The 9...a5 Move in the King's Indian: Antidote or a Trap of the Opening Market?

A player with the black pieces opens with the King's Indian Defense. His opponent pushes 9.b4 — the infamous Bayonet Attack. He had memorized the first fifteen moves of the main line 9...Nh5, but forgets move sixteen, and collapses in thirty-two moves. That is exactly the situation a new opening DVD is targeting, advertising that the move 9...a5 will save buyers from that very death. I spent two weeks re-reading the marketing copy, cross-checking it against what I know about the Mar del Plata, and what I found does not entirely match the promise. The King's Indian Defense is a classic hypermodern opening: 1.d4 Nf6 2.c4 g6, where Black deliberately concedes the center early in order to counterattack later. In the Mar del Plata variation, Black develops the knight to c6 and the pawn to e5, creating the signature structure of a two-wing race: White attacks the kingside, Black strikes back on the queenside. This is one of the sharpest branches still alive in classical chess. The problem for modern Black lies in the Bayonet Attack — the move 9.b4. White pushes the pawn to b4, grabs queenside space, threatens b5, and tightens the structure. The main line taught by books for decades is 9...Nh5, sending the knight to the rim to prepare f5 and blow the position open. That approach forces both sides into concrete calculation, and in the computer era it turns into a memorization war. Forget one move, and you pay the price. That is fertile ground for opening products. The chess DVD market — the ChessBase-style Fritztrainer — runs on a simple formula: find a fashionable line, find a little-known antidote, package it as a product. The move 9...a5 is this round's pick. Instead of pushing the knight to the rim, Black directly challenges the b4-pawn, steering toward a closed, strategic, low-forcing game. The promise sounds lovely: play chess with thought, not memory. I once made a mistake by trusting my own memory. Back when I was competing, I mis-recorded an opening line in my notebook and lost a game I should have won comfortably. Since then, my rule has been simple: every marketing claim must be verified against data, not belief. And the data here tells a different story from the advertising. Core insight: 9...a5 is not an invention but a known secondary branch. The most important thing to state up front: this is not a novelty. It is a secondary choice within the Mar del Plata system. The advertising never claims it is a new discovery — and that is the only honest point worth noting. The product sells buyers a change in the character of the game, not a theoretical advantage. Understanding this correctly will change how you judge the whole product. Compare the two roads. After 9...Nh5, the position opens up, concrete lines emerge, and the computer becomes an indispensable tool. After 9...a5, Black accepts a more closed position, where long-term plans replace forced sequences. The core promise is less memorization, more strategic thinking. It sounds reasonable, and for a tired amateur it has genuine appeal. But that is a psychological claim, not a technical one. The advertising admits the chances are equal — meaning Black gains no advantage at all, only trades for a different kind of game. Against a well-prepared opponent, it is just one more branch to handle. And here is the key point the marketing omits: 9...a5 has long been in databases. Any White player willing to look it up can find a way to play. An antidote only defeats the lazy opponent, not the good one. The actual structure of the game after 9.b4 a5 is still full of calculation. White may close the center, open the queenside, or shift toward the kingside. Each choice opens its own branches, and none is immune to concrete calculation once Black counterattacks. Saying it has "few concrete lines" is a euphemism: it has few theorized lines, not few lines that require calculation. The transfer market is like a chess endgame: whoever reads the role first breathes a sigh of relief. The same applies here — whoever understands the positional nature of 9...a5 early buys exactly what they need; whoever buys on the promise of "no studying" will be disappointed. Contrarian angle: "computers don't understand" is yesterday's thinking. This is the point where I paused the longest. The advertising writes that after 9...a5, computers often do not know how to handle the arising complex strategic positions. The sentence sounds familiar, like a talking point from the pre-AlphaZero era. The truth is that today's neural-network engines handle long-term King's Indian positions far better than they did a decade ago. The "computers don't get it" argument was once true, but it is obsolete. It survives because it sells — because it flatters the feeling that humans have a private territory machines cannot touch. That is a marketing angle, not a technical truth. This leads to the product's biggest risk: theoretical obsolescence. An antidote, once widely known, gets analyzed back by the opponent. In branches as heavily trodden as the Bayonet, the lifespan of a secret weapon is very short. It must also be said plainly: no author's name is given in the advertising. No title, no track record, no sample games with engine evaluations. A serious opening product must answer who the author is and what evidence it rests on. The silence here is a signal, and not a positive one. Buyers should demand more before spending money. I once sat in an empty stadium during a season without spectators, and realized that when the noise disappears, a system reveals its true breathing rhythm. The same applies here: strip away the glossy marketing, and what remains is a known branch, with nothing magical about it. 9...a5 is a legitimate branch. It is neither a scam nor a silver bullet. For an amateur who wants a system less dependent on memory, it may be worth it. For someone seeking a real opening advantage, it is just one more branch on a long list. What is worth tracking is not the DVD but the board: whether 9...a5 appears in top-level games, and whether White finds an answer within one theory cycle. The real question for a buyer is not "is it strong" but "what problem am I trying to solve." If the answer is memory, perhaps the better path is to learn calculation instead of one more move.