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The chess game played between Vassily Ivanchuk and Artur Yusupov in Brussels in 1991 is often celebrated for a remarkable and deeply strategic concept known as “Ivanchuk’s Immortal.” The game is considered one of the most instructive and memorable games in chess history due to the rich tactical and strategic content.

The game is especially noteworthy for Ivanchuk’s creative and audacious play, as he brilliantly exploits the concept of “outpost squares.” Here are some key aspects that make this game special:

1. **The Immortal Concept:** In this game, Ivanchuk, playing White, sacrifices a knight on move 23 by playing 23. Nxe6, leading to a highly complex position with a series of sacrifices. These sacrifices are aimed at controlling key squares and restricting Black’s pieces.

2. **Outpost Squares:** The game revolves around the concept of outpost squares, particularly the d5 square. Ivanchuk manages to establish a powerful knight outpost on d5, which cannot be easily challenged by Yusupov. This outpost square becomes the focal point of White’s position and a major source of Black’s difficulties.

3. **Strategic Mastery:** Ivanchuk’s game displays deep understanding of strategic chess concepts, including piece coordination, pawn structure, and the importance of strong central outposts. His creative use of these elements is a testament to his exceptional chess talent.

4. **Tactical Fireworks:** The game features a remarkable combination of tactics and sacrifices, leading to a breathtaking series of moves that ultimately give Ivanchuk a winning advantage.

The game, often referred to as “Ivanchuk’s Immortal,” is a prime example of how creativity, strategy, and tactical vision can come together in a brilliant and memorable chess masterpiece. It’s a game that has been analyzed, celebrated, and studied by chess enthusiasts and players alike, and it continues to be a source of inspiration for those looking to improve their understanding of chess strategy and tactics.