1. d4 Nf6 2. Bg5 is an administrative decision as much as a chess move. Black has prepared the Nimzo-Indian, the Grünfeld, the King’s Indian, the Queen’s Indian — several hundred pages between them — and none of it will appear on the board. The bishop pins nothing, threatens to take on f6, and asks a question that has to be answered from general principles.
The Trompowsky sits in ECO A45. It belongs to a small family of second-move deviations whose value is measured less by theoretical evaluation than by how much preparation they render irrelevant.
Origins
Octávio Trompowsky was a Brazilian champion in the 1930s and 1940s who played the move consistently enough for it to acquire his name. It had appeared before — the idea of an early Bg5 against an Indian setup is old — but Trompowsky treated it as a system rather than a one-off, and the attribution is fair.
Its passage into mainstream practice came much later, and largely through Julian Hodgson, the English grandmaster who used it as a primary weapon through the 1980s and 1990s and won a great many games with it against strong opposition. Hodgson’s practice established the modern view: the Trompowsky is not an attempt to refute Black’s setup but a way of reaching an original middlegame with a small advantage in familiarity.
The opening’s Brazilian origins are worth noting for a structural reason too. It emerged outside the main European theoretical tradition, at a time when opening preparation travelled slowly, and its early practitioners were not constrained by the assumption that 2. c4 was the only serious move.
What the bishop buys
The immediate threat is Bxf6, and the whole opening rests on evaluating that exchange. If White takes on f6 and Black recaptures with the g-pawn, Black’s kingside pawn structure is damaged and Black has the bishop pair. If Black recaptures with the queen, the structure is intact but the queen is exposed and White gains time with Nc3 and e4.
Neither outcome is bad for Black objectively. What matters is that both are unbalanced, and that they arise on move three. There is no long theoretical corridor to walk down and no memorised sequence to rely on. Positions with doubled pawns and bishops against knights require judgement from the first moment.
White’s typical plan after the exchange is to occupy the centre with e4 and d4, using the extra central control that Black’s damaged structure permits, and to play against the doubled pawns in a long manoeuvring game. When Black avoids the exchange, White often follows with e3, Bd3 and Nd2, building a modest but sound structure and keeping the bishop pair in reserve.
Main replies
2…Ne4 is the most common and most testing answer. Black attacks the bishop immediately and gains time, and White must decide where to put it. The retreat to f4 is the Raptor Variation, keeping the bishop active and eyeing the c7 and b8 squares; the retreat to h4 keeps the diagonal but invites …c5 or …d5 with tempo. Both are respectable, and the choice between them is largely a matter of what kind of middlegame you want.
2…e6 is the solid answer, preparing …h6 and …Be7 and transposing toward more familiar structures. 2…d5 claims the centre directly, and White’s usual reply is to take on f6 and follow with e3 and c4, playing against the doubled pawns.
2…c5 is the sharpest, leading after 3. Bxf6 gxf6 4. d5 Qb6 to the Poisoned Pawn lines, where Black grabs on b2 and both sides play a genuinely double-edged game. This is the branch that most rewards preparation and most punishes its absence.
The practical case
The Trompowsky’s honest evaluation is that it does not promise White an advantage against accurate play. Nearly every mainstream reply equalises with correct handling. That statement, however, describes a smaller part of chess than it appears to.
What the opening offers is a systematic reduction of the opponent’s preparation to nothing, at a cost of roughly zero. White’s positions are structurally sound, the plans repeat from game to game, and the theoretical burden is perhaps a tenth of what a main-line 1. d4 repertoire requires. For players whose study time is limited — which is nearly all players — that trade is heavily favourable.
It has a further use at the top level as an occasional weapon. Because it is not a main line, an opponent’s engine-assisted preparation is unlikely to extend deeply into it, and the resulting positions demand exactly the kind of independent judgement that preparation is meant to replace.
How to study it
Learn the recapture question first. For each of Black’s main replies, work out whether taking on f6 is good, and what Black’s best recapture is. This single decision recurs in every line of the opening and determines the character of the game.
Then pick one answer to 2…Ne4 and stay with it. The Raptor and the h4 retreat lead to different middlegames, and the value of the Trompowsky comes from repetition — playing the same structures often enough to know them better than the opponent possibly can.
Finally, prepare the Poisoned Pawn line concretely. It is the one branch where general understanding is not enough, and where an unprepared White player can be worse by move ten.