9...a5 Against the Bayonet Attack: A Practical Answer for the King's Indian and the Data Gap Behind It

The cover page said Samarkand, Round 7, Uzbekistan continuing to dominate and extending the lead. The body of the document opened onto a chess DVD promoting 9...a5 for Black against the Bayonet Attack in the King's Indian Defense. The two halves never touched once. Across all seven information points extracted from the text, there was no Samarkand, no Round 7 result, no named player, no standings table. I read the body first. Then the cover. Then the body again, more slowly, pencil in hand. Still no Samarkand. When a document contradicts itself on its own first line, its body has to be read again with a stricter measure. But fairness requires a caveat: that body, taken on its own, does contain an opening idea worth a few evenings. CONTEXT: A REAL PAIN FOR THE BLACK SIDE The King's Indian Defense runs 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7. Black deliberately lets White build a broad center, then strikes back at that very center with ...e5, ...c5 and counterplay on both wings. The Mar del Plata Variation, once Black has completed ...e5 and ...Nc6, leads to a closed center with both sides attacking on opposite wings. It is the kind of position I still call a two-way bet: whoever arrives first wins. Then 9.b4, the Bayonet Attack, arrives as a declaration. White pushes a pawn forward to attack before Black can build counterplay. The spearhead points straight at b5, threatening to chase the knight, opening the b-file, seizing queenside space. White makes no secret of the plan: turn the queenside into a springboard, and only then think about the center. Black's orthodox answer is 9...Nh5. The line is strong, sharp and expensive. Once the knight goes to the rim, the position becomes a chain of nearly obligatory moves, dense calculation, engines effectively guiding your hand. For a club player with two evenings a week to study openings, that is a memory debt nobody can repay. This is precisely the pain the product targets: a Black player who wants the King's Indian without being dragged into the 9...Nh5 tunnel. I once loaded the wrong SHB Da Nang tape, and that taught me football does not forgive carelessness. The same rule applies to chess: a wrong label stuck onto a correct document still produces a broken document, until the reader verifies every piece by hand. WHAT 9...a5 ACTUALLY DOES The move 9...a5 attacks the base of the b4 pawn head-on. Black stops arguing about the center; Black forces White to define the queenside structure immediately. After the a-pawns trade, or after White props up b4, the position settles into a shape both sides understand: White plays against the center and the queenside, Black presses on the advanced pawn squares and looks for ...c5 or ...f5 depending on the situation. The value of 9...a5 does not lie in being stronger than 9...Nh5. Its value lies in changing the type of work Black has to do: from memorisation to structural understanding. In terms of sophistication, this is an established practical option, long known, a sideline rather than an invention. It sits alongside the less theorised King's Indian paths where Black accepts a slight spatial concession in exchange for clarity. In terms of practical stability, for club and amateur players the route is fairly reliable: fewer concrete lines, a lighter memory load, and mistakes that come from misreading plans rather than forgetting moves. Against well-prepared opponents that number drops, because they have done their homework. Plan-wise, Black must solve three tasks almost simultaneously. Bring the queenside knight to a better square, usually via ...Na6 or ...Nd7, so it is not chased when the b-pawn advances. Keep the c-pawn flexible, so ...c5 remains a lever rather than an obligation. And prepare ...f5, the kingside punch that decides almost every Mar del Plata line. If Black solves those three on the right rhythm, the position runs smoothly. If the rhythm slips, White's b4 pawn turns into a double-edged blade pointing the other way. And here the document falls silent. No ACPL. No engine match rate. No win rate, no draw rate. Not a single master-level game sample. The promotional page says the position is sound, contains very few concrete lines, and that objectively chances are equal. All three are qualitative claims. That does not automatically make the idea wrong. A sideline can be good even without statistics. But it changes how a buyer should read the product: as a suggestion requiring independent verification, not as a proven conclusion. The phrase «engines often do not know how to handle these positions» is marketing copy, not a technical finding. Engines are not confused. They evaluate everything, including quiet positions. What the author means, translated properly: this is not a position where the engine's first choice decides the quality of the game, so move-match rate becomes a meaningless metric. That is a reasonable point about training method. But it is packaged as a benefit for the buyer, when in substance it only says the buyer must take responsibility for his own plans. And «objectively chances are equal»? Read it as: for a Black player who understands the structure and has prepared, this is a practically balanced position. The Bayonet Attack still stands up theoretically. The biggest unknown in the product is not the move; it is the buyer. Its natural customers are players already familiar with King's Indian structures, who prefer long-term planning to forced variations. For them, 9...a5 is a sensible choice. For newcomers, it can become a psychological trap: buying for the promise of easy equality, then receiving equal but unfamiliar positions, unsure which plan to choose, and losing for reasons that have nothing to do with the opening. In Vietnamese chess clubs I meet the same type of player: learning the rules young, then stalling at club level because opening theory grows faster than the hours they have. For that group, a sideline explained through plans keeps real value, regardless of its theoretical strength. At a deeper level, this product reflects a trend that has taken root in chess over several years: practical repertoires that prioritise understanding over memorisation, aimed at adult improvers and busy club players. The DVD format is older than that trend. Most of the chess-learning market has moved to interactive courses, subscriptions and streaming content, where a learner can click through variations and be tested by exercises. A standalone DVD on a single opening branch is unlikely to create broad impact, and almost certainly will not reach the elite level. CONTRARIAN VIEW: THE BLIND SPOT IS THE BUYER Surprise value has an expiry date. A sideline survives on the opponent being unprepared. Once it spreads at club level, White players who specialise against the King's Indian will add it to their files in one evening. And if they would rather avoid it altogether, they simply switch systems: Samisch, Fianchetto, Averbakh. The preparation burden swings straight back to Black, this time in an opening he knows less well. Opening products tend to show only the lines favourable to the side they are selling. That is an old rule of this market, belonging to no one in particular. The older the DVD, the higher the risk, because engine-assisted improvements on White's side in recent years are absent from it. Buyers may discover this in their third game, when the opponent plays a move the material never mentions. Then comes the heaviest point. When a package cannot keep its own headline straight, the analysis inside deserves matching treatment. Samarkand, Uzbekistan, Round 7 — nothing in the body confirms those lines. This may be a source-assembly error in the processing stage. The cover may belong to an entirely different report. For the reader the outcome is identical: nothing about the Samarkand event, about Uzbekistan, or about any player can be inferred from this document. The transfer market resembles a chess endgame: whoever reads the role first breathes easy. The opening-product market runs on exactly that logic, with different pieces. Here, the role being sold is the low-memorisation answer. And its real price is an understanding of queenside structure, something that cannot be bought inside the box. WHAT TO TRACK A tape loaded wrong at the start of a career is the most expensive lesson: the eye always needs verification. With 9...a5, three things deserve a place on the board. The frequency of the move in game databases, especially between 1500 and 2300. White's score when facing it. And whether any strong player is willing to carry it into a classical-rated game. If, after a hundred recorded games, White still has no antidote and White's score has not risen, then 9...a5 deserves a slot in any King's Indian player's file. If the opposite happens, it returns to its rightful place as a surprise weapon: used once, then put away. As for that document, before believing it, go and find the original article.