BJCP National · Lesson 12 · Style pool (S0)

The stout family: Irish 15B · Sweet 16A · Oatmeal 16B · Foreign Extra 16D · American 20B

Five stouts, all black and roasty – so roast is the shared floor, not the differentiator. The exam skill here is splitting siblings that look identical in the glass. The engine that separates them is the finish and the mouthfeel: dry-coffee, lactose-sweet, oat-silky, export-strong, or American-hoppy. Read this for the one clause that separates each stout from the one next to it.

Aim. First trap, before you write a word: the stout family spans THREE categories. Irish Stout is 15B (cat 15, Irish Beer). Sweet, Oatmeal and Foreign Extra are 16A / 16B / 16D (cat 16, Dark British Beer). American Stout is 20B (cat 20, American Porter and Stout). Misfiling a category number is free points lost. Second trap: because all five are roasty and black, graders split them on finish + mouthfeel, not colour. Own the one-clause split for each and you own the 40% comparison.

Compress: the one idea

All five are dark, roast-forward stouts built on pale malt + dark roasted malts/grains. They separate on finish and body: Irish is the dry, coffee-like, lightest one (nitro-creamy); Sweet is the lactose-sweetened creamy one with mild non-burnt roast; Oatmeal is the silky/velvety one where oats carry the body; Foreign Extra is the strong, drier, more bitter export one; American is the hoppy, aggressively-roasted, bitter one with citrusy/resiny American hops. Compressed from BJCP 2021 Guidelines, 15B / 16A / 16B / 16D / 20B Overall Impression + Style Comparison.

The five, sensory (IQ method)

Irish Stout 15B – dry, coffee-like, the lightest one

Sense	Write it like this
Aroma	Moderate coffee-like aroma typically dominates; slight dark chocolate, cocoa, or roasted-grain secondary notes. Medium-low esters optional. Low earthy or floral hop optional. [src: 2021 Guidelines 15B]
Appearance	Jet black to deep brown with garnet highlights. Opaque. Thick, creamy, long-lasting tan- to brown-coloured head when on nitro – don't expect that head on a bottle. [src: 2021 Guidelines 15B]
Flavor	Moderate roasted grain/malt, medium to high bitterness. Finish dry and coffee-like to moderately balanced with a touch of caramel/malty sweetness. Bittersweet or unsweetened chocolate possible. Remarkably smooth for the bitterness present. [src: 2021 Guidelines 15B]
Mouthfeel	Medium-light to medium-full body, somewhat creamy (especially on nitro). Low to moderate carbonation. Light roast astringency allowed, harshness undesirable. [src: 2021 Guidelines 15B]

Sweet Stout 16A – lactose-sweetened, coffee-and-cream

Sense	Write it like this
Aroma	Mild roasted grain, sometimes coffee or chocolate notes. An impression of cream-like sweetness often exists. Fruitiness low to moderately high. Low diacetyl optional. Low floral/earthy hop optional. [src: 2021 Guidelines 16A]
Appearance	Very dark brown to black. Clear, if not opaque. Creamy tan to brown head. [src: 2021 Guidelines 16A]
Flavor	Dark, roasted, coffee/chocolate flavors dominate. Low-moderate esters. Moderate bitterness. Medium to high sweetness counterpoints the roast and bitterness, lasting into the finish. Roast is mild, not burnt. [src: 2021 Guidelines 16A]
Mouthfeel	Medium-full to full-bodied and creamy. Low to moderate carbonation. High residual sweetness from unfermented sugars enhances the full-tasting mouthfeel. [src: 2021 Guidelines 16A]

Oatmeal Stout 16B – oat silkiness carries the body

Sense	Write it like this
Aroma	Mild grainy, roasty, coffee-like with a light malty sweetness – a coffee-and-cream impression. Fruitiness low to medium-high. Light grainy-nutty oatmeal aroma optional. Medium-low diacetyl optional but typically absent. [src: 2021 Guidelines 16B]
Appearance	Brown to black. Thick, creamy, persistent tan- to brown-coloured head. Clear, if not opaque. [src: 2021 Guidelines 16B]
Flavor	Mild roasted coffee, milk chocolate, or coffee-and-cream; low to moderately-high fruitiness. Oats add a toasty-nutty, grainy, or earthy flavor. Medium bitterness. Medium-sweet to medium-dry finish. Malty, roasty, nutty aftertaste. [src: 2021 Guidelines 16B]
Mouthfeel	Medium-full to full body, smooth, silky, velvety, sometimes an almost oily slickness from the oatmeal. Creamy. Medium to medium-high carbonation. Stronger versions lightly warming. [src: 2021 Guidelines 16B]

