Fundamental Theorem
Bottle Logic Brewing

Fundamental TheoremFundamental Theorem
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Bottle Logic Brewing
California, United States
American Imperial Stout
4.29 | pDev: 9.09%
Aug 24, 2022
Mar 07, 2019
Fundamental TheoremFundamental Theorem
Notes: Fundamental Theorem began as a small reservation of the best tasting barrels from the third batch of Fundamental Observation. Over the last two years this same initial liquid has been guided through four successive sets of bourbon barrels, soaking in the bold bourbon spirit and pulling the charred caramel-vanilla essence from the oak as the liquid expanded and condensed throughout the seasons.⁣

At an otherworldly 20.59% ABV, this beer is not for everyone. It’s all bourbon, all barrel, and all elegantly aged and finished with a blend of velvety Madagascar and soft, floral Tahitian vanilla beans.
Recent ratings and reviews. | Log in to view more ratings + sorting options.
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Reviewed by MJSFS from Florida

4.7/5  rDev +9.6%
look: 4 | smell: 4.5 | taste: 5 | feel: 4.25 | overall: 4.75
2019 vintage 500ml bottle poured into a Bottle Logic snifter at 42 degrees.

Zero head, zero lacing, which is expected with this ABV. Inky black body with dark brown highlights.

Aroma is bourbon barrel, dark fruits, leather, vanilla, and coconut. Booziness is eye-watering.

Big time alcohol heat on the palate. Tastes of leather, barrel char, tobacco, and faint vanilla. Needs more vanilla to balance the heat.

Mouthfeel is flat, smooth liquor. Smooth silky and sweet up front. Dry barrel char on the backend.

Overall, if you don’t like bourbon, this isn’t for you. It could’ve benefited from more vanilla to balance out the alcohol, but it’s over 20% so booze heat was to be expected.
Aug 24, 2022
Rated: 5 by Hallertau from Wisconsin

Aug 11, 2022
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Reviewed by WickedBeer from Alabama

3.97/5  rDev -7.5%
look: 4.25 | smell: 3.5 | taste: 4.25 | feel: 3.75 | overall: 4
This has not mellowed one bit; boozy bourbon bomb. Loaded with notes of oak, dark fruit, and ethanol throughout. Vanilla slowly peaks out after some time, but even for me this one could drink smoother. That and it could use more body. Warms really nicely.
Aug 10, 2021
Rated: 4.3 by Chuckdiesel24 from Illinois

Jun 28, 2021
Rated: 4.08 by tehveeonesee from Nevada

Jan 20, 2021
Rated: 4.45 by needMIbeer from Virginia

Nov 09, 2020
Rated: 3.64 by DvdP from Netherlands

Nov 02, 2020
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Reviewed by eppie82 from Illinois

4.17/5  rDev -2.8%
look: 4.25 | smell: 4 | taste: 4.25 | feel: 4 | overall: 4.25
You better like boozy beers if you're drinking this. Boozy on the nose and in the flavor. The hints of vanilla that come out as it warms only serves little to tame some of the booze. Medium mouthfeel. The theme of this beer is boozy though. One of the guys in the share described it as 'bourbon with a shot of beer'.
May 28, 2020
Rated: 4.27 by DVMin98 from North Carolina

Feb 24, 2020
Rated: 2.93 by vfgccp from New York

Feb 09, 2020
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Reviewed by rodmanfor3 from Vermont

4.36/5  rDev +1.6%
look: 4.25 | smell: 4.5 | taste: 4.25 | feel: 4.25 | overall: 4.5
I liked the concept of this beer, but it was a slight miss. The finished product ended up being too boozy without enough of the lovable vanilla flavor that everyone crazes in the Fundamental lineup, thus creating an unbalanced beer.
Jan 27, 2020
Rated: 4.4 by Beerbom from California

Nov 16, 2019
Rated: 4.5 by Hopelessly0 from California

Nov 16, 2019
Rated: 4.49 by cd34 from Illinois

Nov 12, 2019
Rated: 4.63 by cgwami from Canada (MB)

Nov 07, 2019
Rated: 3.67 by YvesB from Belgium

Oct 21, 2019
Rated: 3.76 by Gambyt20 from Illinois

Oct 13, 2019
Rated: 4.09 by StoutSnob40 from California

Oct 05, 2019
Rated: 3.76 by Dizzy242 from Massachusetts

Sep 24, 2019
Rated: 4 by jschott75 from Illinois

Sep 11, 2019
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Reviewed by pants678 from California

3.4/5  rDev -20.7%
look: 4.25 | smell: 4.75 | taste: 2.75 | feel: 2 | overall: 3.5
Black, some light tan foam.

Sugary chocolate syrup and alcohol.

Chocolate liqueur more than anything. Perhaps needs time to settle but as is the bourbon is overwhelming. No coffee, no bitterness.

