Five houses. Five nationalities. Five drinks, five cigar brands, and five pets. Fifteen clues tell you how they all fit together, leaving one deceptively simple question: Who owns the fish?

This classic logic puzzle is usually called Einstein’s Riddle, Einstein’s Puzzle, or the Zebra Puzzle. It is often claimed that Albert Einstein invented it as a boy and predicted that only 2 percent of people could solve it. There is no reliable evidence for either claim, which is mildly disappointing but also very convenient for the other 98 percent.

A version of the Zebra Puzzle appeared in Life International on December 17, 1962, with its answer published on March 25, 1963. The fish puzzle below is a later variation using different nationalities, drinks, pets, and tobacco brands, but the deductive machinery remains the same. No advanced mathematics is required—just patience, a logic grid, and a willingness to become unusually invested in the beverage preferences of five imaginary homeowners.

What Is Einstein’s Riddle?

There are five houses arranged in a row from left to right. Each house has a different color, and each is occupied by a person of a different nationality. Every owner drinks a different beverage, smokes a different brand of cigar, and keeps a different pet. No two owners share any of those characteristics.

Your task is to use the following clues to determine the owner of the fish.

The 15 Clues

1. The Brit lives in the red house.
2. The Swede keeps dogs as pets.
3. The Dane drinks tea.
4. The green house is immediately to the left of the white house.
5. The owner of the green house drinks coffee.
6. The person who smokes Pall Mall keeps birds.
7. The owner of the yellow house smokes Dunhill.
8. The person living in the center house drinks milk.
9. The Norwegian lives in the first house.
10. The person who smokes Blends lives next to the person who keeps cats.
11. The person who keeps horses lives next to the person who smokes Dunhill.
12. The person who smokes BlueMaster drinks beer.
13. The German smokes Prince.
14. The Norwegian lives next to the blue house.
15. The person who smokes Blends has a neighbor who drinks water.

The Question

Who owns the fish?

Stop here if you want to solve Einstein’s Riddle yourself. The answer—and the step-by-step solution—appears below. The fish, meanwhile, is saying nothing.

Einstein’s Riddle Answer: The German Owns the Fish

The German, who lives in the fourth house, owns the fish. That is the short answer. If you would prefer to know why—and to be reassured that we did not simply ask the fish—the deduction follows.

How to Solve Einstein’s Riddle Step by Step

Number the houses 1 through 5 from left to right. Then create five categories: house color, nationality, beverage, cigar brand, and pet. Each clue either places an item directly or rules out positions until only one remains. It is essentially Sudoku with property taxes.

Step 1: Place the Norwegian and the Blue House

The Norwegian lives in House 1. Because the Norwegian lives next to the blue house, House 2 must be blue.

House 1 cannot be red because the Brit lives in the red house. It cannot be blue because House 2 is blue. It also cannot be green or white because those two houses must sit together in that order, and House 2 is already occupied by blue. Therefore, House 1 is yellow. The owner of the yellow house smokes Dunhill, so the Norwegian in House 1 smokes Dunhill.

House	1	2	3	4	5
Color	Yellow	Blue	?	?	?
Nationality	Norwegian	?	?	?	?
Drink	?	?	?	?	?
Cigar	Dunhill	?	?	?	?
Pet	?	?	?	?	?

Step 2: Determine the Remaining House Colors

The horse owner lives next to the Dunhill smoker. Because the Dunhill smoker is in House 1, the horse must be in House 2.

The center house, House 3, drinks milk. The green house drinks coffee, so House 3 cannot be green. Since the green house must stand immediately to the left of the white house, the green-white pair must occupy Houses 4 and 5. That leaves House 3 as red, which means the Brit lives there.

House	1	2	3	4	5
Color	Yellow	Blue	Red	Green	White
Nationality	Norwegian	?	Brit	?	?
Drink	?	?	Milk	Coffee	?
Cigar	Dunhill	?	?	?	?
Pet	?	Horses	?	?	?

Step 3: Match the Water, Tea, Beer, and Blends

The BlueMaster smoker drinks beer. Houses 3 and 4 already drink milk and coffee, and House 1 smokes Dunhill, so the BlueMaster-and-beer combination must be in either House 2 or House 5.

House 1 cannot drink beer. It also cannot drink tea because the Dane drinks tea and the Norwegian lives in House 1. With milk and coffee already assigned elsewhere, the Norwegian must drink water.

The Blends smoker lives next to someone who drinks water. House 1 has only one neighbor, so the Blends smoker must live in House 2. That eliminates House 2 as the BlueMaster-and-beer house. Therefore, House 5 drinks beer and smokes BlueMaster, while House 2 drinks tea. Since the Dane drinks tea, the Dane lives in House 2.

House	1	2	3	4	5
Color	Yellow	Blue	Red	Green	White
Nationality	Norwegian	Dane	Brit	?	?
Drink	Water	Tea	Milk	Coffee	Beer
Cigar	Dunhill	Blends	?	?	BlueMaster
Pet	?	Horses	?	?	?

Step 4: Place the German and the Swede

The only unassigned nationalities are German and Swede, and they must occupy Houses 4 and 5. The German smokes Prince, so he cannot live in House 5, whose owner smokes BlueMaster. The German therefore lives in House 4 and smokes Prince. The Swede lives in House 5 and keeps dogs.

Step 5: Identify the Remaining Pets

The only cigar brand not yet assigned is Pall Mall, so the Brit in House 3 smokes Pall Mall and therefore keeps birds.

The Blends smoker in House 2 lives next to the cat owner. That cat owner must be in House 1 or House 3. House 3 already has birds, so the Norwegian in House 1 keeps cats.

Four pets are now accounted for: cats in House 1, horses in House 2, birds in House 3, and dogs in House 5. The only pet left is the fish, and the only house without a pet is House 4. Consequently, the German owns the fish.

The Completed Einstein’s Riddle Logic Grid

House	1	2	3	4	5
Color	Yellow	Blue	Red	Green	White
Nationality	Norwegian	Dane	Brit	German	Swede
Drink	Water	Tea	Milk	Coffee	Beer
Cigar	Dunhill	Blends	Pall Mall	Prince	BlueMaster
Pet	Cats	Horses	Birds	Fish	Dogs

Did Albert Einstein Really Write the Riddle?

Probably not—or, more precisely, no evidence has surfaced showing that he did. The puzzle is also sometimes attributed to Lewis Carroll, who was certainly no stranger to the more eccentric corners of literary life, but that claim has the same unfortunate shortage of proof. The earliest widely documented version is the Zebra Puzzle published by Life International in 1962, decades after Einstein’s childhood and long after Carroll’s death.

Nor is there evidence that Einstein declared only 2 percent of the population capable of solving it. That figure appears to be part of the puzzle’s promotional folklore: attach Einstein’s name, insult 98 percent of humanity, and suddenly everyone wants a pencil.

Whatever its true origin, the riddle remains a satisfying exercise in deductive reasoning. You do not need Einstein’s brain to solve it. You merely need to follow the clues carefully and remember that when four people have cats, horses, birds, and dogs, the fifth person is about to acquire a fish whether he planned on it or not.

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