9...a5: The Quiet Move and the Revaluation of Strategy in the King's Indian Defence

In the catalogue of a European chess publisher, there is a product advertised in four words: "no memorisation required." It sells a single move — 9...a5 — as an antidote to the Bayonet Attack, the aggressive line currently favoured by elite players in the King's Indian Defence, Mar del Plata variation. What stands out is not the move. It is the way strategy has been priced: a secondary branch packaged as an "answer," and a claim about engines placed on the table as a witness. I once believed in feeling, until a number knocked at my door at 3 a.m. This time the number did not come from an xG table, but from a product catalogue that contains not a single sample game. The King's Indian Defence was born from hypermodern philosophy: Black concedes the centre early, then counterattacks it with ...Bg7, ...d6 and ...e5. The Mar del Plata — with ...Nc6 and ...e5 — is its sharpest branch, where both sides race to attack on opposite wings. White pushes his kingside pawns, Black pushes his queenside pawns, and whoever arrives first wins. For decades this was the strategic weapon of players willing to accept risk — Kasparov, Gelfand, Radjabov. But as the engine evolved, the picture changed. Space control became less valuable than exact move control, and the King's Indian gradually withdrew from the main stage of top events. It survives as a surprise weapon, not a default choice. Around the mid-2010s, the Bayonet Attack — 9.b4 — appeared more often. White pushes the pawn to b4, pressures the queenside, clears the way for b5, and forces Black to find a plan. The most popular response, almost the default in theory books, is 9...Nh5. The knight hops to the rim, the position opens, and White is forced into a concrete sequence of moves. And that is precisely what the product is selling: an escape from that "concreteness." The product — most likely a ChessBase-style Fritztrainer, judging by the promotional register — positions 9...a5 as an antidote. Instead of 9...Nh5 forcing White to calculate move by move, 9...a5 takes another road: Black attacks the b4-pawn itself and invites a strategic game with few forced moves and little theory to memorise. The argument has three layers. The first is technical. 9...a5 is a known move, not a new invention. This matters. In chess theory, a "novelty" — a move never seen in databases — is the most valuable thing, because it forces the opponent to think from scratch. But 9...a5 is not a novelty. It is a recognised sideline, analysed across generations. The second layer is psychological. The advertisement says this move is for "players who like to think for themselves, not memorisers." This is identity-based marketing, aimed at the club-player segment — people who lack the time or the will to memorise thousands of variations. The product does not sell theoretical superiority; it sells cognitive relief. The third layer is the engine claim. The advertisement says 9...Nh5 "opens the position, forces the lines, and makes computer analysis important again," while 9...a5 "leads to sound positions with very few concrete lines." The claim implies that engines "often do not know how to handle" such positions. That is where one must stop. Such language is a legacy of the pre-AlphaZero era. Before neural-network engines appeared, computers were genuinely weak in long-term strategic positions — where a move's value often cannot be measured in centipawns immediately, but only emerges twenty moves later. But since AlphaZero and subsequently Leela and Stockfish NNUE came into use, that gap has narrowed beyond belief. Modern engines are no longer "blind" to long-term strategic positions like the Mar del Plata. In other words: the advertisement is selling an advantage that has already been neutralised by the times. This is not an ethical failing; it is a failing of time. Let us try to quantify it somewhat. A serious opening-theory product usually supplies at least one of three things: engine evaluations attached to each variation; sample games from top-level events showing the move has been validated; or an author's name with personal results in that system. Here, there is none. Not a game, not a Stockfish evaluation, not a name. Only a claim. I once believed in feeling, until a number knocked at my door at 3 a.m. The number here is an absence — and that absence is itself a negative number. But wait. Before dismissing this product, one must note that its strategic argument is not wrong in essence. The Bayonet Attack really is an uncomfortable move, really is fashionable, and club-level players really do need an option beyond the long calculating road. The demand is real. The problem lies elsewhere. When a known move is advertised as an "antidote," buyers often confuse two things: convenience and superiority. 9...a5 is more convenient to learn. It is not objectively superior. The advertisement quietly admits this — it says "chances are equal," which is a positional statement, not a novelty claim. And there is a deeper layer. Suppose 9...a5 genuinely succeeds in practice. What happens next? In chess theory, every "antidote" breeds a "counter-antidote." Well-prepared White players will find a plan and publish it in the databases. The life cycle of a sideline like 9...a5 tends to be short — months to years, depending on whether 2700+ players adopt it. If the move does not appear in top classical games, attention fades. That is the law of the theory market. It is not like the transfer market, where a single contract can generate headlines for weeks. Here, the only meaningful signal is how often the move appears in top-level game databases. And this is the point most analyses overlook: the Bayonet Attack is not a poor move. It exists because it works. Pushing the pawn to b4 forces Black to have a clear plan; otherwise White can play b5, Nc2, and gradually tighten the grip on the queenside. The fact that 9...a5 becomes a valid option does not make White's position worse; it merely means Black has one more way to hold. Any article that discusses only Black's move while forgetting White's betrays the nature of the game. Chess has two colours. A strong move for Black is often just a challenge laid before White to prove he has prepared. The last point — and perhaps the most important — concerns sourcing. The title of the original document used as the basis for this analysis describes a team round report in Samarkand ("R2 (open): Despite close calls, all top teams grab wins"). But the entire inner content concerns an opening-instructional DVD. This is not a minor mix-up. It is a red flag about source quality. When title and body do not match, nothing guarantees that the rest of the information is reliable. Anyone rewriting — or citing — must verify against the original source before use. In my trade there is an unwritten rule: a wrong number is worse than a missing number. Information attributed to the wrong source is worse than no information at all. The Samarkand headline attached to DVD content is such a misattribution. So is the product worth buying? The answer depends on who you are. If you are a club-level player who wants to play the King's Indian without memorising hundreds of variations, then a structured guide — even one based on a sideline — still has value. It saves time and gives you a skeleton to start from. If you play at a level where opponents are well prepared, that value drops very quickly. At that level, what decides is not which move you choose, but how deeply you understand the position after the move is played. And if you are a chess-news reader, the notable signal is not 9...a5. It is how a sideline is packaged as a solution, and how an outdated technical claim is still used as a sales tool. The chess theory market, in the end, resembles the transfer market in one respect: it does not buy the past. It buys what the data has forgiven. And here, the data has said nothing at all. I will track this variation. Not with inspiration, but by opening the database and counting. Because there are moves that have been forgotten, and the data never forgets them. But there are also moves that are remembered too much, and the data has never confirmed them. When the chess stadium is empty — when there is no audience, no headline, only a board and two players — the true value of a move begins to speak.