Bayonet Attack: The 9...a5 Antidote and What a Chess DVD Doesn't Tell You

I reopened the game on my database at nearly half past eleven at night. A blue-black screen, imitation wooden pieces, the line of moves running down like wordless music. On move nine, White pushes the pawn to b4. The Bayonet Attack — a thrust into Black's queenside in the King's Indian Defence, Mar del Plata Variation. I have replayed hundreds of such games over the years, and every time I reach this move, I pause for a few extra seconds. Not because the move is hard, but because after it an entire theoretical map unfolds. Black can reply with Nh5, with a5, or with a handful of other choices. Each choice is a different story about how a human calculates before sitting down at the board. I rewind the SEA Games 29 footage to find what people forgot, and this time, what I need to find lies inside a theoretical product now selling what it calls an "antidote" to the Bayonet boom.

For readers to follow the thread, a brief word on the position is needed. The King's Indian Defence is a hypermodern opening: Black deliberately cedes the centre to White in the first few moves, builds a fortress of pawn g6, bishop g7, knight f6, then counterattacks that very centre with e5 or c5. The Mar del Plata Variation is the sharpest branch of the system: Black posts the knight on c6 and pushes e5, and both sides race to storm opposite wings. This is the ground Garry Kasparov tilled in his peak years, and it is largely thanks to him that this variation retains a place in grandmaster arsenals.

Inside the Mar del Plata, White has many approaches, but the Bayonet Attack — the move 9.b4 — is regarded as the most fashionable choice of the computer era. Instead of deploying slowly, White pushes the b-pawn at once, grabbing queenside space and forcing Black to answer a concrete question before completing development. The name says it all: a bayonet is a direct thrust, not a quiet developing move. After 9.b4, Black's main reply is 9...Nh5, sending the knight to the rim, eyeing the g3-pawn and clearing the way for the f5 counterattack. That is the forcing path, demanding that both sides memorise a long sequence, and machines analyse it beautifully because everything can be calculated out.

And this is where the product I mentioned enters. It proposes another direction: 9...a5. Instead of pushing the knight to the edge, Black pushes the queenside pawn to challenge the very b4-pawn, steering the game toward a closed, slow contest where, the advertisement claims, there are "very few concrete lines." The core promise is to change the character of the game: from a memorisation-driven battle to a strategic wrestling match where the player can think for himself. The value the product sells is not theoretical superiority but a psychological shift for the Black player — from coping by memory to coping by judgement.

I sat down to re-examine that claim exactly the way I once handled the World Cup 2026 data, when I wrote that Saudi Arabia's win over Argentina was no miracle. Looking at the essence of the position after 9...a5, several points stand out. First, 9...a5 is no invention. It is a long-known sideline, merely less popular than 9...Nh5. The product itself does not claim a novelty; it presents a known antidote. That matters, because it means well-prepared White players may already know it and have an answer.

Second, the game after 9...a5 in no way loses calculation. Black pushes a5 to force White to decide the fate of the b4-pawn: push to b5, and the queenside locks and Black gains a c5 target; retreat or trade, and the position returns to familiar structures with a closed centre. In both cases, countless branches remain to be calculated. What the product calls "very few concrete lines" is really a promise of a strategic battleground, where the number of forcing moves is smaller but the demand for positional understanding is higher. For club-level players this can be a genuine plus. For professionals, it remains a fully calculating fight.

Third — and this is what I checked most carefully — the product makes a claim about computers. According to the advertisement, 9...Nh5 "opens the position, forces the lines and makes computer analysis important again," whereas 9...a5 leads to "sound positions" where "computers often do not know how to handle" things. This sentence sounds very familiar to someone in my trade. It is the language of the pre-AlphaZero generation — an era when search-based engines grew awkward in long-term strategic positions where no immediate tactical blow can be scored. Since neural-network engines emerged and reshaped how machines evaluate positions, that argument has aged considerably. Modern engines handle closed King's Indian positions far better than the sentence implies. That does not mean humans have no edge in such positions — quite the opposite — but the reasoning offered is outdated.

I trust footage over testimony, because footage cannot lie. With a theory product, "footage" is data: engine evaluations, win-draw rates, sample games, the author's identity. And here I must say it plainly: not a single number is given. No centipawn evaluation, no sample game, no author's name with a record in the Mar del Plata itself. A product teaching an opening that cannot offer even one practical game from the line it promotes leaves the buyer no option but to trust the promise.

Meanwhile, the contemporary theoretical landscape tells a different story. The King's Indian in general, and the Mar del Plata in particular, no longer hold their former share. At elite events, players rarely take Black in this system unless they have a specific plan — choosing a surprise weapon, pushing the opponent out of familiar preparation. The Bayonet Attack was born precisely to counter that approach: White grabs space and forces Black to prove the centre concession was worth it. So the 9...a5 proposal, seen through market logic, is a sensible choice: it does not try to prove the King's Indian superior, it tries to offer an escape from the forcing theory of the 9...Nh5 branch.

But stopping there would miss a larger signal inside the very document I am analysing. The accompanying headline refers to a team round called "Samarkand R2 (open)," where "all top teams grabbed wins despite close calls." The entire body, however, discusses an opening DVD, never mentioning Samarkand, never naming a team, a round, a board or a result. Two different texts were stitched under one roof. For a documentary screenwriter, this is like footage that does not match the narration — it does not ruin the film at once, but it warns that the raw data has wandered.

