Dr Pepper: Okay. I only requested the deductions to see something more comprehensive than “the water is drunk by the Norwegian and the Japanese is the one who keeps the Zebra.”
Here is a long-winded explanation of ICOT’s solution:
STEP 1
We are told the Norwegian lives in the 1st house (10). It does not matter whether this is counted from the left or from the right. We just need to know the order, not the direction.
From (10) and (15), the 2nd house is Blue. What color is the 1st house? Not Green or Ivory, because they have to be next to each other (6 and the 2nd house is Blue). Not Red, because the Englishman lives there (2). Therefore the 1st house is Yellow.
It follows that Kools are smoked in the 1st house (8) and the Horse is kept in the 2nd house (12).
So what is drunk by the Norwegian in the 1st, Yellow, Kools-filled house? Not Tea since the Ukrainian drinks that (5). Not Coffee since that is drunk in the Green house (4). Not Milk since that is drunk in the 3rd house (9). Not Orange Juice since the drinker of Orange Juice smokes Lucky Strikes (13). Therefore it is Water (the missing beverage) that is drunk by the Norwegian.
STEP 2
So what is smoked in the 2nd, Blue house where we know a Horse is also kept?
Not Kools which are smoked in the 1st house (8). Not Old Gold since that house must have Snails (7).
Let’s suppose Lucky Strikes are smoked here, which means Orange Juice is drunk here (13). Then consider: Who lives here? Not the Norwegian since he lives in the 1st House (10). Not the Englishman since he lives in a Red house (2). Not the Spaniard since he owns a dog (3). Not the Ukrainian since he drinks tea (4). Not the Japanese who smokes Parliaments (14). Since this is an impossible situation, Lucky Strikes are not smoked in the 2nd house.
Let’s suppose Parliaments are smoked here, which means the Japanese man lives here (14). Then consider: What is drunk here? Not Tea since the Ukrainian drinks that (4). Not Coffee since that is drunk in the Green house (4). Not Milk since that is drunk in the 3rd house (9). Not Orange Juice since the drinker of that smokes Lucky Strike (13). Again, since this is an impossible situation, Parliaments are not smoked in the 2nd house.
Therefore, Chesterfields are smoked in the 2nd house.
So who smokes Chesterfields and keeps a Horse in the 2nd, Blue house? Not the Norwegian who lives in the 1st House (10). Not the Englishman who lives in a Red house (2). Not the Spaniard who owns a dog (3). Not the Japanese who smokes Parliaments (14). Therefore, the Ukrainian lives in the 2nd House, where he drinks Tea (5).
STEP 3
Since Chesterfields are smoked in the 2nd house, we know from (11) that the Fox is kept in either the 1st house or the 3rd house.
Let us first assume that the Fox is kept in the 3rd house. Then consider: what is drunk by the man who smokes Old Golds and keeps Snails (7)? We have already ruled out Water and Tea from the above steps. It cannot be Orange Juice since the drinker of that smokes Lucky Strikes (13). It cannot be Milk because that is drunk in the 3rd house (9), where we have assumed a Fox is kept. This leaves Coffee, which we know is drunk in the Green house (4).
So if the Fox is kept in the 3rd house, then someone smokes Old Golds, keeps Snails and drinks Coffee in a Green house. Who can this person be? Not the Norwegian who lives in the 1st house (10). Not the Ukrainian who drinks Tea (5). Not the Englishman who lives in a Red house (2). Not the Japanese who smokes Parliaments (14). Not the Spaniard who owns a Dog (3).
This is impossible. So it follows that the Fox is not kept in the 3rd house, but in the 1st house.
STEP 4
From what we have found so far, we know that Coffee and Orange Juice are drunk in the 4th and 5th houses. It doesn’t matter which is drunk in which; we will just call them the Coffee house and the Orange Juice house.
So where does the man who smokes Old Gold and keeps Snails live? Not the Orange Juice house since Lucky Strike is smoked there (13).
Suppose this man lives in the Coffee house. Then we have someone who smokes Old Gold, keeps Snails and drinks Coffee in a Green (4) house. Again, by the same reasoning in STEP 3, this is impossible.
Therefore, the Old Gold-smoking, Snail-keeping man lives in the 3rd house.
It follows that Parliaments are smoked in the Green, Coffee-drinking house, by the Japanese man (14). This means the Spaniard must be the one who drinks Orange Juice, smokes Lucky Strikes and keeps a Dog. By extension, the Englishman must live in the 3rd house, which is Red. By process of elimination, the Spaniard’s house is the Ivory one.
By now we have filled in every ‘blank’ except one, and it is clear that the Japanese is the one who keeps the Zebra.