The Silent 9...a5: The King's Indian Facing the Bayonet, and the Uneven Arithmetic of the Repertoire Market

It is half past three in the morning and the laptop screen wakes the room in Mymensingh. I am running a DVD course — an old format still surviving in a crowd of apps — and pausing at move nine. White has played 9.b4, the Bayonet Attack. Black, by the book, plays 9...Nh5: the position opens, the moves become forced, and you must keep pace with the engine. But the course suddenly leaves the engine-bound road and says 9...a5. From a Mymensingh bedroom I learned that the stadium is only a screen — and on this screen the real event is not the move but the market language hidden behind its name. The title promised something else. ChessMom returns: Supporting mothers on and off the board — mothers, support beyond the board, the promise of a community. Inside, it is a King's Indian Defence repertoire DVD whose central argument is a Black alternative against White's Bayonet Attack. That gap between title and content is not mere editorial sloppiness; it is the temperament of this market. The language of selling and the language of the board drift apart, and the reader is left standing in the middle, unable to reconcile the accounts. This piece should begin with a warning about its own footing. Every information point in the analysis I am working from carries no source attribution, and the material itself is a promotional announcement in which the author explicitly states he is recommending. In other words, this is a single-source, commercially motivated input. The rest of the arithmetic has to be read with that limitation firmly in mind. First, the board. The King's Indian Defence — 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 — is a hypermodern defence. Black concedes the centre and strikes back with ...e5. The sharpest branch of the Classical system is the Mar del Plata (7...Nc6): White leaps at the kingside, Black at the queenside, a race between two wings that demands patience and calculation at once. This branch is analysed so deeply that it has become a battle of memorisation. White's Bayonet Attack, 9.b4, is a move against exactly that battle of memory. By playing b4, White restrains Black's queenside expansion, squeezes the space for ...b5, and claims room for himself. Black's main reply is 9...Nh5: the position opens, tactics multiply, forced lines appear — and there, computer analysis becomes indispensable again. This is why the Bayonet Attack is a pressure point of modern preparation: whoever has the better engine and the better memory survives; whoever does not, loses time. The DVD's proposal, 9...a5, sits precisely here. It is not a new move — in the King's Indian Bayonet it is a known, established sideline that fights for ...a4 and ...b5 and avoids the forcing path of ...Nh5. The course claims that here there are very few concrete lines, the positions stay sound, and the emphasis shifts from tactics to plans. In other words, the selling point is a move away from memory and towards understanding. This is where I have to stop, because the DVD's language and the board's truth are two different things. The trade-off between a strategic sideline and a forcing main line genuinely exists. 9...Nh5 forces more, brings more tactics, but increases the burden of memory and calculation. 9...a5 demands less memorisation but insists on long-term understanding. For a club-level player that trade can be worthwhile — there is no denying it. But the course's biggest claim stands on weak ground. That computers often do not know how to handle these complex strategic positions is an outdated and overstated statement in the engine era. Modern engines handle the closed, strategic positions of the King's Indian perfectly well. This is not a technical claim; it is a marketing sentence. The weaker claim is the evaluation: objectively the chances are equal, but if Black knows the plans things can quickly become dangerous for White. There is a clever framing here — separating the objective evaluation from the practical one. Yet the report contains no engine evaluation, no ACPL, no sample games, no database statistics. The claim stands on language alone, not on evidence. One practical truth deserves mention too: 9...a5 is nothing new. It is a repackaging of established theory. In the repertoire market this is a familiar cycle — once a main line becomes over-analysed, practical sidelines return as solutions. For the seller this is clever; for the buyer it is a risk decision. From my years of watching games, let me say this: when people buy a course like this, they are really buying two things — a plan and a reassurance. The plan can work. The reassurance is often bought at a premium. The true value of a sideline never lies in its being superior, but in the pressure it puts on the opponent's clock and mind. That is psychology, not theory. This material has no direct relationship with the structure of a tournament — it is not event coverage, it is a preparation-layer object that sits well before any tournament. That layer of training and preparation is the real field of play here. Seen from the industry side, the piece paints a portrait of a mature opening-theory market, where publishers sell repackaged sidelines and players buy them seeking a practical edge. The effect is small and local; there is no event, no specific player, so the ripple through the system is minor. The Bangladesh context is not irrelevant here. Our club-level players, sitting at tables in Dhaka or Mymensingh, draw the bulk of their preparation from imported material — books, courses, screens. Where the local coaching infrastructure is thin, a single DVD becomes the whole repertoire. That is why the language of this market shapes us so strongly. Niaz Murshed became South Asia's first grandmaster in 2026, but that first-mover advantage never turned into a preparation infrastructure. So even now, a large part of our students' preparation depends on the sentences of a foreign seller. A second, more uncomfortable question follows. We assume a main line must be best and a sideline must be weak. It is time to look at it the other way — at least at club level. A main line is a main line because it is objectively strong. But for someone with limited preparation time, an objectively strong line is of no use at all if he cannot remember it. There, the practical sideline becomes the real objectivity — because games are won at the board, not on the analysis page. Even so, there is a blind spot here. First, once a sideline becomes popular, White builds a counter-solution and the window of advantage closes. Second, reliance on one sideline makes a player predictable. Third, and most important — if someone shapes his preparation on the reassurance that it is dangerous for White, the real risk lies not at the board but in expectation. That expectation gap is this DVD's greatest weakness. The mismatch between title and content deepens the suspicion. ChessMom, or mothers, against a King's Indian DVD — that mismatch says the product's identity or packaging cannot be fully trusted. Perhaps it is a re-release from an old catalogue, or perhaps a series brand name has been pressed onto it. Either way, the buyer should be cautious. There is another layer that is rarely noticed: the DVD format itself is in crisis. In an age of subscription courses and streaming platforms, a DVD is a legacy delivery channel. So the question is not only whether the move is good — the question is whether this material is new theory or a new wrapper around old theory. That answer is not in the course's language. So what should a player do? First, verify the sideline himself — run it through an engine and a current database. Second, treat 9...a5 as an addition to a repertoire, not a replacement for the main line. Third, never mistake marketing language for analytical language — the seller sells, and you stand at the board. Chess has always been played in empty stadiums; so it is here. There is no gallery, only a board and a screen. Batumi arrived through remote control, and the game became a signal I could pause — and that is exactly why I want to see the move behind the sentence. If, next season, 9...a5 appears against the Bayonet in an elite tournament, and the database shows Black's losing rate has not risen, then the sideline will be proven and White's preparation will come under pressure. But if the engine shows 9...a5 is clearly weaker, then the DVD's central claim collapses. I am not searching for the existence of a move; I want to see whether, even when the language changes, the board stays the same.