Chess Digest Magazine, Dallas, 1973, paperback, 65 pp, 130 grams, condition: very good.

Krogius -and Alburt- give three characteristics of an endgame:

1. Endgames favor an aggressive king.
2. Passed pawns increase greatly in importance.
3. Zugzwang is often a factor in endgames and rarely in other stages of the game.