King's Indian Defense and 9...a5: A Strategic Answer to the Bayonet Attack

Last summer, while following a multi-round open tournament, I came across three consecutive games that settled into a familiar structure: the King's Indian Defense, Mar del Plata system, with Black facing the Bayonet Attack. Anyone who has entered this branch knows the feeling — White pushes b4, demands space and initiative, and Black must answer within a few moves. Most replied with Nh5, the orthodox move polished to the last square. But in one game, Black played a5. That game ended in a draw, without drama, without an obvious mistake — and it was precisely its lack of drama that made me want to learn more about this rarely played choice.

It turned out that behind it lay an entire theoretical product. A chess DVD in the Fritztrainer style, the kind of training material common in the ChessBase catalog, promoted as an antidote to the Bayonet Attack. Its content revolves around exactly the move I had just witnessed: 9...a5. I decided to read its introduction carefully, not to buy it, but to understand why a side branch of the King's Indian had been packaged into a strategic promise.

Before dissecting it, the context needs rebuilding. The King's Indian Defense is the archetypal hypermodern opening: Black concedes the center early (1.d4 Nf6 2.c4 g6, then Bg7) and counterattacks that very center. The Mar del Plata is its sharpest branch, with Nc6 and e5, leading to a position where the two sides attack opposite wings — White on the queenside, Black on the kingside. The Bayonet Attack (9.b4) is White's way of seizing queenside space, one of the most fashionable approaches that Black players hate to face. The long-standing popular answer is 9...Nh5. The DVD proposes another direction: 9...a5.

It should be said clearly that 9...Nh5 is not an arbitrary move. It opens the position, it forces the variations to appear, and at the top level it has been validated in countless games. For that reason, anyone proposing to counter the Bayonet with a different move must answer a difficult question: in what way is what you offer better, or is it only different because it leaves the opponent less prepared?

What is interesting is how this product positions itself. Rather than promising a novelty never seen before, it admits that 9...a5 is a known branch. The value being sold is not theoretical originality, but a shift in the character of the game. After 9...Nh5, the position opens up, forcing variations appear, and computer analysis becomes important again. After 9...a5, the marketing says, one gets a sound position with very few concrete lines.

This is a chess-psychology argument more than a theoretical one. It targets a specific segment of players: those who like to think for themselves at the board, who do not want to memorize. I understand the appeal. At club level, the greatest fear of a Black player facing the Bayonet is not being beaten conceptually, but being dragged into a memorization race against an opponent who has prepared more thoroughly. A low-theory move sounds like an escape.

But I want to look more closely at the product's two biggest promises, because both stand on sand.

First comes the claim that both sides have equal chances. This is a statement about the position, not about novelty. It is reasonable to a degree — 9...a5 is a correct opening move, not a blunder. But balance in the King's Indian Mar del Plata is always a fragile notion. The position is sharp by nature; what is called balance often exists only until one side makes the first mistake. The problem is this: not a single number, not a single sample game, not a single index is offered to back the claim. No ACPL, no win rate, no draw rate. Only words.

The second promise, and this is where I want to linger longest: the claim that computers often do not know how to handle these complex strategic positions. This is marketing language dating from before the AlphaZero era, when people still believed computers were strong tactically but weak strategically. After neural-network engines appeared, that belief was reversed. Modern engines handle long-term King's Indian positions far better than the advertising line implies. When a theoretical product still leans on that old premise to sell, I wonder when it was written, and whether it still reflects the reality of the board today.

9...a5 itself is by no means weak. It is a legitimate move, an honorable fallback. The problem lies not in the move but in the marketing frame around it. When a side branch is presented as an antidote, buyers easily imagine they have grasped a complete answer to the Bayonet. The reality of the board is more complex. A well-prepared White player can still find play in this branch; what 9...a5 most likely offers is help for club-level or IM players to escape being pushed into a passive position right out of the opening.

Here I want to add something about the broader context of the King's Indian in the engine era. The system's share of top-level games has fallen markedly. Black must concede space, must accept a position where White has many ways to apply pressure, and in an age when everything can be checked by machine, deliberately entering that asymmetrical position becomes harder to justify. The King's Indian Mar del Plata therefore survives at the top mainly as a surprise weapon, no longer a daily choice. A DVD advertising a side branch of it is thus selling into a niche market.

Placing this product in a broader picture, it belongs to one of chess's most crowded and stable theory markets. This is where DVDs, online courses and databases compete to sell answers to popular lines. The real difference between products rarely lies in pure technical quality, but in how they tell a story and guide the learner. A DVD survives not because it contains variations that free databases lack, but because it offers a structure, a voice, a study path. This turns the claim that computers do not understand these positions into a marketing asset rather than a technical truth — it distinguishes the product from free tools.

If I may argue against myself, I want to say plainly something many opening promoters avoid: in the engine era, what is called low theory almost does not exist at the top level. Every side branch, including 9...a5, can be dug to its end in just a few analysis sessions. What such a product really sells is not freedom from theory, but the feeling of that freedom — something with real psychological value, but which should not be confused with an objective advantage.

Tactics, like people, must know who they are before wanting to be someone else. An opening move, before becoming a weapon, must be understood for what it is. 9...a5 is not magic; it is a strategic choice requiring the player to understand the good and bad structures of the position. If buyers expect a closed solution, they will be disappointed. If they expect a direction to research and develop themselves, they may find real value.

I also noticed a detail about the source material. The title attached to the product refers to a round report of a team event in Samarkand, while the entire body of content discusses the King's Indian DVD. The two do not match. For someone whose job is reading sources, such a mismatch is a red flag: it suggests the promotional material may have been mis-spliced, and that anyone quoting it should verify the original first. In a field where source credibility is everything, this small detail says much about the care taken in packaging.

For players wanting to apply it, I have a pragmatic piece of advice. Before relying on any promise, test the 9...a5 branch with your own database and engine. Watch whether recent top-level games use it, and how it is handled. If a line does not appear in elite practice, that does not mean it is wrong, but it does mean its practical value has not been verified. Independent verification should always come before purchase.

The biggest risk of products like this, in the end, is theoretical obsolescence. An antidote today can become a target for counterattack tomorrow. In the Bayonet branch, already analyzed to exhaustion, the chance that one side finds a counter is very real. The life cycle of an opening idea is thus often shorter than its appearance suggests.

I still keep the impression of that quiet draw. When the cheering stops, I can hear the true breathing of the game. With chess it is the same — quiet draws sometimes tell more than loud wins. 9...a5 may not be the final answer to the Bayonet Attack, but it is a reminder: the board always has room for those who dare take their own path. And the next generation will keep reopening doors that seemed closed.