# Questions tagged [mathematics]

A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

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### Two-Move Chess Game

Consider a standard game of chess. We make the following modification: on a turn, if a player makes a move which neither captures a piece nor puts their opponent’s king in check, then they may make a ...
633 views

### How to sell at the buying price and still have something in hand? [closed]

A farmer walked into the cattle market and found the price is fixed at "5 for 2 coins", either buy or sell. He thought a little and then bought cattle of 250 cows for 100 coins (250/5 * 2). ...
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### $\pi$ = 13, $\sqrt{2}$ = 7, $e$ =?

From The Escape Room Advent Calendar: Puzzle book for adults I know the answer to this puzzle. I cannot for the life of me figure out why it is what it is.
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### Which parent should you start playing against?

Let $k < n$, $k$ even, $n$ odd. Mary is to play $n$ chess games against her parents, alternating between her father and mother. To receive her allowance she must win $k$ games in a row. Given the ...
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### Irregularly Deposited Compound Interest

Suppose you have a very peculiar bank account that obeys the following rules: The account pays 10% interest per year, generated continuously. Interest from the account does not compound automatically;...
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