The Kádas, Clemenz and King's Head Openings: What 1.h4, 1.h3 and 2.f3 Are Actually For

Every one of these three openings starts with a move that looks like a beginner's mistake. A rook pawn pushed one or two squares on move one, or a king's-side pawn pushed to f3 after both sides have already played their main central pawn. None of them is a serious weapon against good play, and none of them is taught anywhere. People search for the names anyway, usually right after an opponent or an engine shows them the move, so it's worth knowing what each one actually does.

The Kádas Opening is 1.h4. It gains no space in the centre and develops nothing. What it does is prepare g4 and Rh3, a plan of swinging the rook along the third rank to attack on the kingside before Black has castled there — the idea is credited to the Hungarian player Gyula Kádas. Against a player who reacts normally, with a central pawn and quick development, White is simply down a tempo and worse. It scores in blitz because almost nobody has faced it and the Rh3 swing can catch an unprepared king, but it has no theoretical backing and strong players treat it as a joke opening.

The Clemenz Opening is 1.h3, one square rather than two, and it is quieter still: it doesn't even threaten the g4 advance the way the Kádas does. It is named after the 19th-century Baltic-German player Paul Felix Clemenz and is usually classified as a harmless transpositional try: it can turn into almost any other opening once White's second move commits to something real, such as d4 or c4, while taking away Black's ...Bg4 pin against a future Nf3 in some lines. On its own it gives away a tempo for very little, and most games that start 1.h3 settle into an ordinary opening a move later.

The King's Head Opening is different in kind: it starts with two normal, central moves, 1.e4 e5, and only goes wrong on move two with 2.f3. Unlike 1.h4 or 1.h3, this one directly weakens the king's own diagonal and the e1-h4 line, and it does so without any compensation — no space, no development, no attack prepared. It is sometimes played as a try to avoid known theory, and it occasionally transposes into lines of the King's Gambit or Bird-type setups if White follows up with f4, but taken straight it is simply a weak version of normal king's-pawn chess. Objectively it is the worst of the three, because weakening f3 in front of your own king on move two has no upside the way a slow rook pawn on the first move at least might.

What should you do when you face one of these as Black? The answer is the same in all three cases: play normal, principled chess. Take the centre with ...d5 or ...e5, develop your knights and bishops toward the centre, and castle. None of these openings punishes correct development — they only punish greed or carelessness, the same way the Rousseau Gambit above only works against a capture made without checking what it allows. Against 1.h4 specifically, be a little wary of committing your king to the side White has started to expand on if g4 and Rh3 are still coming; against 1.h3 and 2.f3, there is really nothing extra to watch for beyond normal development.

Should you ever play one of these as White? Only as a surprise weapon in fast time controls against opponents you expect to be unprepared, and even then, expect to be worse out of the opening if the surprise doesn't land. They are not stepping stones to anything — a serious opening repertoire doesn't pass through 1.h4 or 2.f3 on the way to anywhere good. If you like flank play that actually holds up, the English Opening or the Reti give you similar slow, flexible ideas without giving away a tempo for nothing.