A King's Indian DVD Sells Surprise Without Measuring Its Shelf Life

The product blurb stops at move seven. It gives 7.O-O, then jumps straight to 9.b4 — the Bayonet push. The two moves in between, 7...Nc6 and 8.d5 Ne7, vanish from the text. Ordinary readers skip it. Anyone who has rebuilt a Mar del Plata game on an analysis board does not: without 8.d5 there is no such structure, without 9.b4 there is nothing to sell. A two-move gap in an advertising flyer is the writer's error, and it says more than the rest of the flyer. Pushed out into the corridor at the 2026 AFC Cup, I learned to read matches from what other people left behind. That day it was fourteen high presses broken by Johor Darul Ta'zim's number 8 and number 11. Today it is two moves cut out of a theoretical sequence.

The product is an opening DVD: King's Indian Defense, Classical / Mar del Plata branch, the sequence 7...Nc6 8.d5 Ne7 9.b4. For newcomers, to be explicit: Black pushes the pawn to d5 on move eight to lock the centre, White answers with 9.b4 to open a front on the queenside — the push known as the Bayonet. The theoretical main line is 9...Nh5. The DVD chooses 9...a5.

Four sales arguments: 9...a5 contests the b4 pawn and forces White to commit immediately on the queenside — push b5, or trade on b4 and hand Black the a-file; the game shifts from forced sequences to a battle of judgement; “computers do not understand these positions”; and “objectively, the chances are equal”.

The source has no author, no release date, no product ID, no sample games, no evaluation figure of any kind. In the opening-book and opening-DVD genre, an author's name with a title plus a few sample games is the minimum standard; missing both is missing identification papers. There was no seat for me in the press room. Tactical history always has one — and history keeps only what can be checked.

Start with the strongest part of the product, because it is real. 9...a5 does what the flyer describes: it puts the b4 pawn under pressure, forcing White to choose between b5 — opening the door for Black to strike at the centre — and a trade on b4 that hands Black the a-file. The game leaves the zone of forced sequences and drifts into judgement. The real value of 9...a5 is a reduction in the variance of preparation cost, a practical benefit mislabelled as an objective improvement. Read that sentence a second time and it looks nothing like the first.

The weakest point is the line “computers do not understand”. That is a legacy argument. Since Stockfish 12 shipped in September 2026 with the NNUE evaluation network, and with the maturation of Leela-class engines, closed strategic positions are no longer an engine blind spot at the level the flyer implies. The surviving argument is narrower and different: in 9...a5 positions there are fewer forcing lines to memorise, so the human-machine gap sits in memory more than in understanding. White can still engine-check the position in fifteen minutes. “The engine cannot check it” is the wrong sentence; “the engine does not make you remember less” is the right one.

“Objectively, the chances are equal” is an evaluation with no evidence, presented as data. No eval, no game reference, no database citation. In practice the Mar del Plata structure gives White durable space and a queenside majority plan while Black trades for the initiative; the balance there carries high variance and is not symmetric. I mark the claim unverified and keep the label on.

Then the asymmetric-payoff problem, which the flyer never touches. A low-theory sideline benefits the side that has studied it only until the opponent's preparation catches up. The shelf life of surprise is proportional to the rarity of the move, and nobody measures rarity. On Thursday nights at the club where I sit in Mumbai, a young player won his first game with a rare line, then lost the rematch forty minutes later once his opponent opened a database. What he bought was one win, not a system.

A utility table by rating band, inferred rather than measured: below 2026 Elo, medium to high, because opponents rarely steer into the Bayonet and strategic guidance beats memorised theory; 2026-2400 is the peak, because opponents do prepare main lines and a rare move pays the largest surprise dividend; above 2400, utility falls, because opponents and their seconds already have the move in their files, the rarity edge collapses, and 9...Nh5 reasserts itself.

One more front the flyer leaves empty: White's natural replies. b5, Ba3, Nd2 are all familiar refutation directions in this structure, and none is mentioned. The buyer will find them in game three or four, when opponents start preparing.

Add the time risk. A strategy-first line is hungrier for clock than a forcing line already memorised. In rapid and tiebreaks, the buyer pays in minutes.

The execution blind spot sits elsewhere: with the buyer. The product targets precisely the group that loses because opponents prepare the 9...Nh5 main line better, not the group being outplayed positionally. The language “think for yourself instead of memorising” addresses that pain point exactly. But if the buyer is losing because he misreads structures, a rare move only postpones the moment the structure exposes him. I believe in the diagram, but I believe more in the gaps between diagrams. The gap here is the skill of transferring a structure, which no DVD contains.

One professional detail. 9...a5 was most likely chosen because it is under-explored in public databases — a commercial decision about what sells as a surprise weapon, rather than a conclusion about absolute quality. That does not make it useless. It changes the question: from “is this move stronger than 9...Nh5” to “do I have the hours to turn it into understanding before my opponent opens an engine”.

The person standing at the edge of the pitch sees the whole match, not just what is inside the goal. With this DVD, the edge is the documentation left blank: no author, no sample games, no metrics. The next thing worth buying on the chess market sits in a table that states plainly how many games this line has been played, by whom, and how long it takes to be neutralised. Whoever measures the shelf life of surprise sells something more durable than surprise.