9...a5: Accounting for a Club-Level Antidote to the Bayonet Attack

On move nine, White pushed the b-pawn to b4. At the next table a coach tapped his pen twice against the wood. I know that sound. It is not the sound of good chess; it is the sound of 'this line again.' The lights had already begun to dim in the Bangladesh Chess Federation hall during the Premier Division Chess League, and the local player on one side of the board had a bank clerk's hands — office in the morning, board in the evening. Opposite him sat a guest grandmaster rented by the club. The local player had memorised the Bayonet Attack from a Facebook thread, three moves deep. The guest had...a5 written in his file for exactly this line. Five minutes later the position had become unfamiliar to the man who had prepared it.

That evening is why I cannot stop thinking about how the chess-theory market actually works. Six months later a DVD advert landed in my hands, titled 'King's Indian Attack at the Olympiad.' There is no King's Indian Attack inside it. What is inside is the sharpest branch of the King's Indian Defence, the Mar del Plata.

The title refers to White's system — the King's Indian Attack that begins 1.Nf3 and 2.g3 and only later claims the centre with d3 and e4. Every information point inside the product, however, concerns Black's defence: 1.d4 Nf6 2.c4 g6,...Bg7,...d6,...0-0,...e5, 7...Nc6 8.d5 Ne7, and then the recommendation 9...a5 against White's 9.b4. The product belongs to the Smart Moves series, presented by a titled player and distributed in the ChessBase manner.

In a large market that mismatch would be a reason to scroll past. In ours it carries a different price. Buying an instructional product here means making a decision against a monthly budget. A junior who practises daily receives one or two resources a year; a club board-three adds another expense beside entry fees and travel. Someone searching for the King's Indian Attack and buying the King's Indian Defence has not encountered a small SEO glitch. He has lost a season.

Batumi taught me to read dossiers like weather reports. In 2026 I was on Bangladesh's support staff at the 43rd Olympiad and built forty-page files on all eleven opposing teams — who sits comfortably against which system on board one, whose endgame is fragile. The federation later reused those files as a template. Nowhere in those forty pages was 9...a5 written. That is not a complaint, it is a signal: the market for Olympiad-adjacent theory has the main line at its centre, never the sideline.

It helps to state plainly what the Mar del Plata is. In the King's Indian, Black concedes the centre early and strikes back with...e5. The Mar del Plata is the sharpest expression of that idea: both sides attack on opposite wings, Black storming with...f5 and...f4, White entering via c5 and b5. No pieces are traded for a long time, but every single move has to be accounted for.

White's 9.b4 — the Bayonet — changes the tempo of that war. White takes space on the queenside, keeps the threat of dislodging a knight on b5, and disrupts Black's familiar setup. Black is forced to deal with the queenside before beginning the kingside march.

The main answer is 9...Nh5. Black swings the knight to the kingside, hits the centre with...f5, and drags White through a corridor of concrete lines. Analysis of that branch shows a heavy memorisation load; one move in the wrong direction and the position tilts towards White.

9...a5 takes another route. Black first fixes the queenside, questions White's b5 advance, and keeps both the...c5 and...f5 plans open. The emphasis falls on judgement rather than recall. This is precisely where the product sells itself — strategy, not tactics — and the barb in that sentence points straight at the memorisation culture of the engine era.

The target audience is chosen accordingly: club players roughly between 1600 and 2200 who would rather think than memorise long variations. For that group the appeal of a sideline is genuine.

The trouble begins in the language of evaluation. The promotion states that objectively the chances are equal. There is no database statistic, no engine match rate, no average centipawn loss — 'equal' here is a marketing-normalised assessment, not a measurement. In practice 9...a5 is playable and recognised, but it generally generates less pressure than 9...Nh5. The gap looks small, and it is exactly what sets the price of the product.

The second claim is older still: that computers often cannot handle these positions. Engines handle closed, strategic King's Indian positions better than humans do; the problem was never the engine, it was human capacity to memorise. That sentence belongs to a pre-engine promotional idiom, and the curiosity is that the people most irritated by engine culture are the ones most likely to respond to it.

Our own reality sits outside this argument. A local board-three in the Premier League meets a 2500 once a year, not once a week. For him theoretical depth matters less than judgement. On that accounting the product has real but narrow value.

And here is the counter-intuitive part. 'Few concrete lines' does not mean less risk; it means risk relocating — from the memory to the judgement. At club level, judgement is exactly what is in short supply. A player who jumps into 9...a5 without understanding the structure arrives in a position with no forced moves: no way to lose quickly, and no plan to win. That feels like comfort. It is actually emptiness.

I tagged 640 games before I understood that the question was never the bedroom. That file held Premier League and National Championship games, each tagged by pawn structure and endgame type. The pattern was clean: club players rarely lose in the opening. They lose in the endgame types they never studied separately. Empty halls sent me to online boards for noise, and the noise was not there either.

Bangladesh's problem is not the repertoire, it is the pipeline. Niaz Murshed became South Asia's first grandmaster in 2026, and a sixth grandmaster still does not exist. After the school circuit died in 2026, National Championship entries fell by more than half. The federation's annual grant is small enough that hosting a home norm tournament is not even on the table. Rani Hamid's board and teenager Neer's board sit at two ends, with no institutional middle between them. Inside that emptiness, buying a DVD means building your own pipeline with your own money.

So the question is not whether 9...a5 is good or bad. The question is how many people will be able to play it well. At the next National Championship and league I will count that move. If it reaches club boards within a season and those players start winning inside the resulting structures, the product taught something. If the move arrives and the positions collapse anyway, then what was sold was the feeling of resistance, not resistance itself.