Foreign Extra Stout 16D – strong, drier, prominent roast

Sense	Write it like this
Aroma	Moderate to high roast: coffee, dark chocolate, or lightly burnt grain. Low to medium fruitiness. May have molasses, licorice, dried fruit, or vinous notes; stronger versions a subtle clean alcohol. Low earthy/herbal/floral hop optional. Low diacetyl optional. [src: 2021 Guidelines 16D]
Appearance	Very deep brown to black. Clarity usually obscured by deep colour; clear, if not opaque. Large tan to brown head with good retention. [src: 2021 Guidelines 16D]
Flavor	Moderate to high roast (coffee/dark chocolate/lightly burnt grain) without a sharp bite. Low-medium esters. Medium to high bitterness. Moderately dry finish. Moderate earthy/herbal/floral hop flavor optional. [src: 2021 Guidelines 16D]
Mouthfeel	Medium-full to full body, smooth, sometimes creamy. May have a warming but not hot alcohol presence. Moderate to moderately-high carbonation. [src: 2021 Guidelines 16D]

American Stout 20B – hoppy, aggressively roasted, bitter

Sense	Write it like this
Aroma	Moderate to strong roast, roasted coffee or dark chocolate. Burnt or charcoal acceptable at low levels. Medium to very low hop aroma, often citrusy or resiny. Medium esters optional. Should not seem sharp, acrid, or acidic. [src: 2021 Guidelines 20B]
Appearance	Generally jet black (some very dark brown). Large, persistent light tan to light brown head. Usually opaque. [src: 2021 Guidelines 20B]
Flavor	Moderate to very high roast (coffee, bittersweet chocolate, roasted coffee beans); slightly burnt grounds acceptable but not prominent. Low-medium malt sweetness. Medium to high bitterness. Low to high hop flavor, citrusy or resiny. Medium to dry finish. [src: 2021 Guidelines 20B]
Mouthfeel	Medium to full body, can be somewhat creamy. Bit of roast-derived astringency (not excessive). Medium-high to high carbonation. Light to moderately strong alcohol warmth, smooth, not hot. [src: 2021 Guidelines 20B]

Two brown-black creamy stouts on the table, both coffee-and-cream – how do you split a Sweet from an Oatmeal?

Say it out loud in full sentences before you reveal. Half-answers count as misses.

The Sweet gets its body and finish from added lactose (high residual sweetness); the Oatmeal gets a silky/velvety/oily body from oats and finishes medium-sweet to medium-dry

Guidelines: Sweet Stout has medium-to-high sweetness from unfermented lactose lasting into the finish; Oatmeal has 'enough sweetness to support the oat backbone' with a silky/velvety/oily mouthfeel from the oats and a medium-sweet to medium-dry finish. The lever is WHERE the body comes from and how sweet the finish is.

The spine: each stout in ONE clause (this is the exam skill)

Roast and black colour are shared – never your differentiator. Split on the clause in the right column:

Style	Body + carbonation	The one clause that separates it from its siblings
Irish 15B	Medium-light to medium-full; low-moderate carb	Driest and lightest – coffee-like roast, no added sweetness, nitro creaminess. The lowest-gravity stout. [src: 15B]
Sweet 16A	Medium-full to full, creamy; low-moderate carb	Lactose sweetness – medium-to-high residual sweetness into the finish; mild, non-burnt roast. [src: 16A]
Oatmeal 16B	Medium-full to full, silky/velvety/oily; med to med-high carb	Oat-derived body – silky/velvety slickness from oats; sweetness only supports the oat backbone. [src: 16B]
Foreign Extra 16D	Medium-full to full, smooth; mod to mod-high carb	Export strength + drier + more bitter – prominent roast, IBU 50–70, warming alcohol. [src: 16D]
American 20B	Medium to full; medium-high to high carb	American hops + aggressive roast – citrusy/resiny hop flavor, high bitterness, burnt/charcoal allowed low. [src: 20B]

Traps that cost marks

Sweet Stout roast is MILD, not burnt. Guidelines: "The roast character is mild, not burnt like other stouts." Don't write "burnt/acrid" for 16A – that belongs to American.
American Stout's hop character is the tell. The other four are British/Irish with hops "for bitterness" or optional/absent hop flavor. American 20B has citrusy or resiny American hop flavor and can carry burnt/charcoal – but still "should not seem sharp, acrid, or acidic."
Oatmeal is NOT automatically sweet. The oat signature is the mouthfeel (silky/velvety/oily), not sweetness. Finish is medium-sweet to medium-dry. American versions run less sweet and more hoppy than English ones.
Don't confuse Foreign Extra 16D with Tropical Stout 16C. Same gravity, but 16D is drier with higher bitterness (IBU 50–70); Tropical 16C is much sweeter and fruitier. (16C is a sibling in cat 16 but not in this lesson's five.)

