only after long and complicated maneuvering - but that defending
them limits the mobility of the defending pieces.
p.421 Doubled Pawns: In pawn endings, doubled pawns that are qualitatively inferior - i.e.,
held in check by a smaller number - are a serious handicap, but even when they do not produce a passed pawn their
lack of mobility is often fatal.
