9...a5 and the Unverified Promise Amid the Bayonet Attack Craze

On the chessboard, there are moves only insiders can hear. 9...a5 is one of them.

After White plays 9.b4 — the Bayonet Attack, a queenside space-grabbing pawn push in the King's Indian Defense, Mar del Plata variation — Black's standard reply is 9...Nh5. That move is sharp, opens the position, and forces both sides into a chain of variations that computers have dissected to the millisecond. But a recently released chess DVD proposes another path: 9...a5. A pawn nudges up one square, barely making a sound on the evaluation bar. No applause. Nobody screenshots the board to share on social media.

I read that promotional line on a morning in Da Nang, and the first thing that came to mind was not the move, but my second notebook — the one where I record things not yet verified. In this profession, I have learned that a promise, however elegant, can never replace a single line of data.

The Bayonet Attack is no new trend. The move 9.b4 has been around for decades within the Mar del Plata system, and remains one of White's favorite attacking approaches against the KID. Black defends, concedes the center from the first moves, and seeks counterplay. Mar del Plata is the sharpest variation of that system: Black puts the knight on c6, pushes the e-pawn to e5, and both sides launch into a race of attacks on the queenside and the kingside.

In that position, 9...Nh5 is the orthodox choice. The knight leaps to the board's edge, clears the path for the f-pawn, and turns the game into a chain of forcing moves. White must respond precisely. Black must remember a barrage of variations. Theory thickens year by year, and when neural-network engines arrived, the gap between professional players and amateurs in this variation widened further — not because anyone was smarter, but because someone was willing to study longer.

The DVD in question takes the opposite path. 9...a5 does not open the position. It closes it. The a-pawn advances one square, attacks White's b4-pawn, and gradually turns the game into a slow strategic battle rather than a calculation race.

The notable thing is how the DVD positions its product. It does not promise a theoretical revolution. It promises a change in the game's character: from concrete, easily memorized, easily refuted lines to a balanced position with few clear variations, requiring the player to think for themselves.

The key point: 9...a5 is a known branch, not a new invention. It is an alternative to 9...Nh5, not a replacement. The marketing claims both sides have equal chances — a positional claim, not a claim of theoretical superiority. The product's real value lies in practical steerability, not the objective strength of the move.

There is a small paradox I noticed when rereading the introduction. The DVD builds its argument on a human-versus-computer contrast. According to it, 9...Nh5 opens the position, forces the lines, and makes computer analysis important again; whereas 9...a5 leads to sound positions with very few concrete lines. It suggests computers often do not know how to handle such complex strategic positions.

But that is pre-AlphaZero language. When engines like Stockfish 8 or Komodo relied on tree search, that argument held some truth. But once computers learned to evaluate positions through neural networks — and grew better still at handling long-term strategic KID positions — the phrase "computers don't understand" became a marketing claim more than a technical fact. In the chess-instruction market, sellers need a reason for buyers to believe this product is for humans, not for the machine that has already beaten every player.

But there is a larger problem to state plainly.

Reading the information package attached to the DVD carefully, I encountered a serious inconsistency. The original article's headline discusses a team round in Samarkand — "R2 (open): Despite close calls, all top teams grab wins". Meanwhile, all the detailed content discusses a chess DVD, the move 9...a5, the Bayonet Attack. Two unrelated texts stitched into one package.

For anyone doing verification work, this is the biggest red flag. A source whose headline drifts from its body cannot be cited as a credible source, however compelling the content inside may be.

I still remember 2026, when I was an intern in Da Nang, misreading the visiting team's number 9 striker's name three times in a row during an U21 international match at Hoa Xuan Stadium. Viewers in a central Vietnam group teased me for "talking like reading a newspaper". I spent a full month reviewing tapes to memorize nearly 200 players' names. But what I learned was not how to remember names. Mistakes in front of the microphone taught me that perfection is only a draft of sincerity. And in this case, sincerity begins by stating that this information package is flawed. Not a minor flaw. A structural one.

Technically, the DVD makes a verifiable argument. It does not claim 9...a5 is objectively stronger than 9...Nh5. It claims 9...a5 is more practical for a certain group of players. That is an acceptable claim, and it places the product in exactly the right niche: club players without time to memorize, those tired of being dragged into theoretical races where an opponent only needs to open a database to gain an edge.

But there are three gaps any serious buyer should notice.

First, the DVD offers no numbers at all. No ACPL, no win rate, no sample games cited. A product claiming practicality should prove itself with practical data.

Second, there is no author name, no record of the author's results in the Mar del Plata, no games cited. In chess theory, the presenter's credibility matters as much as the content presented.

Third, and the point I weighed most, 9...a5 is a known branch. That does not mean it is bad. But it means well-prepared White players already know how to handle it. An antidote is only valuable until the opponent finds their own antidote. In chess theory, that spiral never stops.

Following top-level games in recent years, I have noticed the KID's share of classical games has dropped significantly from its golden era. Leading modern players favor systems with lower theoretical risk — the Grünfeld, the Nimzo-Indian, or new Italian variations. The Mar del Plata survives as a surprise weapon, not a regular choice. And a chess DVD cannot change that structure.

The most striking thing, perhaps, is not the move. It is how the DVD chooses its buyer.

The marketing targets "players who like to think for themselves". That is an identity-based invitation, not a technical one. It does not say "this move is stronger". It says "you belong to this group". This is classic marketing strategy: selling the buyer an image of themselves, then letting the move tag along as a reward.

In the chess-theory industry, this is nothing new. Nor is it wrong. But it reminds me that a chess-instruction product competes directly with free databases and free engines. What it sells is not the lines — because those lines will, sooner or later, appear somewhere publicly. What it sells is guidance, structure, story.

So what is worth keeping from this story?

Perhaps a question about theoretical memory. When a branch like 9...a5 returns in a promotional DVD, it does not come back because it has been proven. It comes back because it has been mentioned. In chess, mention has its own power. A move forgotten for ten years can become a threat simply because your opponent has never seen it.

Sports culture is a graveyard of names, so their stories might live one more inning. That is true for players. It is also true for moves.

I do not know whether 9...a5 will make waves in top-level events. I only know that if it does, its traces will lie in long classical games, where 2700+ players test it against the most thoroughly prepared opponents. That is the only test of value. Every other advertisement is a draft.

The microphone does not make the storyteller. It is the silence of the stands that signs each line of the script. And on the chessboard, it is the silence of empty squares where the move truly speaks.

Sport does not promise victory; it only promises a heartbeat willing to continue. With 9...a5, what I take away is not whether to play the move or not. What I take away is this: before trusting any antidote, check whether the seller has left their name behind.