L'espansione è un principio strategico che prevede un cambio di pedoni per penetrare nel territorio nemico con il re o un altro pezzo, ottenendo così un qualche vantaggio (generalmente applies to attack pedestrians weak opponents). The most famous practical application of this concept is the position after 34.f5 of Geller - Hort 1968, virtually ubiquitous in the final strategy books!
Geller's idea is to change the pedestrians "and" and "f" to be able to penetrate with their parts in the wing of the black king. 34 ... AG3 35.fxe6 fxe6 36.Dg6 Axe5 38.Re4 + Rf8 37.Dxe6 AH2 AH2 41.Ae3 DF7 40.Ad2 AG3 39.Rf5 + 1-0 Hort having left the position almost lost. The black fact is intended to prevent any entry of the enemy king in g6, while white has more freedom, being able to bring their own king in the wing of a woman. To example 42.Dxf7 Rxf7 43.Ad2! Stronger immediate 43.Re4. Note that after 44.Ac3 the black king is bound to defend the g7 pawn. 43 ... Ad6 44.Ac3 AG3 Black is now in total Zugzwang. 45.Re4 g6 46.Rd5 and White won. 
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