Nimzowitsch's 25...h6 — The Immortal Zugzwang Game, 1923

Copenhagen 1923: The Stage for a Strange Masterpiece

The game was played at a tournament in Copenhagen in the spring of 1923, an event Nimzowitsch won. The Latvian-born master had settled in Denmark after the upheavals of war and revolution, and he was entering the most productive period of his life, the years in which he forged the ideas that would become My System. His opponent, Friedrich Sämisch, was a formidable German grandmaster whose name survives in sharp variations of the King's Indian and the Nimzo-Indian. This was no exhibition against a weak amateur. It was a serious tournament game between two professionals, which is exactly what makes its finish so extraordinary in chess history.

The opening was a Queen's Indian Defence: 1.d4 Nf6 2.c4 e6 3.Nf3 b6, one of the hypermodern systems Nimzowitsch championed. Black ceded the centre temporarily, controlled it from a distance with the bishop on b7, and waited. Sämisch played the White side without conviction, exchanged on d5 at the wrong moment, and drifted. By move 15 Nimzowitsch had a comfortable game and a plan. Sämisch had neither.

The Slow Strangulation

What followed was a clinic in Nimzowitsch's own theories: restraint, provocation, then the decisive break. With 16...f5 Black seized space and opened the path for his kingside pieces. Sämisch's queen wandered to d1, his knight retreated to b1, its starting square, and his rook shuffled to g1 to defend against phantoms. Black's pieces, by contrast, took up dominating posts one by one: the bishop to b5 and then d6, the pawns rolling forward on the queenside.

Then came the stroke that defines the game. With 20...fxe4 and 21...Rxf2, Nimzowitsch gave up a knight for two pawns. Materially White was winning. Positionally he was already dead. The Black rook sat on f2, untouchable, soon joined by its partner on f5. The bishop landed on d3, cutting the board in half. White's queen huddled on e3, his rooks on e1 and g1 stared at their own pawns, his knight on b1 and bishop on d2 defended each other in a pitiful knot. This was not chess tactics in the usual sense. It was a python tightening, coil by coil, the purest expression of positional chess strategy ever recorded.

25...h6!! The Move That Threatens Nothing and Wins Everything

After 25.Rce1, Nimzowitsch played 25...h6. The move attacks nothing, defends nothing, and prepares nothing. It is a pure waiting move, and that is the whole point. It said to Sämisch: it is your turn, show me a move. And there was no move to show.

Consider White's options. The pawn advance 26.g4 fails to 26...R5f3, when White's position collapses around his king. 26.Kh2 also runs into ...R5f3, since 27.Bxf3 is met by a decisive invasion on the second rank. Any move by the rooks, the bishop or the knight abandons a critical defensive duty and allows ...Re2, when the rook, protected by the bishop on d3, attacks the queen on e3, and the queen has nowhere to go. The queen herself cannot move without dropping material immediately. That leaves only spare pawn moves on the queenside, and Black, with ...h5 and ...a5 and ...Kh7 in reserve, could outlast them all. Sämisch surveyed this desert and resigned. A grandmaster with every piece still on the board, compelled to move, and ruined by the compulsion.

Why Middlegame Zugzwang Is Almost Impossible

Zugzwang is a familiar weapon in chess endgames, where a king and a handful of pawns can easily run out of safe squares. With queens and rooks on the board it is nearly unheard of, because major pieces almost always have some neutral square to shuffle to. To put a full army into zugzwang, every single White piece had to be simultaneously tied to a defensive task it could not abandon. That is what Nimzowitsch engineered: the knight pinned to its post, the bishop chained to defence, both rooks immobilised, the queen trapped in a box of her own pawns, the king walled in.

Hans Kmoch, the Austrian master and writer, christened it the Immortal Zugzwang Game, a deliberate echo of Anderssen's Immortal Game of 1851. The comparison is apt because the two games are perfect opposites. Anderssen won by giving away nearly everything in a blaze of checks. Nimzowitsch won by taking away everything, square by square, until even the right to move became a death sentence. Both now stand together among the most famous chess games ever played.

