9...a5: When an Old Chess Branch Promises What No One Verifies

1 a.m. Only the board remains on screen, with move notation blinking. I am reviewing a high-level King's Indian Defense game, and on move nine, Black does not play 9...Nh5 as most games in my database do. Instead, the queen-side pawn quietly advances one square — 9...a5.

No applause. No exclamation mark. Nothing for the news feeds to highlight. Just a move nestled in the darkness of silence. But that is precisely the moment I understand why I am still sitting here at 1 a.m., after every game has closed.

In the chess world, opening-theory products are sold with an irresistible promise: you don't need to memorize, you only need to understand. A new DVD is being promoted for the 9...a5 branch in the King's Indian Mar del Plata, and it claims its territory is "strategic wins, few concrete lines." The question I ask is not whether this move is right or wrong. It is: behind that promise, what is actually being sold?

The King's Indian Defense and the Mar del Plata variation

The King's Indian Defense is a system in which Black deliberately concedes the center from the start: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7, planning a counterattack. The Mar del Plata is its sharpest variation, where Black brings the knight to c6 and pushes the e-pawn to e5, creating a wing race: White attacks queenside, Black attacks kingside. Its ECO code runs from E97 to E99.

In the 1970s and 1980s, Mar del Plata was a strategic weapon for many great names. But as computers became the default preparation tool, this branch narrowed. Not because it is objectively weak, but because it is too exposed. Every line can be calculated; every result can be forced into a clear number.

That is why 9.b4 — the Bayonet Attack — became a nightmare for KID lovers. White grabs queenside space, pushes the pawn to b4, and forces Black to answer. The most popular move is 9...Nh5, bringing the knight to attack f4 and opening a series of forcing lines. Anyone who has opened ChessBase knows 9...Nh5 move by move. So do I. And precisely because I know it, I noticed the difference when someone played 9...a5.

What actually happens after 9...a5

Let me be direct: 9...a5 is not an invention. It is a long-known branch, just not in the most favored group. This move puts a direct question to White's b4-pawn: Black wants to force White to decide immediately — defend b4, push further with b5 (usually not good because it opens lines for Black's counterplay against the pawn structure), or return to building the center.

The appeal of 9...a5 lies in pulling the game off the "rails" of forcing lines. After 9...Nh5, almost every move can be looked up. After 9...a5, Black accepts a more closed position, where understanding long-term plans matters more than remembering sequences. That is why the advertising calls it "a weapon against those who like to memorize."

But I spent the whole night checking the numbers. The biggest problem with this product is not the move — it is that the entire set of technical claims behind it lacks verifiable data. Not a single sample game. No engine evaluation. No win rate, draw rate, or ACPL figure. Only a promise.

Based on my experience tracking games, the 9...a5 branch after White plays b4 a5 (move ten) usually leads to a structure where Black accepts a locked queenside in exchange for counterplay along the a-file or a shift to the center. Objectively, modern engines rate the position as roughly equal, sometimes slightly better for White. But equal does not mean easy. It means the game enters a zone where a player who does not understand the plan will lose because they do not know they are losing.

This is the point I want to stress: a chess branch does not become easy just because it has few theoretical lines. Mar del Plata has always been a battle over space and time. When Black chooses 9...a5, they trade some forced lines for strategic flexibility — but that flexibility only has value for someone with a structural foundation. For a beginner, it can be a self-dug trap.

I have seen this at amateur tournaments in Vietnam, where many young players eagerly bring "low-theory" branches into their games without any middlegame plan. The result is usually a loss in confusion — not because the branch is wrong, but because the player was never taught how to read a closed position. This is the gap such products often exploit.

The blind spot: when advertising overwhelms theory

What troubles me most is not on the board. It is in the wording.

The DVD's promotional copy states that after 9...Nh5, "the position opens up, the lines become forcing, and computer analysis becomes important again." By contrast, 9...a5 "leads to sound positions with very few concrete lines." I read this and think: this is the language of a previous decade, not of this era.

