CLEARANCE - Notes of a Soviet Master American Chess Players while an active king can

while an active king can be your secret weapon in endgames and attacks

It is considered one of the top three best lines against 1

We have the answer from Edward Lasker's book

Navara – European Club Cup – Novy Bor

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CLEARANCE - Notes of a Soviet Master American Chess Players while an active king canPublisher: Caissa Editions Author: Alexander Ilyin Genevsky Year of Publication: 1986 Pages: 54 Notation Type: Algebraic (AN) Book Description Translated by Bernard Cafferty from the original Russian edition of 1929. A small book, but a fascinating account of this prominent revolutionary's early chess career and Soviet chess in the 1920s buttressed by fifty of his games from his entire career including his immortal sacrificial win over Capablanca