A King's Indian DVD and 9...a5: a Bayonet Antidote With No Data Attached

On the cover is the line “A farewell triumph: Capablanca wins gold in Buenos Aires 2026”. Inside, the thirteen information points of the product announcement do not mention Capablanca once, do not mention Buenos Aires, do not mention 2026. The entire content is about something else: Black's ninth move in the King's Indian, and the choice of 9...a5 instead of 9...Nh5 when Black faces the Bayonet Attack. I read that announcement three times, the habit of someone who works with data. The first pass to grasp the idea. The second to separate numbers from sales copy. The third to find whether any line addressed the actual scoring rate of the variation. The third pass came back empty: no ACPL, no engine match rate, no reference games, no author name. An opening product sold on purely strategic reasoning, and strategic reasoning does not prove itself. The King's Indian Defense is the classic hypermodern system: 1.d4 Nf6 2.c4 g6, Black concedes the centre to White and then attacks that very centre with ...Bg7, ...d6 and ...e5. The Mar del Plata branch, popularised at the 2026 tournament of the same name, pushes the story to its sharpest: 7...Nc6, usually with 8.d5 Ne7, opening a position of mutual attack on both wings where one wrong move can end the game. The move 9.b4, the Bayonet Attack, is how White disrupts Black's plan: seizing queenside space, slowing ...f7-f5, forcing Black to choose between striking immediately and being squeezed. Over the past few seasons 9.b4 has appeared more frequently in top-level games. Every time a variation becomes fashionable, the opening market produces a product to solve it. That is where this DVD positions itself. It does not promise a reversal. It promises a different route. The product's argument fits in one sentence: 9...Nh5 opens the position, creates forced lines, and when everything is forced the computer becomes the referee again. Whereas 9...a5 keeps a sound position, with few concrete lines, pushing the game toward strategy, where a human must think for themselves. The structure is internally consistent. 9...Nh5 is the traditional main line, sharp and forcing, built on ...f5. 9...a5 is the queenside thrust, stopping b4-b5, keeping the Mar del Plata frame while changing the nature of the fight from tactics to the accumulation of small advantages. For club players the difference is concrete: instead of memorising fifteen moves of a forced line, they learn three or four placement principles and handle the rest themselves. The most noteworthy item among the thirteen information points is that the announcement itself assesses the position as equal. A product willing to say “equal” is a product with little risk of overclaiming. It does not promise an objective advantage; it promises practical difficulty for the opponent. “9...a5 does not need to be stronger, because it forces the opponent to read the maze before the board opens.” The data section, however, is empty. No win-draw-loss rate for the variation in any database, no sample of games, no average centipawn loss. For someone used to demanding three independent sources before concluding, this is a conspicuous silence. Three sources, the way I still work, must have different origins: an engine run, a game database, and commentary from a player who employs the corresponding system. If all three rest on a single number, there is really only one source. Here there is none at all. The biggest weakness sits in the very sentence used as leverage: “computers often do not know how to handle the arising complex strategic positions”. That was true in the era of weak engines. Modern engines handle Mar del Plata structures extremely well, and a buyer who checks will see the gap between the pitch and the reality. Reframe it — from “computers cannot handle this” to “humans struggle with these positions without a guide” — and the argument holds. The second frame cannot be sold with excitement; the first can. There is a second paradox, about the clock. The “few concrete lines, easy to remember” advantage only pays when there is enough time. In rapid and blitz, a strategic position with no forced answer becomes a burden, because you must calculate and calculating costs seconds. The product promises less memorisation; what it actually reduces is the ability to play on reflex. From my experience following Mar del Plata games at open tournaments and club-level practice games, a recurring pattern appears: the player who chooses the strategic branch often wins the first twenty moves, then loses in the transition to the endgame because there is no contingency plan. A low-theory branch does not create a better player; it moves the difficulty later. Then there is the title. A DVD about the King's Indian carrying the name “Capablanca wins gold in Buenos Aires 2026”. Historically the detail is not false: Capablanca was present at the 2026 Buenos Aires Olympiad and took the first-board prize. But it does not connect to any line of the content. It may be the name of an illustrative game inside, or a mis-paired headline from the publisher. The thirteen information points do not confirm it. To me, a title that does not match the content is a signal about editorial process, and editorial process is the first thing I check before trusting an opening product. “The opening market is the only place where people pay for unverified variations.” If I follow this product, I will watch four signals: the frequency of 9.b4 in elite databases, the practical score of 9...a5, the emergence of a strong counter-preparation from White, and the author's name. The fourth decides the most and is the easiest to check. A reputable grandmaster or coach raises confidence in the whole DVD to another level; an unknown name leaves every argument above as argument only. When a variation gets refuted, people call it a shock; I call it data that had not been read yet. If you are a King's Indian player looking for a low-theory branch, 9...a5 is worth testing in a few practice games. Just remember that what you are buying is thinking time, and thinking time only has value if you actually use it to think. And if you play White, the good news is that a “few concrete lines” variation is also a variation easier to defeat with engine preparation than a forced line polished across thousands of games. “The opening is where the meta disappears before the data can be printed into a book.”