Particularly hot, in that way doesn't come off as a beer. I want to say thin, rather it's the heat that undercuts the beer.
Sep 01, 2019
Rated: 4.5 by PhineasMcClintock from Massachusetts

Aug 16, 2019
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Reviewed by Knapp85 from Pennsylvania

4.25/5  rDev -0.9%
look: 4.25 | smell: 4.25 | taste: 4.25 | feel: 4.25 | overall: 4.25
Pours a rich black color with a rapid fading mocha head on top. The smell has a ton of boozy heat that stings the nose. There is brownie batter in the mix as well. The taste of the beer has a lot of bourbon flavors, lots of wood and vanilla going on here. The feel is thick and hot, it’s literally like drinking bourbon which is really impressive for it still being a beer. Overall, this is pretty intense. Happy to have had the chance to try it!
Aug 16, 2019
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Reviewed by GreesyFizeek from New York

4.5/5  rDev +4.9%
look: 4.25 | smell: 4.75 | taste: 4.5 | feel: 4 | overall: 4.5
This one pours a very dark black color, with a small head, and no lacing.

This smells pure pure and alive bourbon character, with char, vanilla, roast, gasoline, smoke, caramel, and oak.

Even though you could set the room on fire with this beer, it's still really, really tasty. The pure and unadulterated booziness inherent in the nose isn't as noticeable in the taste, as there's much more of a smoothness. It still tastes a touch prickly, and certainly herbal and bitter. There's also a lot of fudge and vanilla here, brownie batter, with heavy duty oak and searing bourbon. There's a touch of coffee creamer and bitter booze.

This is medium bodied - maybe it's a touch thin - with a lingering booziness on the back end of each sip. It's definitely more drinkable than it should be.

This is Fundamental Observation with the dial turned up to 11. It could have been a messy disaster, but it really did work.
Aug 04, 2019
Rated: 4.5 by smartassboiler from Illinois

Jul 15, 2019
Rated: 4.25 by kmanjohnson from California

Jun 27, 2019
Rated: 4.5 by t2grogan from Arizona

Jun 14, 2019
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Reviewed by Vidblain from Minnesota

4.33/5  rDev +0.9%
look: 4.5 | smell: 4.5 | taste: 4.25 | feel: 4.25 | overall: 4.25
I've had a fair number of the Fundamental series now, and I was quite prepared to have socks knocked from my feet...

There's a tendency within the beer community, I think, to refuse to acknowledge that a beer just isn't ready to drink yet - but I'm going to say it. This beer is a hot, boozy, stick mess. It's tasty, don't get me wrong - but that booze seriously needs some time to mellow. I worry that, in that time, much of the vanilla and chocolate will disappear, which is a damned shame.

Good beer? Yes. Epic, hall of fame beer? I think not.
Jun 09, 2019
Rated: 4.46 by M_chav from New Mexico

Jun 08, 2019
Rated: 5 by ADTaber from South Carolina

Jun 03, 2019
Rated: 4.7 by Eddiehop from Texas

May 31, 2019
Rated: 4.32 by 2beerdogs from California

May 27, 2019
Rated: 4.25 by Eziel from Ohio

May 25, 2019
Rated: 3.76 by mattreitz49 from Florida

May 24, 2019
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Reviewed by Sabtos from Ohio

4.12/5  rDev -4%
look: 4 | smell: 4.5 | taste: 4 | feel: 3.5 | overall: 4.25
Just looking at it is imposing. You can SEE the punishment. It's a pupil burning black. The thin tan blanket quickly dies to nothing but a slick black surface with burning red edges.

And boom, right in your face is hot woody bourbon, not unlike sipping on the real spirit. However, it has a nice char and spice to it, with a complexity that doesn't seem cheap or gimmicky. While it's still somewhat thick like the regular version, and there's smoothing vanilla, it's got a stinging heat through and through, as the semi-dry finish enhances the brownie batter aroma that has managed to survive in this monstrous evolution.

I easily enjoy FO more than this, but this is a unique experience in its own right. If you like higher octane stuff, it doesn't get much better than this.
May 23, 2019
Rated: 4.38 by PrestigeWorldwide from Michigan

May 21, 2019
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Rated by pkalix from California

4.25/5  rDev -0.9%
look: 4.25 | smell: 4.25 | taste: 4.25 | feel: 4.25 | overall: 4.25
bitchin' bottle... very hot. got LEGS!!!! drink it like a shot of bourbon....
May 05, 2019
Rated: 4.53 by Mikeypnh from New Hampshire

Apr 28, 2019
Rated: 4.27 by BarrelAgedG from California

Apr 28, 2019
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Rated by lovindahops from New York

4.93/5  rDev +14.9%
look: 4.75 | smell: 4.75 | taste: 5 | feel: 5 | overall: 5
Only Hill Farmstead makes a better barrel aged beer than this
Apr 27, 2019
Fundamental Theorem from Bottle Logic Brewing
Beer rating: 94 out of 100 with 50 ratings