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Puzzle 153 


How many squares of any size on this chessboard do not contain a rook?

Rooks On C3, C6, F3, F6

Puzzle Copyright © Kevin Stone

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Puzzle 154 


Which is the odd one out:
CAT DOG GOLDFISH HAMSTER COW

Puzzle Copyright © Kevin Stone

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Puzzle 155 


Assign every letter of the alphabet its numerical value: A=1, B=2, C=3, and so on, up to Z=26.

Can you find any common 6-letter words that have a total over 115?

For example, WIZARD = 23 + 9 + 26 + 1 + 18 + 4 = 81.

Puzzle Copyright © Kevin Stone

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Puzzle 156 


Can you find a five-digit number that has no zeros, and no repeated digits, where:

The first digit is a prime number.
The second digit is the fifth digit minus the first digit.
The third digit is twice the first digit.
The fourth digit is the third digit plus three.
The fifth digit is the difference between the first digit and the fourth digit.
Don't forget that 1 isn't prime, the prime numbers start with 2, 3, 5, …

Puzzle Copyright © Kevin Stone

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