Punish the Uncastled King Like a World Champion

Wilhelm Steinitz, the first official World Chess Champion, delivered a masterful performance in his famous game known as 'The Battle of Hastings,' where he punished an uncastled king. Can you identify the critical move in this game?

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The position comes from the game Steinitz vs. von Bardeleben. Which variation is winning for White?

Well done if you’ve discovered it! If not, you can check out the video where I break down all the ideas: