BJCP National · Lesson 19 · Taper read – Thu 13 Aug · consolidation only
Nothing new here. Every item is drawn from your own scored essays between 6 July and 6 August, and the point of grouping them is that they are not ninety separate mistakes – they are ten habits. You cannot rehearse ninety facts the week before an exam. You can hold ten counter-moves.
study/prescriptions/*.md (22 scored essays) and wiki/mock-exams-feedback/. Where a source fact is quoted it is from raw/, as in the prescriptions themselves.
| # | The habit | The counter-move on the page |
|---|---|---|
| 1 | Range truncation – writing one end as if it were the whole | Every sensory value gets two ends, or the word "to". |
| 2 | Head-retention inversion – "persistent" as a reflex | Retention is a separate decision. Ask: does this style hold its head? |
| 3 | Descriptor migration – a neighbour style's word | If the word is vivid, check whose word it is. |
| 4 | Body omitted in mouthfeel | Body, carbonation, finish. Three, every time. |
| 5 | Causes and controls collapsed into one list | Mirror every control into a cause. Count to five. |
| 6 | Sulfate inversion – Burton and Dortmund made soft | Sulfate accents. High minerals = bolder and drier. |
| 7 | Fabrication under clock – plausible mechanism, invented | If you cannot source it, describe the mechanism you can. |
| 8 | Answering the adjacent question | Copy the stem's nouns into the margin before writing. |
| 9 | Blank commercial examples | Write the example first, then the prose. |
| 10 | Quantities without "why appropriate" on R0 | Every ingredient line ends in "because the style…". |
The most frequent single error in your record, and the most invisible, because what you write is never wrong – it is just half the permitted band, and the grader is reading against the full one.
Counter-move. The Guidelines almost never state a single value. If your sentence has one adjective where a range belongs, you have truncated. Writing "medium-light to medium" costs three extra words and closes the whole band.
This one is a reflex, and reflexes do not respond to knowing better – only to a checkpoint. In your record the direction is almost always the same: you write persistent where the source says the head falls.
Counter-move. Head is three decisions, not one phrase: size, colour, retention. Retention is the one you skip, and it is the one that inverts. When you write a head, say the retention word out loud in your head before committing – and remember that the reflex points the wrong way, so "persistent" deserves a second's suspicion every single time.
A vivid, correct BJCP word – attached to the wrong style. This scores worse than a vague word, because it reads as confusion between two things you are being asked to distinguish.
Your documented leech, and it survives because mouthfeel feels written once carbonation and a texture word are on the page.
Counter-move. Mouthfeel = body + carbonation + finish. Appearance = colour + clarity + head. Six words, two rows, and they are worth more than any adjective you could add.
On the cardboard question you wrote hot-side aeration, splashing before packaging, oxygen at packaging and warm storage – under "controls" only – leaving the causes column as the single word "oxidation". The knowledge was on the page; the label was missing. This is also the RTP-flagged failure repeating: 1–3 causes where graders count 5+.
Same shape elsewhere: alcoholic warmth got three causes against a floor of five (missing underpitching, high-gravity wort stress, insufficient oxygenation at pitch, nutrient deficiency, fusel production under stress).
Counter-move, purely mechanical: write the controls, then mirror every control back into a cause and number them. If the numbering stops at three, you are not finished. On C0, count the styles too – three appropriate and three inappropriate, by name. "Inappropriate in every other style" scored zero on a 30% band.
Two city errors, one root cause, and it inverted twice on the same day.
| City | What you wrote | Source |
|---|---|---|
| Burton-on-Trent | "low sulfates … soft bitterness" | Calcium and sulfate far higher than any other city; high sulfate with low sodium gives an assertive, clean hop bitterness. |
| Dortmund | "smooth and round bitterness" | Higher level of all minerals lets brewers make pale lagers bolder, drier and lighter in colour than their Czech counterparts. |
Both reduce to one card: sulfate accents hop bitterness and dryness. If you hold that one sentence in the right direction, neither city can go wrong. The mirror image is equally worth holding: chloride enhances sweetness, and it is chloride, not sulfate, that softens.
The most dangerous mode, because a fabricated mechanism is written with more confidence than a remembered one. Every instance below is a plausible sentence that is not in any source.
Counter-move. When a mechanism arrives fully formed and fluent under time pressure, that fluency is a warning, not a confirmation – it is usually a neighbouring fact wearing this question's clothes. Fall back to the level you can source: "oxidation produces a papery character" is safe; inventing the pathway is not. And add one more suspicion to the list this week: your own reasonable-sounding correction of a source number (see the Vienna kilning trap in Lesson 15).
Counter-move, ten seconds. Before writing, copy the stem's nouns and its number words into the margin: five · considerations · impact on finished beer. Then tick them off as you go. This is the cheapest fix on the whole list and it has failed you twice.
The 10% band, and it has scored zero repeatedly: American Barleywine (no example), American Strong Ale (no example), Old Ale (no example), Helles Bock ("i dont remember"). Conversion is 1/1 on carded styles and 0/5 on uncarded ones – so this is a coverage problem with a known fix, not a memory failure.
Counter-move. Write the commercial example before the prose, the moment you read the style name, while the loci walk is still fresh and before the clock has eaten your working memory. An example parked on the page early cannot time out.
On R0 the 40% band asks for ingredients, why they are appropriate for the target style, quantities, and how the quantities were calculated. On the American IPA recipe there was zero "why appropriate" text for any ingredient – no justification for Citra, US-05, the base malt, or the two-packet pitch. That is roughly half of the biggest band on the question, scoring nothing.
Its companion on the 30% band: German Pils with no lagering period (a cold crash is not lagering), no sparge step, no boil length, no carbonation spec; and Weissbier with "traditionally step mashed" where the source says decoction.
Counter-move. Every ingredient line ends with "because the style …". Every process step ends the same way. See Lesson 16 – the number and the reason are two different bands, and you have been reliably earning only one of them.
Without looking back up: name the ten habits, and for each, the single counter-move you would apply on the page.
Say them out loud on the train if you cannot write. Ten is a memorisable list; ninety facts is not, which is the entire reason this lesson exists.
1 Range truncation → two ends, always. 2 Head retention → size, colour, retention, and suspect "persistent". 3 Descriptor migration → whose word is this? 4 Body → body, carbonation, finish. 5 Causes vs controls → mirror each control into a cause, count to five, name three styles each side. 6 Sulfate → accents bitterness and dryness; chloride is what softens. 7 Fabrication → fluency under clock is a warning; retreat to the sourceable level. 8 Adjacent question → copy the stem's nouns into the margin and tick them. 9 Examples → write them first. 10 R0 → "because the style…" on every ingredient and every step.
Three of these – 2, 4 and 9 – account for the largest share of your lost points and all three are mechanical, not conceptual. If Saturday goes badly on time, those three are still cheap enough to do.