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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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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Ask what he is actually threatening
Before defending, ask whether the threat is real and what exactly it threatens. Often the answer is less than it looks.
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Be obsessed with undefended pieces
Make it a habit to notice every undefended piece, yours and his, and to count the defenders of every piece that is under attack.
Strategy
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A piece up, convert by improving
A piece ahead, finish developing rather than hunting for more material, and look for the trade that turns the advantage into a win.
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The king can be tucked away without castling
The king can sometimes be made safe by walking it a square or two, keeping the rook where castling would have taken it away.