King's Indian Defense: The 9...a5 Move and the Strategic Gamble Against the Bayonet Attack

In chess opening theory, a new move is usually sold on its sharpness. But another category of product sells on a more seductive promise: helping players escape the maze of lines that the computer has already memorized on their behalf. A new DVD against the Bayonet Attack (9.b4) in the King's Indian Defense has taken exactly that road, and its central character is the move 9...a5.

What stands out is not whether 9...a5 is new or old, but that the product's entire argument rests on one assumption: that computers cannot handle the complex strategic positions this move creates. People call that a shock; I call it data that has not yet been read.

Context: a system that never concedes the center

The King's Indian Defense (KID) is the classic hypermodern defense: Black deliberately concedes central space in order to counterattack. After 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6, the game enters the Mar del Plata Variation — one of the sharpest systems in modern chess, where the two sides attack on opposite wings. White masses on the queenside, Black tears open the kingside, and usually whoever gets there first wins.

In the Mar del Plata, both sides accept risk. White cannot calmly accumulate a small edge, and Black cannot defend passively. It is the kind of position where a single slow move can flip the board, and that is exactly why the theory here is suffocatingly dense.

The Bayonet Attack, White's 9.b4, is the fashionable answer in recent years. It gains queenside space and directly interferes with Black's plans, forcing an immediate decision: react in the center or on the wing.

Black's mainstream choice is 9...Nh5. This move opens the position, produces concrete lines, demands high accuracy and, most importantly, is tied to theory that engines have analyzed down to the last percent. That is why it belongs to players willing to memorize.

The new DVD proposes another path: 9...a5. Instead of diving into forced lines, this move aims for a sound position where strategy dominates and concrete lines are far fewer. It is the kind of recommendation designed for club players who want to understand plans rather than memorize move sequences.

To be clear, this is an opening-theory product, not a specific game. No player is named, no game is cited, and no author is disclosed. That is a significant gap, because the credibility of an opening DVD is tied tightly to the identity and status of the presenter.

Evidence: the promise and the gap behind it

What is offered is a strategic argument. 9...a5 targets positions with few concrete lines, where Black does not need to memorize a mass of moves but only to understand the plans. As packaged, this is an objectively balanced choice that is practically dangerous for White if Black knows the plans.

Technically, the assessment has some basis. 9...a5 is not invented from nothing; it has appeared in top-level play as a space-gaining, tempo-gaining move that attacks the b4-pawn and prepares ...c5 or ...Be6. In other words, the product does not invent a new concept — it repackages an existing sideline into a complete repertoire.

The KID is no stranger to the biggest boards. Garry Kasparov used it as a weapon in his world championship matches, especially against Anatoly Karpov, and those games pushed Mar del Plata theory further than any laboratory could. That is why any new proposal in this system faces brutal comparison.

The KID community can be pictured as split into two camps. The first chases forced main lines, where every move is confirmed by an engine. The second seeks practical, low-theory positions suited to limited preparation time. The DVD on 9...a5 clearly targets the second camp.

But that is also where the data question appears. There is no engine match rate, no ACPL (average centipawn loss), no database statistics, no sample size. The claim that 9...a5 is practically better than 9...Nh5 therefore remains an assertion, not evidence. The transfer market is the only place where people pay for numbers that have not been verified.

Counterintuitive: the promise is aging

This is the crux the buyer should face head-on. The central sales pitch — that computers often cannot handle complex strategic positions — once made sense in a certain era. But in the current engine age, strong programs such as Stockfish and Leela evaluate strategic KID positions reliably. The escape-the-computer edge is therefore eroding over time.

In other words, this product sells practical avoidance, not a theoretical edge. Its value is clearly audience-specific: it suits club players who want to understand plans, and who meet the Bayonet less often than professionals do. Against a well-prepared grandmaster, the real question is whether 9...a5 neutralizes White's best tries — and that cannot be verified from the available material.

There is also a structural layer of risk. A physical DVD is a mature and declining distribution model, increasingly displaced by subscription platforms such as Chessable, streaming lessons and interactive databases. The difference is not small: a static DVD cannot incorporate post-publication engine corrections, while opening content is exactly the kind of thing that is continuously revised.

In another corner of the chess world, a scholastic event has just closed. The European Schools Chess Championship in Tsaghkadzor, Armenia, ended with medals for young champions, woven through with cultural activities. If adult repertoire products revolve around missing numbers, the scholastic stream is a reminder that chess keeps nurturing the next generation — the players who may touch 9...a5 themselves in a few years.

The next-cycle signal

From years of watching King's Indian games at major events, I find the 9...a5 story small, yet it reflects a real crack in the KID community: between those who chase forced main lines and those seeking a practical escape. A product like this exists only when there is real demand — a segment of players who feel squeezed by computer-heavy theory and want a way out.

What is worth tracking is not the advertising, but the data. If 9...a5 appears more and more at major events and scores well at the 2600+ level, the line will upgrade from sideline to viable option. If not, it remains a practical tool for a small group of club players.

Numbers are asceticism: you must give up comfort before you can see the truth. With an opening repertoire, the comfort is the promise that you do not need to study theory. Before buying, a player should ask: if this move were that good, why does it not appear more often at the top tables?