The 9...a5 Claim: A DVD Against the Bayonet in the Mar del Plata, and the Arithmetic the Advertisement Never Shows

Two sentences sit next to each other in the same paragraph of the product description, and they cancel each other out. The first says computers do not handle closed, strategic Mar del Plata positions well. The second says that after 9...Nh5, 'computer analysis becomes important again.' Both can be true. Placed together, they reveal something the advertisement would rather not: the entire value of the line being sold rests on the premise that engines understand nothing here — and in the same breath the author concedes that engines are the standard being escaped.

I notice contradictions like this when I read an event run-of-show and find no contingency sheet attached. Opening-product literature is the same artefact: a script that never states what happens when the audience asks a question the script did not anticipate. This article is about that missing page — the one where engine evaluations, game counts, result percentages and model-game names would be written.

Context: what the branch is, and where the product sits in it

The King's Indian Defence begins plainly — 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6. Black concedes central space, strikes with ...e5 and rolls the kingside pawns. The Mar del Plata is its sharpest branch: ...Nc6 and ...Ne7 followed by ...f5, with both sides hunting opposite-wing kings. The name comes from the Argentine city where the line drew attention at the 2026 tournament; the ECO classification files it in the E97–E99 band.

White's fashionable answer is the Bayonet Attack, 9.b4, taking queenside space to blunt Black's kingside build-up. Black has two principal replies: 9...Nh5, the acknowledged main line that leads into forced calculation around ...f5 and ...Nf4; and 9...a5, a less-played, more strategic alternative.

The product under discussion — a DVD in the 'Svitlana's Smart Moves' series — advocates the second. Its argument is textbook-clean, and I will set it out in full before weighing each link.

The syllogism: the Mar del Plata produces mutual attacks and long-term strategic positions; computers are weak in such positions; therefore players who think for themselves should choose it; but the Bayonet disrupts that comfort; and the main line 9...Nh5 collapses into forced, computer-friendly sequences; therefore play 9...a5 and stay in the human domain.

The logic is internally coherent, and it reflects a real trade-off in King's Indian practice — computer-checkable forcing lines versus strategically opaque manoeuvring. The problem is not the argument. It is the evidence.

Core: four links, and a gap at every one

The first link — 'computers cannot handle these positions' — is the weakest today. Before 2026 the sentence was broadly true: engines were stronger at calculation than at positional assessment in closed structures, and their evaluations in Mar del Plata positions were unstable. The arrival of NNUE evaluation in 2026 narrowed that gap dramatically. What was an insight in 2026 is a marketing convenience in 2026. No technical lie is being told, but an old clock is being sold at a moment when its time has moved.

The second link — '9...Nh5 is forced and engine-friendly' — is correct on its own and works in the product's favour. It also undermines the first. If the problem is that 9...Nh5 requires engine analysis, then the complaint is not engine incapacity but engine availability. And no line escapes availability: 9...a5 is in the databases too, and the engine sees it just as fast. What makes 9...a5 practical is not engine blindness but the opponent's preparation cost.

The third link — 'strategy, not memory' — is the most honest description of the target audience, and in my reading the product's only genuine strength. A large cohort of players would rather understand a position than memorise twenty-five moves, and few products are built for them. That is a real segmentation, even without a number attached.

The fourth link — 'objectively equal, but dangerous for White' — is a familiar pairing in opening literature. It soothes two buyer fears at once: the line is not refuted (so the money is not wasted), and the line carries chances (so wins will come). Both can hold. Here, however, there is no engine evaluation, no results split by rating band, no named model game. There is not a single number in the entire description — no game count, no database frequency, no ACPL, no match rate.

The absence is not accidental. Opening-product advertising runs on conviction, not statistics. For the buyer the implication is plain: read the technical claims as hypotheses, not theorems, and verify them in your own database.

Scope: one node of a tree, and the illusion of a solution

The most practical thing the description never says is what the product does not answer. In the Mar del Plata, White keeps fully independent alternatives on move nine — 9.Ne1 and 9.Nd2 — plus earlier deviations such as 8.Be3 and 8.Re1. A Black player adopting the Mar del Plata needs answers to all of them.

