Six Videos, Seven Openings: The Ledger of Black's Repertoire Against 1.d4

The arithmetic is plain, and the plain arithmetic is the first thing visible. On ChessBase's own promotional page (series: ChessBase´26, "Tips for Beginners", part 32), six videos are offered against seven named opening systems — the London System (1.d4 d5 2.Nf3 Nf6 3.Bf4), the Colle System, the Trompowsky Attack (1.d4 Nf6 2.Bg5), the Torre Attack, the Catalan (1.d4 Nf6 2.c4 e6 3.g3), the Blackmar-Diemer Gambit (1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3) and the Richter-Veresov (1.d4 Nf6 2.Nc3 d5 3.Bg5). The quotient is 6 ÷ 7 = 0.86 — 0.86 videos per opening. The ratio is not an accusation; it is a measure of scope. But when the same list seats the Catalan, a mainline of World Championship preparation, beside the Blackmar-Diemer, widely held insufficient for White against accurate defence, the phrase "one plan per opening" stops being neutral. My first suspicion is not about the missing seventh video. It is about the inconsistency inside the list.

The list did not fall out of the sky. It casts the shadow of a two-decade club-level drift. White declines 2.c4 after 1.d4 d5 because playing it drags in the theory mass of the Slav, the Semi-Slav, the Queen's Gambit Accepted and the Orthodox Queen's Gambit Declined. White wants out of that theory, and the cheapest exits are the London, the Colle, the Torre, the Trompowsky. There is a turn here that did not exist ten years ago: the London is no longer merely an amateur's shelter. It has become a regular weapon at 2700+, with branching theory of its own — the Jobava London, the ...c5/...Qb6 setups, the ...e6/...Bd6 structures, and transpositions into the Slav and Caro-Kann complexes. The player running from mainline theory arrives in another room full of theory.

Provenance first. This article sits on the publisher's own channel, written as advertising for its own product. The product description — which openings, how many videos, what teaching format — is reliable on facts. The evaluative claims — these systems are "extremely dangerous", Black "has to be prepared" — are structurally biased, because the seller wrote them. One more small but real uncertainty: "ChessBase´26" carries more than one reading — a software version, an annual content package, or a subscription tier. The source does not resolve it, so it stays in the pending-verification box.

My method here is simple. In May 2026 I published a reconstruction of Spartak Moscow's title run: 60 league goals against a shot-quality model of 47.3, a +12.7 overperformance I argued was finishing luck rather than structure, with the code, the sample size and the model version attached. Since that week, every number I publish carries a footnote. A model is a receipt to me, not an oracle. So entering the chess-instruction market, the first question is not about efficacy but about accounting: how many openings, how many videos, whose signature, on what sample the claim stands.

The workload is not equal across those seven systems, and the list conceals it. The Catalan is a full mainline with heavy forced-line theory and a permanent place in World Championship preparation. The Colle is a club-level setup answerable with a handful of standard structures. Placing them in one list, measured by one "plan" each, builds a false symmetry in the buyer's head — as if Black's seven tasks were the same size. In practice Black has two jobs: modest preparation against the club systems, serious study against the Catalan. Not showing that difference is not pedagogical simplification; it is a pricing problem.

Two inclusions in the list speak for themselves about the nature of the material. Apart from the Catalan, the six systems do not move alike: the Trompowsky and Richter-Veresov arrive via different move orders after 1...Nf6; the Blackmar-Diemer is a gambit whose Black-side lesson is how to absorb White's attack; the London and Torre are structure-driven positional plans. Compressing seven distinct subjects into six videos means either two systems share one video or one has been passed over. Against the branching reach of the London, that is thin coverage — though for a serialised instalment, it is normal.

The least discussed part of the publisher's copy is the basis of the teacher's authority. The trainer is identified as the Bulgarian coach IM Valeri Lilov. In that single paragraph there is no rating, no competitive record, no student-progress number. Bulgaria's chess-school lineage is a soft signal, not data. Title-based authority (IM) and evidence-based authority are different things. For a "Tips for Beginners" series the title suffices; for a Catalan module it is a thin warrant. The missing rating is probably not accidental — sellers foreground ratings when the rating itself sells.

Shelf life varies too, and that is another unstated account. The core ideas of the Colle, Torre, Blackmar-Diemer and Richter-Veresov will stay nearly static for years. The London will not: White's theory keeps growing, so that module has the shortest useful life. Seven components sold in one package do not share one market lifespan. The buyer pays one price and buys seven different shelf lives.

The real battlefield is not information but arrangement. Nearly everything advertised here is available free elsewhere — streamer content, platform courses, YouTube series. The only reason to pay is curation, sequencing, production quality and integration with the publisher's own tool ecosystem. There is no monopoly on the information.

Being part 32 is itself an economic signal. The serial number says this is not a flagship course but a regular content cadence. Marginal information value per instalment is low; value accrues from continuity and habit. Subscription retention is the actual product here, not the individual title.

When I keep Bangladesh's ledger, I apply the same method. Niaz Murshed in 2026, Ziaur Rahman in 2026, Reefat Bin-Sattar in 2026, Abdullah Al Rakib in 2026, Enamul Hossain Razib in 2026 — five in total, and no home norm tournament since 2026. That list is not memoir; it is a ledger. The same ledger should be opened here: which video covers which system, how long that system's ideas last, and who wrote it.

Now the side that commercial copy omits. If White chooses a risk-free sideline after 1.d4 d5, the burden of accuracy shifts onto Black. White plays for a small but pressure-free edge; Black must equalise and avoid drifting into passive structures at the same time. "White is not ambitious" cannot be read as "Black is comfortable." When instructional material is sold for Black, what is actually being sold is the harder half of the equation. Leaving that asymmetry unstated is a material omission, and it feeds directly into the buyer's expectation arithmetic.

A second counter-argument: the London's own theory mountain means White's escape route ends too. A simple, published Black plan does not stop the theoretical contest — it moves it to another table. A plan everyone knows will be met by a prepared White. Plan-based teaching ages slowly, which is true; it does not buy White any freedom either.

The third is strangest: this market manufactures its own demand. The more visible these systems become in training material, the more club players adopt them. The more White plays them, the more demand rises for Black-side answers. It is a self-reinforcing niche that does not saturate — it reproduces itself.

As pedagogy this is not bad, provided it is not bought under the wrong expectation. Six videos can give a map of seven openings; they cannot give a full repertoire. The London and the Catalan will need separate database work; the other four plans will hold for years.

Signals to watch: the London's usage rate at 2700+, which sets the shelf life of products like this; whether the publisher rotates authors in its beginner series or adds difficulty bands; how quickly AI-driven preparation tools can generate Black-side plans at club level; and how much pressure free substitutes put on price. Rating-first thinking can easily dismiss a fourteen-year-old national champion or a fifty-nine-year-old winner as noise — when the record changes, the model must change with it.

Six or seven is trivia. The real question is this: seven different weights on one side, one uniform measure on the other. A teaching product that will not concede the inconsistency inside its own list is not weak preparation — it is an incomplete ledger.

What this data cannot see: the buyer's actual results, the videos' real effect, the course price, the engagement numbers — none appear in the source. Every assessment here rests on factual description, not proof of efficacy. The sample size is zero; the verdict is therefore pending verification, not final.