Zürich, 1953. At the Candidates Tournament where the King's Indian Defence was reborn, Svetozar Gligoric faced Alexander Kotov's Sämisch setup and gave up pawns to blockade White's centre. The sacrifice opened the long diagonal for his g7 bishop and shut down White's bishop on d3. Within a few moves, White's pieces had been driven back to their starting squares. The game ended in a draw, but the idea has stayed relevant ever since. For IM Filip Pancevski, it was the game that first taught him about the blockade. Decades later, he won a tournament game of his own with exactly the same idea. That connection between a classic idea and modern practice is what Understanding the King's Indian is built on.