In the neural-network engine era, computers no longer "struggle" with long-term strategic positions as they once did. Modern engines play the KID better than most humans, even in the closed positions people once said machines did not understand. The claim that "computers often do not know how to handle these positions" is a legacy of the pre-AlphaZero era. It rings like a sales point, not a technical truth.

And here is the deeper issue: when an opening product sells the feeling of "going against the computer," it is selling a psychology. It tells the buyer: you don't need to compete with the machine in the dry theoretical zone; you only need to understand people. That sounds beautiful. But on the board, your opponent is a person — and that person may have prepared with exactly the tools the DVD says are useless.

There is a larger paradox: while the ad says "avoid forcing lines," it also promises that "if Black knows what to do, things quickly become dangerous for White." These two claims push against each other. If this branch is so easy, why has it never dominated tournaments? If it is so dangerous, why are no games cited to prove it?

I am used to this kind of advertising. It resembles the "low-memorization defense" promises I read in old blogs — plausible until you enter a real game and realize you still need thirty accurate moves.

Who actually needs this branch?

Interestingly, I do not think 9...a5 is a bad move. I think it is a good move for a very specific group — players with strategic foundations who want to escape forced theory. For a club-level player trying to avoid being "crushed" by someone who prepared carefully with ChessBase, this can be a reasonable choice. It will not help them beat a stronger player, but it helps them bring the game onto their own field.

At International Master level, the story is entirely different. At that level, every branch is checked by engines to the end. If 9...a5 appears in classical games, White will respond within one theory cycle. That is the law of chess: every "weapon" has a day it is neutralized.

So where is the real value of this DVD? Its value is not theoretical superiority — it is the ability to steer the game into a zone where the player feels in control. That is a psychological value, not an objective one. And it is enough to sell.

One compliment must come with one blunt remark: the DVD's structure may be useful for study, but buyers should understand they are buying a perspective, not a solution. And in chess, no solution lasts forever.

A reminder about re-reading the source

There is one technical detail I must mention, because it affects all my assessments. The title of the original article I read seems to refer to a team event in Samarkand — "Round 2 (open): Despite close calls, all top teams grab wins." But the entire content below is about the 9...a5 DVD. The two have nothing to do with each other.

When a text's title deviates from its content, the source has a problem. It may be a data-splicing error, but it also reminds me that even as chess information spreads fast, verification quality does not keep up. And in a transfer window, when everyone races to post news, checking sources is an act of resistance.

This is not the first time I have seen chess theory products promoted with unverifiable claims. I once read an ad claiming a defense system "has been tested in hundreds of grandmaster games." When I checked, there were no games. I learned that if the seller does not provide names, numbers, and sample games, then the figures they cite are figures of belief, not evidence.

The silence of an underrated branch

Back to the board at 1 a.m. I watched that game to the end. Black played 9...a5, and the game entered a long mental duel in which no move was beautiful. White kept a small edge, Black defended patiently, and in the end it was a draw. No one won by a technical knockout. But across forty moves, both sides had to think — not remember.

That is what I want to defend. Not the specific 9...a5 branch, but the possibility of chess zones where memory cannot save you. People say girls know nothing about tactics. So I write for them to read. And I write to remind that the pitch is wider when there is no noise. The same is true on the chessboard. Silence is not emptiness — it is where real plans are born.

Tactics never lie; only those who read them do. But readers only read correctly when they have enough data to read. And the data, here, is still missing.

An open ending

What I await is not the day 9...a5 becomes a dominant move. What I await is the day someone presents real games, real evaluations, and lets the board speak for itself. If this branch truly holds at the highest level, classical games will tell us within a few months. If it disappears, we will know too. The only way to evaluate a chess branch is not to read ads, but to wait for those who dare to play it — with all the silence behind each move. And perhaps, within that silence, we finally hear the board's true voice.