Eight of us go fourth, not back, to protect our king from an attack. What are we?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

Can you spot the man between the coffee bean in the picture below ?

How many words can a pen with half refill write?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?