Comparison – win it on the three levers (not just sensory)

Beyond the sensory contrast, the 40% block wants ingredients, process, history – one line each:

Lever	Differentiator across the five
Ingredients	All share pale malt + dark roasted malts/grains (enough to make the beer black). Irish uses roasted barley + may use unmalted grain for body; Sweet adds lactose for residual sweetness; Oatmeal adds oatmeal or malted oats (5–20%+) for silky body; Foreign Extra uses (typically English) hops for bitterness + may boost gravity with adjuncts/sugar; American uses American base malts, yeast, and American hops. [src: Characteristic Ingredients 15B/16A/16B/16D/20B]
Process	Roasted-grain astringency is controlled in all; Irish is traditionally draught with a nitro pour for the creamy head/texture; Sweet leans on unfermentable lactose for sweetness/body while Oatmeal leans on oats for a silky body; Foreign Extra is brewed stronger for export with a drier finish; American applies an aggressive late-hopping regime on a strong roasted base.
History	Irish 15B evolved from London porters; Guinness brewed a "stouter kind of porter" ~1810, diverging late 1800s. Sweet 16A is an early-1900s English "Milk"/"Cream" stout (lactose), marketed as a tonic. Oatmeal 16B is a ~1900 "nourishing/invalid" stout using oats, revived in craft. Foreign Extra 16D is the export line – Guinness FES (orig. West India Porter) first brewed 1801 with extra hops for shelf life. American 20B is a modern craft/homebrew style ("West Coast Stout") applying American hopping to a strong English/Irish stout. [src: History 15B/16A/16B/16D/20B]

One line that separates all five at once?

Say it out loud in full sentences before you reveal. Half-answers count as misses.

Irish is the driest/lightest coffee-roast; Sweet is lactose-sweetened; Oatmeal is oat-silky; Foreign Extra is the strong drier more-bitter export; American is the hoppy aggressively-roasted one

Roast/black is the shared floor. The split is finish + mouthfeel + hop character: dry-coffee (Irish) / lactose-sweet (Sweet) / oat-silky (Oatmeal) / strong-drier-bitter export (Foreign Extra) / American-hoppy (American). That is your pivot sentence.

The official compare lines (verbatim)

Irish 15B: "Lower strength than an Irish Extra Stout. Darker in color (black) than an English Porter (brown)."
Sweet 16A: "Much sweeter and less bitter-tasting than other stouts, except the stronger Tropical Stout. The roast character is mild, not burnt like other stouts. Can be similar in balance to Oatmeal Stout, albeit with more sweetness."
Oatmeal 16B: "Most are like a cross between an Irish Extra Stout and a Sweet Stout with oatmeal added... the drier versions more like a more nutty, flavorful Irish Extra Stout. Both tend to emphasize the body and mouthfeel."
Foreign Extra 16D: "Similar in balance to an Irish Extra Stout, but with more alcohol. Not as big or intense as an Imperial Stout. Lacking the strong bitterness and high late hops of American Stout. Similar gravity as Tropical Stout, but with a drier finish and higher bitterness."
American 20B: "Like a hoppy, bitter, strongly roasted Irish Extra Stout. Much more roast and body than a Black IPA... Stronger and more assertive... than American Porter."

One commercial example each (the 10%) – verbatim from the Guidelines list

Irish Stout 15B: Guinness Draught (also Beamish Irish Stout, Murphy's Irish Stout, O'Hara's Irish Stout).
Sweet Stout 16A: Mackeson's XXX Stout (also Left Hand Milk Stout, Bristol Beer Factory Milk Stout, Lancaster Milk Stout).
Oatmeal Stout 16B: Samuel Smith Oatmeal Stout (also Anderson Valley Barney Flats Oatmeal Stout, St-Ambroise Oatmeal Stout, Young's London Stout).
Foreign Extra Stout 16D: Guinness Foreign Extra Stout (also Coopers Best Extra Stout, The Kernel Export Stout London 1890, Ridgeway Foreign Export Stout).
American Stout 20B: Sierra Nevada Stout (also Deschutes Obsidian Stout, Bell's Kalamazoo Stout, Avery Out of Bounds Stout).

All descriptors compressed verbatim from BJCP 2021 Guidelines, styles 15B, 16A, 16B, 16D, 20B. Three categories: 15 (Irish Beer), 16 (Dark British Beer), 20 (American Porter and Stout). Parameters omitted on purpose: not scored on S0 (V.2023) – the value is sensory prose.