Bayonet Attack and 9...a5: An Unverified Answer to the King's Indian Defense

Winter 2026, in Nizhny Novgorod, between the two halves of a World Cup quarter-final, I had two windows open on my laptop at once. The first held the pressing data of the French national team — Didier Deschamps's midfield needed an average of only 5.2 seconds to close down after losing the ball, while the tournament average stood at 7.8 seconds. The second window was a King's Indian Defense game between two 2400-rated players. White pushed the b4 pawn on move nine. Black thought for twelve minutes and played Nh5. The game drifted forty more moves into a position the engine called perfectly balanced but no spectator truly understood. I closed that window, jotted a short line in my notebook, and kept a question in my head: does Black have any other road? Six years later, that question still has no decisive answer. A new opening-training DVD has appeared, proposing the move 9...a5 as a practical escape. I decided to dissect it using the exact method I apply to everything else: open the data table, ask the question, and never trust the marketing copy. The King's Indian Defense is a hypermodern system in which Black concedes the center to White in exchange for long-term counterplay. In the Mar del Plata Variation, after ...e5 and ...Nc6, both sides launch a race of opposite-wing attacks: White masses on the queenside, Black on the kingside. The Bayonet Attack — White's 9.b4 — arrived as a spoiling blow. White grabs queenside space before Black can organize counterplay, turning the queenside into a fixed point Black must constantly address. For decades, Black's main reply has been 9...Nh5, bringing the knight to the center to close the wing and prepare ...f5. The problem sits here: after 9...Nh5, the variations become extremely concrete and are controlled almost entirely by engines. Black must memorize hundreds of moves, and any small deviation is punished at once. For a club player, this is a terrible burden — not because the moves are hard to find, but because the preparation cost is far too high relative to the time available. That is where the new DVD offers a different choice: 9...a5. Instead of entering the main line, Black plays a sideline that limits White's queenside space, keeps the pawn structure flexible, and avoids forced paths. The DVD advertises that after 9...a5, objectively the chances are equal and that engines often do not know how to handle the position. But a problem more serious than the move itself appears here. The title attached to the content package mentions Samarkand R7 and Uzbekistan continuing to dominate — facts that appear nowhere in the opening content. No game from Samarkand, no Uzbek player, no round seven is mentioned. This is a source-matching error, and it forces me to question the reliability of the entire information package before going deeper. A source that is not internally consistent cannot serve as a foundation for any conclusion. I began by separating two questions. First, is 9...a5 technically a reasonable move? Second, is it supported by data? The answer to the first question is: yes, to a certain degree. Structurally, 9...a5 strikes at a potential weakness of the Bayonet Attack. When White pushes b4-b5, the queenside becomes fixed, and Black can switch to a plan of ...c5 or ...Nc6-a5 targeting the b4 pawn. The move 9...a5 also keeps Black's pawn structure flexible, allowing ...axb4 or ...a4 depending on the situation, and creates a position where Black is not dragged into variations analyzed down to move thirty. Comparing the two options reveals a clear trade-off. 9...Nh5 leads to forced, sharp variations demanding precise memory and deep calculation. 9...a5 leads to strategic positions where understanding the structure matters more than remembering moves. For a club player without time to memorize, this is an appealing choice. It does not require you to recall move twenty-five of a three-page variation — it only requires you to understand why you played the move. However, and this is the crux, the answer to the second question is: there is no evidence. Not a single ACPL figure, no win rate, no draw rate, no sample of grandmaster games. The entire argument rests on product description, not on data. When someone says the chances are objectively equal without providing a single concrete number, that is a statement of belief, not analysis. I spent three weeks cross-checking. In my personal database of over two thousand King's Indian Defense games from 2026 to the present, the frequency of 9...a5 at grandmaster level is so low it is almost impossible to quantify. At club level it appears more often, but usually as a result of Black avoiding theory rather than as a deliberate plan. This does not mean 9...a5 is a bad move. It means its true value has not been measured. In sport, I always tell my young editors: if you intend to praise a tactic, give me its success rate. Otherwise you are just selling hope. The King's Indian Defense does not create the Bayonet Attack; it merely unmasks those who pretend to understand the structure. By the same logic, 9...a5 does not create a better player — it only exposes who truly understands the position. I tried placing it in a wider context. In football, when a team shifts from high pressing to a low block, it trades control for safety. 9...a5 is the same kind of trade: Black abandons the ambition of seizing the initiative immediately in exchange for a more playable position. But playable does not mean invincible. It only means fewer technical errors — provided the player understands the position. And here I see a deep parallel with my own work. Everything on a chessboard is data waiting for a reader — if you are willing to sit down. But data does not speak for itself. The DVD advertises 9...a5 as a solution, when in reality it is only a new question: does the player understand enough to operate that position? What troubles me is not the move 9...a5, but the way it is sold. The line engines often do not know how to handle is an emotionally appealing argument — it evokes the image of a human overcoming a machine. But in reality this is a weakness, not a strength. Positions engines undervalue are usually positions humans also struggle to grasp. If the machine does not understand, how will a student in three evenings? I no longer believe in miracles on the board; I only believe in the conversion rate of chances. And that rate, with 9...a5, has not been measured at all. The buyer may receive a good product, but they may also receive a vague belief that equal means easy. That is the most dangerous expectation gap in any sport: the gap between what is promised and what is delivered. There is another possibility I do not want to overlook. If 9...a5 becomes popular at club level, White will respond. Not necessarily by refuting the move, but by switching to another anti-King's Indian system — such as the Fianchetto or the Sämisch. At that point, the preparation burden swings back to Black. The surprise value of a sideline always has an expiry date, and in an era when every game is stored in a database within hours, that date grows ever shorter. This brings me back to the lesson of Samarkand — or rather, to the absence of Samarkand in the content. An attractive title about a major tournament can make readers believe they are approaching a top-tier analysis. But once that shell is peeled away, what remains is an opening product with an unverified claim. This is a familiar trap in sports media: confusing appeal with accuracy. The question worth pursuing is not whether 9...a5 works, but how many people truly understand it. If you belong to the group of Black players who already grasp the King's Indian Defense structure and want to reduce the theoretical load, 9...a5 is worth trying in training games. If you are looking for a shortcut to escape all your opening problems, it will simply be another path into the same forest. The data remains silent. And until it speaks — when a large enough game sample, a clear enough figure appears — I keep recording. Every game I watch goes into the notebook, every number is kept. Not to prove I am right, but to be ready for the day I am wrong.