By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

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

I am lying and I always lie. Tell me whether I am lying or telling the truth.

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M