This is the kind of error I encounter often enough to know how to handle: when a source contains an internal contradiction, every accompanying technical claim must be re-checked. I still analyse the opening content as an independent document, because it has a beginning and an end and genuine technical value. But I mark the headline as unverified data, possibly metadata spliced in wrongly during aggregation. Readers who want to cite it must know this before using the document as a source.

Back to the tactical story. What actually happens when Black chooses 9...a5 instead of 9...Nh5? I tell it with the ear first, the eye second — a habit I learned during the pandemic, when I turned the sound of the Hà Nam women's footballers' studs on a wooden floor into a battle drum. For a chess game, that sound is tempo. After 9...Nh5, tempo surges: White may storm the queenside, Black must counter on the kingside, and both sides essentially have to recall every move. After 9...a5, tempo slackens. The game opens a pause — a pause in which a player might glance at the next board, take a sip of water, and ask what the next move should be. That very pause is what the product sells, not an advantage.

There is a subtle point in 9...a5 worth dissecting further. Black's a5 push is not merely about reducing White's queenside space. The move changes the pawn structure, and in chess, whoever understands the pawn structure owns the middlegame plan. If White pushes b5, the queenside locks, and Black gains a clear target to attack with c5 and the c6-knight. If White holds or trades, the structure returns close to classical King's Indian positions where Black has familiar plans. In other words, 9...a5 does not dodge the fight; it picks a different fight, with different rules, where Black can orient himself more easily.

That explains why the product targets a specific readership: "players who like to think for themselves, not memorisers." This is identity-based positioning, not evidence-based positioning. It does not say "9...a5 is stronger than 9...Nh5"; it says "9...a5 is for people like you." In the opening-product market, where every move can be looked up for free, the real competitive edge lies in storytelling and curation. The seller is not selling data — data is available. The seller is selling a path.

But is that path durable? Here I must apply contrarian thinking, the rule I set myself after the Saudi Arabia–Argentina game: always ask what the data is saying in reverse. With 9...a5, what is the reverse data? It is that any branch packaged as an "antidote" sits in the crosshairs of the other side. The Bayonet Attack has been studied so thoroughly that prepared players will know 9...a5 and have a reply. Once the branch regains attention, it will be dissected, and the so-called "few lines" will gradually thicken with new theory. That spiral is the nature of modern opening theory, and no DVD reverses it.

Then comes the question of the expectation the product plants in the buyer's mind. The advertisement states that if Black knows what to do, "things quickly become dangerous for White." This is the kind of unfalsifiable claim, because it depends entirely on the opponent's level of preparation. I have reviewed many club games to test such statements, and the common denominator is clear: when White prepares well, the threats to both sides fall; when White is careless, the threats rise. The product's promise ignores the other half of the equation, and that omission is a form of inflation.

There is a further layer that I, with more than thirty years of observing the industry, notice. Products of this kind are usually built on theory already published for free elsewhere. The added value lies in curation and sequencing, not in entirely new research. In other words, buyers pay for tidiness, not for an invention. For newer players, that tidiness has real value, saving dozens of hours of fumbling through databases. For those who already own analysis tools, it may be redundant spending. The same product carries two different values — depending on where the buyer stands.

I have run hurdles my whole life, just never once officially timed. I use that line for myself whenever someone asks why I check the smallest details all the way down. With an opening product, the smallest details are the most important ones: the author's name, the sample games, the engine evaluations, and the origin of the claim. In the document I am analysing, all of these are missing. No person, no game, no machine — only a promise and a misplaced headline.

At this point I want to say something that may irritate a few colleagues. The existence of an opening product is not a bad thing. The business of chess theory is a durable segment of the industry, because there are always people who need a shorter path to understanding a position. What deserves scrutiny is how it positions itself: selling an antidote as though it closes the debate, when in truth it merely opens another door. For amateur players, the difference is small. For players building a solid theoretical foundation, trusting an "antidote" can lead them to neglect genuinely dangerous branches. That is expectation risk, and I always want it spelled out before a purchase.

So if I were deciding whether to study 9...a5, what would I do? I would not ask "is it stronger than 9...Nh5." I would ask "does it fit my style." If I enjoy closed positions, orienting the middlegame through understanding rather than memory of move sequences, then 9...a5 is worth my time. If I need fast play, needing sharp thrusts from move ten onward, then 9...Nh5 remains the main road. Theory does not judge; it merely opens doors. The one who walks through is the one who decides.

I sat before the screen until almost dawn. I reset the game to move nine, White pushes b4, and I watch Black think. In that pause there are two roads, two temperaments, two ways of telling the same story about the same position. The DVD highlights only one. A strong player is one who remembers that the other road always exists, and who does not sell himself to any publisher's promise.

Chess, at its deepest layer, is not decided by attractively packaged products. It is decided by the moment a player sits alone, looks at the board, and chooses the next move himself. Every DVD, every course, every "antidote" is only useful to the degree that it makes that moment clearer. When a theory document fails to do that — when it sells reassurance instead of understanding — the most lucid reader is always the one who asks: what is this data saying in reverse about itself?