Themes
Each number is a game; it opens the move where he explains the idea. Open a theme to read what it is about.
General
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030708111820
The method of comparison, in both directions
A move is right or wrong for a reason. Compare it with a position where it was the other way round, and the reason shows.
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06101218212223
Ask what the move just allowed
After every move, name what the position now allows that it did not a moment ago.
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01030506101112141518192223
Make one move do two jobs
When a task can be done in a way that also does something else, do it that way. Do not tie a piece to one job if another can do it and keep working.
Piece play
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1819
Not every pin is effective
A pin the opponent can undo with a useful move is no pin at all. Judge a pin by what it holds and for how long.
Strategy
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1819
Convert an extra piece by attacking, not only by trading
A piece ahead, you can win by trading down or by using the extra piece in an attack on the king; attacking is often quicker.
Attack
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0102182324
Is the attack real? Count who is home
Before attacking, or opening the centre, count whose pieces are actually out. The side with pieces still at home is the one punished.