Most accurate way to guess someone's rating

What is the best way to guess someone's rating? 

Measure the distance between their thumb and forefinger and multiply that figure by the product of their age times the number of chess books they own.

/ In my case, that would be 0.5 feet times my age (60) times 60 books, which comes out to 1800, which is a little below my last USCF over the board rating.

//You can't. The only way would be to review a collection of the player's rated games. Before you know it, you could compute a rating.

LOL, one of the best jokes I've ever heard! I'm 62 and I have about 1O books. My rating here is about 1300, I must buy books and stretch my thumb and fingers.

Hahaha. Thanks! It might be a bit awkward to ask their age etc.

Nah if I could get some online games of theirs I would, but I can't at the moment. I am trying to work it out without the use of online games (that path got me in trouble in my last forum!).

At the moment I am 1-1 with them so I can only guess about 1250-1350 at the moment. 

Also @notmtwain, I am yet to buy a book yet, so that's great news for me!

A much better avatar for you, henriques3

It's sort of hard to tell someone's rating without any background. I think you may be able to get it in the ballpark, but that's it. I've been destroyed by lower rated players and I myself have destroyed higher rated players. Overall rating estimates not just your play, but your consistency 

Ouch!!! Hahaha I'm happy to put the season opener behind me!

Also yeah I guess. I was just curious, but we are close enough that we can enjoy good games for now.

0.67X63X1=my real rating is only 42...lol. The only chess book I own is Bobby Fischer Teaches Chess from 1972

The Jets looked like the better team in the first period. I think they will have a good season.

Look at the number after their name.

*puke*

Play them in 3 long time control games. Might be able to get away with 2

Two wins? 

Realistically you should do more than two games and spread it over several days in case they're sick or whatever else but I doubt most people would be satisfied with such an answer

Yeah, we only had time for two that time. I will be looking for more games with them, so that will give me a better indication.

0.25 * 1 * 11 does not equal 1250