King's Indian, Mar del Plata: The 9...a5 Move and the Promise of Escaping Memorization

There is a sentence that has become a familiar motif of the opening-theory market: “This line frees you from memorization.” The last time I ran into it was in an instructional product on the King's Indian, where the move 9...a5 is presented as an antidote to the Bayonet Attack 9.b4. I set the board up again, placed the pieces, and sat still long enough for the squares to become familiar. The board did not change. Only the way people read it did.

People say girls know nothing about tactics. So I write for them to read. And the first thing I want them to see sits right at the front of the document.

The source's title refers to a team-event round report in Samarkand — “R2 (open)” — noting that despite close calls, all the top teams won. But the entire body discusses an opening DVD built around 9...a5. Two different texts have been stitched together, with no point of connection. For a quiet observer, that is the first signal to lower the reliability rating. A source that contradicts itself cannot serve as the foundation for any conclusion, no matter how attractive the technical content inside may be. I note this detail before moving on, because ignoring it would leave every later analysis standing on sand.

Why Mar del Plata is still alive

The King's Indian is the classic hypermodern system: Black concedes the center early and then counterattacks it. The Mar del Plata variation, with ...Nc6 and ...e5, is the sharpest branch of the classical system, sitting roughly in the ECO E97–E99 range. There, both sides enter a race with no room for hesitation: White pushes the queenside, Black counterattacks the kingside, and every move carries a commitment that cannot be taken back.

The Bayonet Attack, 9.b4, is White's fashionable answer. White gains queenside space, pushes Black's pieces into passivity, and pressures the opponent's pawn structure. Black's orthodox counter has long been 9...Nh5 — opening the position, forcing concrete lines, and pulling computer analysis back into the spotlight. That is the path of the student, of the player who believes victory lies in remembering correctly more than the opponent does.

Seen through the eye of geometry, 9...Nh5 draws a sharp point thrust into the center — the knight leaping to the rim, forcing White to react at once. The 9...a5 alternative opens a distant horizontal on the queenside, where the a-pawn advances to challenge White's b4-pawn. Two moves, two different shapes on the same board. One forces a reply; the other invites a choice. That difference looks small, but it shapes the entire character of the game that follows.

The product I am discussing proposes the second path. According to its pitch, 9...a5 leads to sound positions with very few concrete lines, suited to players who like to think for themselves rather than memorize. This is a psychological stance packaged as a technical one. It is appealing, and precisely because it is appealing it deserves scrutiny.

Three numbers that do not exist

If you ask where the evidence is, the honest answer is: there is none. The material offers not a single sample game, no win rate, no draw rate, no ACPL figure, no engine evaluation. It also names no player to cross-check against. The only thing provided is a claim: the two sides are balanced, the chances equal.

That is a statement about the position, not a new discovery. The core point is this: 9...a5 is a known secondary branch, not an invention. It is real in practice, but it does not replace 9...Nh5 as the main line. Its value is practical — shifting the character of the game from direct confrontation to positional, low-memorization chess.

For club players, that can be a liberation. For professional players, it is a very different question. The biggest problem lies in the sales argument itself. The material says computers often do not know how to handle these complex positions, so humans have a window. That was once true in the pre-AlphaZero era. But today's neural-network engines assess the long-term strategic positions of the King's Indian far better than that sentence implies. “Computers don't understand” is now an outdated slogan, a relic of an earlier era, no longer a technical truth.

This matters because it is the axis of the whole argument. If the value of 9...a5 comes from computers failing to grasp the position, then that value is fading with every new engine version. Tactics never lie; only readers get them wrong.

The counterintuitive point: an antidote can be counter-dosed

This is the part that kept me sitting longer than anything else. The idea of a clean antidote is appealing, but chess does not work that way. Any published branch becomes a target. The moment 9...a5 is packaged as a product and sold, it steps into the sights of prepared White players. A known secondary branch, once thoroughly analyzed, can be neutralized or refuted by the opposing side. That is the ordinary rhythm of opening theory, not a far-fetched hypothesis.

In other words, what this product really sells is not theoretical superiority but practical steerability — a way off the forced path. That value is real, only much smaller than the advertising language suggests. The promise that if Black knows what to do, things quickly become dangerous for White is the classic absolutism of advertising, something any clear-headed buyer should discount.

There is a deeper layer. The product most likely compiles already-published theory rather than doing original research. No author name, no title, no record in this very variation. A serious buyer would want to see sample variations with engine evaluations before spending money. Here, both are absent. When a product hides who made it, that is a signal for readers to protect themselves.

I have a rule when I write: a compliment must come with a straight remark. So let me say both sides. The strategic approach, aimed at players who dislike forced lines, is a real and durable niche. Club players, those studying up to IM level, can find a way of playing that matches their character — thinking for themselves, taking responsibility, not depending on memory. But that value is not for the elite. A well-prepared Bayonet player can still find play.

The opening-theory market is one of the steadiest and least glamorous revenue streams in chess. It sells answers to popular lines. In that arena, a product need not be absolutely correct; it only needs to be appealing enough for players to spend time on. Precisely for that reason, buyers must equip themselves with a filter. Three questions should be ready: who is the author, what is their record in this variation, and do the sample variations come with engine evaluations. Without all three, the buyer is paying for a belief, not for data.

In Vietnam, the chess community is growing, and the demand to study openings properly grows with it. That gives products like this a place to stand. But it also imposes a requirement: learners need to be equipped with the skill of reading a theory product, rather than simply being handed a belief.

Why this story is worth tracking

The notable question is not how strong 9...a5 is, but whether it shows up in elite classical games. If the move enters the practice of 2700+ players over a sustained period, the marketing promise will be confirmed or refuted. At the same time, the frequency of the Bayonet 9.b4 will determine the product's window of relevance. If it stays fashionable, the story continues. If not, it becomes a footnote to theory.

For buyers, this is a small decision, low in financial risk but potentially costly in precious study time. The mistake is not buying a DVD; it is believing there is a way to escape calculation. In the King's Indian, especially in the Mar del Plata, there is no such way. There are different positions, and each demands a different kind of understanding. The only thing that changes is which kind you choose to learn.

The pitch is wider when there is no noise. I see it more clearly than ever — and this time, I see it on the board. Sometimes, to understand a position, you must stand in silence longer than others can bear. I will keep watching King's Indian games with the sound off, setting up each piece again, and letting the board speak for itself. And next time someone sells an antidote, I will open the board before I open my wallet.