King's Indian Mar del Plata: 9...a5 and the Attempt to Neutralize the Bayonet Attack in an Opening DVD

Over more than twenty years of watching the chess world, I have noticed a recurring pattern: the moves packaged as "antidotes" usually contain more questions than answers. This time the subject is an opening DVD on the King's Indian Defense, advertised on the claim that 9...a5 will neutralise the Bayonet Attack — the most popular and most troublesome line Black faces in the Mar del Plata system. What made me stop was not the move itself. The title of the document points to a team-event round report in Samarkand, Uzbekistan. The body inside talks about an opening DVD. Two texts, two subjects, glued into a single package. When a source contradicts itself at the level of its underlying metadata, every technical claim behind it has to be re-read with suspicion. The spatial map never lies — it only exposes what we want to believe. Context: when Black accepts retreat in order to counterattack The King's Indian Defense runs on logic that goes against ordinary intuition. The game opens with 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5. Black deliberately lets White take the centre, falls back to build a structure, then tries to demolish that centre with counterattacks from both wings. It is the classic hypermodern school: concede space first, reclaim it later. The Mar del Plata is the sharpest branch of the system. After 7.O-O Nc6 8.d5 Ne7, Black seals the centre and mass- mobilises toward the kingside, while White advances pawns on the queenside. The two sides enter a race: whoever breaks the other's fortress first wins. That all-or-nothing character makes the Mar del Plata a choice for players who like to gamble, and a nightmare for anyone who hates memorising variations. The Bayonet Attack is White's modern answer: 9.b4. Instead of waiting for Black to open the kingside, White pushes the queenside pawn to attack Black's pawn structure and open lines for the heavy pieces. The move is not about scoring immediately. It is about gaining space, creating a pivot, and above all — forcing Black to make a choice before the structure is ready. Black's main reply is 9...Nh5. This is the option that forces play down a concrete track: the knight jumps to the rim, hits key squares, opens the position. After 9...Nh5 the game enters terrain where both sides must recall dozens of precise variations out to move twenty. That is why it is where engines are at their strongest — and where amateurs are most likely to collapse. Then 9...a5 appears. This document presents it as a different fork: not a sprint, but a war of attrition with a high strategic content. Core analysis: two spatial maps, two philosophies To read 9...a5 correctly, I usually redraw the position after move nine as a map of control. In every King's Indian structure I find what the season never records: repetition — the same squares contested again and again, the same pieces forced to choose positions again and again. After 9.b4, White claims sovereignty on the queenside. The b4-pawn is a spear aimed at Black's a7-b7 pawn structure; it also frees the c4-square, gives the queen a retreat and the rook a file. White's queenside space clearly increases. When Black answers 9...a5, the map changes at once. The move locks down the spear. The a5-pawn hits b4 directly, forcing White to decide: push on with b5 (risky, exposing the structure), trade pawns, or hold and look elsewhere. In most cases White loses the most important tactical lever he had. In return, Black pays a price. The queenside is almost sealed. Black no longer has a chance of a quick counter there. The position shifts into a tug-of-war in the centre and on the kingside, where speed is replaced by patience. That is the core difference from 9...Nh5. If 9...Nh5 opens the position and forces concrete lines, then 9...a5 closes it and opens a wide strategic space where planning matters more than memory. The document calls this an advantage for "players who like to think for themselves rather than memorise". As marketing, this is a smart positioning: it targets the psychology of a large segment of amateur players who do not have the time to cram hundreds of variations. But one technical fact needs stating plainly: 9...a5 is a known secondary branch, not a novelty. It has long existed in theory, and any seriously prepared White player can anticipate it. The value of the document lies in systematising and presenting, not in inventing. This leads to an interesting paradox. If 9...a5 aims to reduce the memorisation burden for Black, then the very act of packaging and selling it widely may quickly turn it into a memorised line. The opening market works by that rule: once enough people know it, it loses its surprise value. The document also makes a claim more notable than the rest: that after 9...a5, "chances are equal". I read this as a positional claim, not a claim of theoretical superiority. Equal here means Black can survive, not that Black is better. That is a large difference the promotional framing tends to blur. Geometrically, the position after 9...a5 gives Black a rarely mentioned benefit: fewer weaknesses to defend. Once the queenside is locked, White also loses the ability to open a quick attack there. Black can commit all resources to the kingside and centre. This is a typical spatial conversion in chess: accept the loss of one zone to control the remaining one tightly. The counter-intuitive angle: where the blind spots are The advertising line that caught my attention most is also the most misleading: that computers often do not know how to handle these complex strategic positions, so if Black knows what to do, things may quickly become dangerous for White. I commentated chess finals for VTC for three years, in the era of classic games that people analysed with books and intuition. Back then the line had some basis. But it belongs to a period that has passed — the era before neural-network engines transformed how machines evaluate long-term positions. Today engines handle King's Indian strategic positions far better than the claim implies. Relying on the "computers don't understand" argument to sell an opening product is a sign of dated thinking, not of a new discovery. Watching games tells me that leading players now prepare with engines for almost every branch, including those labelled "purely strategic". The second blind spot concerns data. The document promises a practical weapon but supplies no quantified figure: no win rate, no draw rate, no average centipawn loss, not a single sample game cited. In my analysis work I always apply the rule of evidence first, conclusion second. An opening product without verifiable data can only have its practical value confirmed by playing it yourself. The third blind spot is the durability of the branch. 9...a5 is not a fortress. It is a narrow path, and a narrow path can be blocked. A well-prepared White player can plausibly find a neutralising plan, especially since the line sits in public databases. When everyone can search for free, the competitive value of a DVD lies in editing quality and narrative, not in the raw moves. There is a human variable the document never mentions. The 9...a5 branch demands Black accept playing with less space for many moves. For amateur players, that psychological endurance is sometimes harder than remembering variations. Someone who buys a DVD expecting a "weapon that needs no memorisation" will still face positions where one small error on move eighteen can end the game. And here is the point I want to stress: every position is a hypothesis until the pieces move. No DVD can replace sitting at the board and taking responsibility for each of your own moves. The final blind spot, and the most worrying from an information standpoint, lies in the document itself. The title speaks of a team-event round in Samarkand. The body speaks of an opening DVD. There is no author name, no title, no King's Indian competitive record. A buyer has no way of assessing the teacher's level before paying. If I were advising a student, I would suggest three steps. First, cross-check the 9...a5 branch against current databases and an engine before adopting it. Second, ask to preview a few sample variations with concrete evaluations. Third, compare with the free material already available, since most opening content today has been published somewhere. A document like this is not without value. For players who dislike forcing lines and want a clear plan to play, 9...a5 offers a coherent path. That is a genuine niche, and it is durable. The problem is distinguishing a useful study tool from an inflated promise. What would confirm the value of this branch I do not intend to conclude. Instead, I set a test that can be verified. Watching games over many years shows a clear pattern: opening theory is only confirmed when it appears in top-level games against well-prepared opponents. If 9...a5 shows up in classical games at the highest level and holds equality, the document's premise will have support. If it only exists in club games, it remains a useful tool but not a theoretical statement. Every line-up is a hypothesis until the ball rolls — and in chess, that ball is the first move on a real board. I will track the frequency of the Bayonet Attack and the frequency of 9...a5 in upcoming major events. Coaching does not produce identical players; we produce different paths. And the path called 9...a5 is still waiting for someone to genuinely verify it.