The Aftermath and the Argument It Settled

For Nimzowitsch the game was a manifesto made flesh. He was at that time fighting a running polemical war with the classical school of Tarrasch, who dismissed the hypermoderns as eccentrics. Two years later My System appeared, and the Sämisch game became one of its star exhibits: proof that prophylaxis, blockade and restraint were not abstractions but weapons that could destroy a grandmaster without a single check being given. The game has appeared in virtually every major anthology since, and a century of engine analysis has only confirmed how hopeless White's final position was.

Nimzowitsch went on to his greatest triumphs in the late 1920s, including first place at Carlsbad 1929, and pressed his claim to a title match in the era of the World Chess Championships under Alekhine, though the match never came. Sämisch, to his credit, carried on as a respected grandmaster for decades, his name attached to opening systems still feared today. But he is remembered first as the man who ran out of moves.

The Legacy of the Quietest Brilliancy

Among the famous chess players of the romantic and classical eras, brilliance meant sacrifice and checkmate. Nimzowitsch widened the definition forever. After Copenhagen 1923, the chess world had to accept that a humble pawn move could be a double-exclamation-mark brilliancy, and that total domination was as beautiful as any mating attack. Every modern player who manoeuvres patiently, restricts counterplay and squeezes rather than storms is working in the tradition this game founded. Petrosian, Karpov and Carlsen are all, in this sense, Nimzowitsch's heirs.

The game is also a teaching cornerstone. Coaches use it to show students that the obligation to move is a real resource, that piece activity matters more than material, and that a position can be evaluated by asking a simple question: what does my opponent actually want to do? When the honest answer is nothing at all, the game is over, even if the scoresheet says otherwise. It is fitting that this lesson was delivered on the standard equipment of serious chess, the Staunton chess set, named for Howard Staunton and born in a London workshop in 1849.

Frequently Asked Questions

Q: What does zugzwang mean in chess?

Zugzwang is a German term meaning compulsion to move. In chess, a player is in zugzwang when the obligation to make a move is itself the problem: every legal move available makes the position worse, and the player would be perfectly safe if only passing were allowed. The rules of chess do not permit passing, so the player must self-destruct. Zugzwang is common in king and pawn endgames, where a single tempo often decides the result, but it is extraordinarily rare in the middlegame with most of the pieces still on the board. That is precisely why Sämisch versus Nimzowitsch, Copenhagen 1923, became famous: Nimzowitsch achieved a genuine middlegame zugzwang against a strong grandmaster, with queens and rooks still in play, by move 25.

Q: Why did Sämisch resign after the quiet pawn move 25...h6?

Because he had nothing left to do. The move 25...h6 made no threat at all. It simply handed the move back to White, and every White reply lost material by force. The key motif is the rook switch to e2: if a White piece abandons its post, Black plays ...Re2, attacking the trapped queen on e3 with the rook protected by the bishop on d3, and the queen has no escape square. The pawn thrust 26.g4 fails to 26...R5f3, when the position collapses around the White king. White had only a handful of spare pawn moves on the queenside, and Black could simply answer with his own waiting moves until they ran out. Rather than play out the humiliation, Sämisch resigned on the spot.

Q: What opening was played in the Immortal Zugzwang Game?

The game began as a Queen's Indian Defence: 1.d4 Nf6 2.c4 e6 3.Nf3 b6, with Black fianchettoing the queen's bishop to b7 to control the central light squares from a distance. Fittingly, the Queen's Indian was one of the hypermodern systems that Nimzowitsch himself championed, alongside the Nimzo-Indian Defence which still bears his name. His treatment of the opening in this game was a model of his theories: restrain the centre, blockade, provoke weaknesses, then strike. Sämisch handled the White side passively, lost time with his queen and knight, and allowed the freeing break 16...f5 followed by the piece sacrifice 20...fxe4. By move 25 White's extra piece was meaningless because not one of his pieces could move.

Q: Who was Aron Nimzowitsch?

Aron Nimzowitsch (1886 to 1935) was a Latvian-born Danish grandmaster and one of the most influential chess thinkers who ever lived. He was a leader of the hypermodern movement, which challenged the classical dogma that the centre must be occupied with pawns, arguing instead that it could be controlled from a distance and attacked once overextended. His books My System (1925) and Chess Praxis (1929) introduced concepts such as prophylaxis, blockade, overprotection and the restraint of pawn chains, and they remain standard reading a century later. At his peak around 1925 to 1931, including his triumph at Carlsbad 1929, he was among the two or three strongest players in the world, though he never secured a world championship match against Alekhine.