That is not a flaw in the product; it is the nature of the tree it occupies. The flaw lies in the impression a buyer can form: 'an antidote to the Bayonet' and 'a Mar del Plata repertoire' are two different things, and advertising language flattens them into one. I see the distinction the way I see an evacuation plan for two stadium sectors presented as an evacuation plan for the stadium. The paperwork looks complete. It only does half the job.

The Olympiad: good raw material, real selection bias

Putting 'Olympiad' in the title is branding, but not dishonest branding. The Olympiad arrives every two years, fields more than 180 national teams and a large share of the world's top players, and publishes every game. As a source of model games it is almost free, high-quality raw material.

Team events bring a selection bias no opening author can ignore. In a team match a draw is frequently sufficient. When a board only needs a draw, intensity drops and risk management rises. I learned that inside a stadium across seven fixtures — the contingency sheet is the real host — and in chess the translation is this: a model game must be checked for whether it was played under team pressure or the cleaner pressure of an individual round-robin. Same opening, two mental states, two different qualities.

The product description names no game, round, player or edition. The Olympiad here is not an analytical instrument. It is a title ornament.

The human level the description left out

The series is branded 'Svitlana', and the description goes no further — no full name, no title, no rating, no indication of whether the presenter has ever played 9...a5 in a serious classical game. For a repertoire product that is a real credibility gap.

I look at it this way. Across years of watching classical team-event broadcasts, a pattern holds: younger titled presenters often trail veteran coaches on theoretical depth and lead them on explanation. They can say why a move is played, where a database can only say how often. A DVD's value lives in that 'why'. The problem is that a buyer cannot tell which grade of 'why' is on offer until after payment.

The terminological slip that damages discovery

The title says 'King's Indian Attack'. On the moves given, that is wrong. The King's Indian Attack is a distinct system — 1.Nf3, 2.g3, 3.Bg2, d3 — in which White borrows the King's Indian structure. The subject here is the King's Indian Defence: 1.d4 Nf6 2.c4 g6 ... 6.Be2 e5 7.0-0 Nc6.

In a search-driven market the title is the taxonomy. The player who plays the King's Indian Defence and is troubled by 9.b4 may never find this product; the player who plays the King's Indian Attack may buy it and feel misled. One word, two customer pools, damage in both directions.

Contrarian: the real strength is not being engine-proof, it is preparation asymmetry

I think the strongest case for this product is not the one it makes. The advertisement says: computers are weak here, therefore the line is human. My reading is different: the line is useful because your opponent has not prepared it. Against 9...Nh5, every 2026+ player carries thirty moves in a database. Against 9...a5 he has two or three general formulas and then has to think at the board. That gap is produced not by engine incapacity but by opponent incapacity — and the gap is real, measurable, and as old as chess.

The product's greatest risk hides in the same argument. Once the method for 9...a5 is published, that asymmetry starts to erode. A published antidote stops being an antidote. The buyer on day one gains; the buyer in year two inherits a line whose counter-preparation has already been written. That is the natural lifespan of any static opening product, and the remedy is version management, not louder rhetoric.

The expectation gap: a promise of less calculation, a reality of more judgement

The description says there are few concrete lines and the emphasis falls on strategy. It also says, in the same breath, that these positions demand long-term planning and tactical sharpness. Both statements are true, and together they produce an uncomfortable truth for the buyer: where there are no forced moves, the demand on judgement rises, not falls. Fewer concrete lines does not mean less work; it means the responsibility for the error is entirely yours. At club level the effect inverts the pitch — weaker players lose less in forced lines and more in open strategic ones.

That is the least-priced risk here: a promise of ease, a delivery of difficulty. Such gaps breed resentment, and in a small community resentment travels fast.

Forward

I am not dismissing the product. 9...a5 is a real, playable alternative; consolidating and explaining it has genuine value; and the 'players who think rather than memorise' segmentation is honest. What is missing is the paperwork — the page with six entries on it: engine evaluation, game count, results split, model-game list, presenter credentials, version date. Produce those six and the advertisement becomes a review.

My mind changes when the product page lists model games, at least two of them from individual classical events where a 2700-plus player met 9...a5 and held or won; and when a current NNUE engine's assessment of the critical positions stays stable as depth increases. Until then this is a hypothesis I will test in my own database, not a press release I will trust.

The run-of-show is a script until the stadium rewrites it. The same holds for opening products — and here the stadium is called an engine.