9...a5 and the Promise of "Few Concrete Lines": The King's Indian in the Engine Era

There is a sentence in the promotional text that made me read it three times. 9...a5, the writer claims, leads to sound positions with very few concrete lines. Fourteen words, and inside those fourteen words sits an entire promise of relief. I remember an evening at a small chess club in Binh Duong. A young man of about twenty sat over his board, playing the King's Indian Defence, and on the ninth move his opponent pushed the pawn to b4. He stopped. The digital clock counted every second. He could not recall the tenth move he had memorised. On his face was an expression I have seen hundreds of times: the feeling of being abandoned by theory in the middle of a game. Every opening product aims at that moment. Not at glory. At panic. The King's Indian Defence is one of the strangest systems in modern chess. Black deliberately surrenders the entire centre to White in the early moves, then comes back to attack that very centre with ...e5 and ...c5. In the Mar del Plata variation — the sharpest branch of the system, falling roughly within ECO codes E97 to E99 — Black develops the knight to c6, pushes the pawn to e5, and both sides race: White attacks the queenside, Black attacks the kingside. Whoever arrives first wins. There is no second line of defence. The variation takes its name from the tournament in Mar del Plata, Argentina, in 2026, according to standard opening-theory literature, and nearly seven decades later it retains the same double character: both a surprise weapon and a burden of memory. Once the Bayonet Attack became fashionable, the picture tilted towards White. The Bayonet Attack is the move 9.b4 — White pushes the pawn to b4 before Black can stabilise the queenside, gaining space and clearing the way for a4 next. It is the sort of play that young, computer-raised players love, because it is concrete, it contains tactics, and it forces Black to remember. Black's orthodox answer has long been 9...Nh5. The knight jumps to the rim, hits the f4 square, and forces White to calculate immediately. 9...Nh5 opens the position, forces the lines to appear, and makes computer analysis important again. In other words, it drags both sides into a war of memory and speed. The promotional text I read proposes a different road: 9...a5. Black does not jump with the knight but pushes the rook's pawn to strike directly at the b4 pawn that has just advanced. The idea is to slow the tempo, pull the game away from forced lines, and turn it into a strategic wrestling match. The writer calls it an antidote to the Bayonet Attack, meant for players who prefer to think for themselves rather than memorise. That is where the story begins. And it is also where the story starts to have problems. Over many years of following elite games through open databases, I have learned a reflex: before accepting a technical promise, go looking for the number behind it. With this product, I searched for a long time and found no number at all. The promotional text offers no sample game. There is no move-quality index against an engine. There is no win rate, no draw rate, no database statistic. There is no author's name, no title, no record of the writer's own results in the Mar del Plata itself. An opening product sold on a feeling of safety, without offering a single piece of evidence to test that feeling. What is worth noting is that 9...a5 is not new at all. It is a known branch, recorded in theory for a long time, and its position is fairly clear: a secondary line. The main move remains 9...Nh5. The product does not advertise an invention; it advertises a reworked treatment of an old branch. That is not wrong. But it differs from the impression a reader easily carries away when holding something labelled an antidote. Then comes the sentence that stopped me longest: computers often do not know how to handle these complex strategic positions. That sentence was once true, at a moment that has passed. It belongs to the pre-AlphaZero generation of engines, when analysis tools were strong in mid-game combinations and awkward in long-term plans. Today's neural-network machines handle King's Indian positions far better than that sentence implies. This is dated marketing language dressed up as technical truth. If we set the exaggeration aside, the product's real promise is modest and quite reasonable: change the battlefield. After 9...Nh5, the game unfolds on terrain for which both sides have already prepared a map. After 9...a5, Black deliberately pulls White off that map. The b4 pawn is attacked, the tempo slows, and what goes on the scales is no longer a line but the ability to read a position. That value is practical and psychological rather than theoretically superior. The promotional text itself admits chances are equal, and that phrasing is more honest than the gloss around it. Equal does not mean easy. Equal simply means nobody is being handed a gift. It also needs to be said plainly: the King's Indian Mar del Plata has never stopped being sharp. No line removes calculation from this game. The promise of very few concrete lines is true at the level of memory and false at the level of thought. A buyer hoping to escape memorisation receives a different form of homework, not a rest. The board holds more than pieces; it holds the calluses of a life — and those calluses do not vanish when we change opening. The way the writer targets the buyer is worth noticing too. The product aims at players who like to think for themselves rather than memorise. That is identity-based selling: buy this so you become the kind of player you wish you were. It works, and it is also a signal for the buyer to stay awake. The opening-theory market is crowded. A DVD must compete with free databases, with community study archives, with analysis tools anyone can open in three seconds. The seller's real difficulty is that everyone has the lines, and what can be sold is the narration, the curation, the feeling of being guided. Read with that in mind, this product is better understood as a handbook, a re-presentation of existing knowledge, rather than a piece of original research. And here the detail appears that made me put the whole document down. The title of the package speaks of a team round in Samarkand, describing top teams grinding out narrow wins. The entire body speaks of an opening DVD. The two texts have nothing to do with each other. Not a game, not a team, not a result, not a pairing appears in the body to connect it to the title. For someone in my trade, that detail is graver than any argument about the ninth move. It says the input data was spliced incorrectly at the aggregation stage. A headline about a tournament in Uzbekistan was pasted onto a product blurb. A reader could then quote it wrongly, attribute it wrongly, and turn a round report into an opening advertisement that its own writer never knew about. The game ends, but the sound of the pieces still echoes in my memory — and I have to add that it echoes in places where it does not belong. A second paradox lies in the sales pitch itself. A product that teaches openings is, by nature, a product of memory. It helps a player remember less, but still forces them to remember something else. The writer promises liberation from the library, then hands over a smaller bookshelf. The relief is real. The freedom is not. A third paradox is the lifespan of a weapon. A move called an antidote holds its value only as long as the other side has not finished sharpening its blade. 9...a5 has sat in books for years; well-prepared Bayonet players already have answers, and once White builds a reliable structure the surprise evaporates, leaving exactly the position 9...a5 creates: a long positional struggle both sides must endure. The love of chess does not switch off, it only changes colour — but an opening edge changes colour far faster. So what should an ordinary player do with this promise? I would split it in two. The first part is the strategic idea, and the idea stands: turning a forced game into an open game is a real skill, and many Vietnamese players lack precisely that skill. The second part is the technical claim, and that part needs verification by a thinking engine, by a database, and by a few real games at the level the buyer actually plays. When there is no audience, chess returns to the sound of its own breathing. In small clubs there is no breathing beyond the pieces on the board and the ticking clock. It is precisely there that a move like 9...a5 reveals its true value: it offers the weaker side a way out of panic, in exchange for a longer, more tiring, and more honest game. That is what I want to keep after closing the document. 9...a5 does not save Black from the King's Indian, and it does not need to. It simply gives Black room to breathe. In chess, and perhaps in many other things, room to breathe is sometimes gift enough.