From the Book - First edition.
Prevent your opponent from castling
Avoid moving castled pawns
Don't give pointless checks
Avoid unnecessary pawn moves
Don't rely on shaky defense
Don't block bishops with pawns
A knight on the rim is dim
Keep your fianchettoed bishop
Keep the right minor piece
Put rooks on the seventh rank
Understand relative values
Don't trade pieces when behind
Don't be afraid to trade queens
Don't sacrifice foolishly
Accept unsound sacrifices
Don't be afraid to move the king
Accumulate small advantages
Don't ignore enemy invaders
Turn problems into solutions
Combine defense with counterattack
Don't overextend yourself
Make your opponent overextend
Don't automatically make a queen
Passed pawns must be pushed
Rooks belong behind passed pawns
Decoy with the outside passed pawn
Play for protected passed pawns
The king is a strong piece