Copenhagen, March 1923. Few of the games played that month are remembered today—and fewer still have a name that reads like a boast. The Immortal Zugzwang Game does, and for once the boast mostly holds up.
The players were a study in contrasts. Friedrich Sämisch was a solid, methodical German master. Aron Nimzowitsch was something rarer: a theorist who believed chess was a war of ideas, not of brute-force combinations. A few years earlier he had published one of the most influential books chess had ever seen, arguing that pieces should creep and squeeze the opponent rather than charge. In Copenhagen, he played like a man proving his own theories in public.
Sämisch opened quietly into a Queen's Indian. Nimzowitsch developed with unnerving calm. On move twelve he posted a knight to c4—a square Sämisch should have controlled. Sämisch lunged to trade it off, and Nimzowitsch called the piece "the ghost." It had done its work without ever taking anything: Sämisch had spent two tempi just to get rid of pressure that was mostly in his head.
Then came the slow squeeze. Nimzowitsch advanced ...f5, pushed ...b4, doubled his rooks on the f-file, and planted a bishop on d3. Sämisch spent a piece to clear the chaos on the queen's wing. It did not help. Around move twenty, White had no good plan and nowhere pleasant to put his king.
And then Nimzowitsch played the move nobody expected.
25...h6.
A little pawn push off to the side of the board. No capture, no threat you can see across the room. It was a waiting move—and a trap. Suddenly, Sämisch had no useful move left. Whatever he did, his position would get worse: slide a rook, and something valuable falls; shuffle the king, and the pressure just grows. Against any move he could make, Nimzowitsch had an answer. Sämisch resigned rather than drift toward certain loss.
That is zugzwang—the German word for being forced to move when every move you can make hurts you. In endgames it happens often enough; in the middlegame, with all the pieces still on the board, it is a rarity. Reuben Fine, writing in 1952, called 25...h6 "the most remarkable winning move on record." Harry Golombek called the game "the finest possible example of Zugzwang."
Not everyone agrees. Grandmaster Andrew Soltis and Wolfgang Heidenfeld both argued that the position wasn't a true zugzwang—that White had moves, just no good ones, and that the real point was a looming mate threat, not an absence of legal moves. Even the name is contested: Nimzowitsch claimed Danish chess circles invented it, and once compared the game to Anderssen's Immortal Game.
But that is part of what makes the story stick. Here is a win built on almost nothing showy—no queen sacrifice, no flashy combination, just a patient refusal to give the opponent anything to grab onto, ending with a quiet pawn that said: your move, and whatever you choose, it's the wrong one.