Chess Peace
Can you add all 16 black pieces on the board (king, queen, 2 knights, 2 bishops, 2 rooks, 8 pawns) and get a chess position, in which no piece is attacked by another?
SOLUTION
Yes, you can, as shown in the diagram below.
Category: Brain Teasers
A collection of Math, Chess, Detective, Lateral, Insight, Science, Practical, and Deduction puzzles, carefully curated by Puzzle Prime.
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Three Cards
There are three playing cards in a row. There is a two to the right of a king. There is a diamond to the left of a spade. There is an ace to the left of a heart. There is a heart to the left of a spade. Identify the three cards.
SOLUTION
The cards are an Ace of Diamonds, a King of Hearts, and a Two of Spades.
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Cheryl’s Birthday
Cheryl’s birthday is one of 10 possible dates:
May 15
May 16
May 19
June 17
June 18
July 14
July 16
August 14
August 15
August 17
Cheryl tells the month to Albert and the day to Bernard.
Albert: I don’t know the birthday, but I know Bernard doesn’t know either.
Bernard: I didn’t know at first, but now I do know.
Albert: Now I also know Cheryl’s birthday.
When is Cheryl’s birthday?
SOLUTION
If Albert knows that Bernard doesn’t know when the birthday is, then the birthday can’t be on May 19 or June 18. Also, Albert must know that the birthday can’t be on these dates, so May and June are completely ruled out.
If Bernard can deduce when the birthday is after Albert’s comment, then the birthday can’t be on 14th. The remaining possibilities are July 16, August 15, and August 17.
Finally, if Albert figures out when the birthday is after Bernard’s comment, then the date must be July 16.
Perfect Day
Dear Diary,
This morning, I woke up at 9 o’clock. My first job was to drink a glass of water and brush my teeth. After that, I ate an apple, 2 bananas, and a toast with almond butter for breakfast. Then, I went to the gym for one hour, took a shower, and came back home at eleven. I cooked a few pieces of chicken with sweet potatoes for lunch; ate everything. In the afternoon, I started working on my projects while listening to classical music. In the evening, I went for the 2nd time to the gym, did cardio for half-an-hour, and after that visited my friend’s apartment. We had together one big pizza for dinner and in the end, I fell asleep on his couch.
As you can see, my entire day was perfect, except that my laptop keyboard broke. Can you figure out what’s wrong with it?
SOLUTION
All of the numbers in the text are written using digit symbols except for the ones containing “one” (“one”, “eleven”, “first”). This inconsistency implies that the number “1” key on the keyboard is broken.
A Lady and a Cowboy
A lady and a cowboy lie next to a bullet, a dime, and a hook. As a result, someone is delighted but doesn’t show it. What are they doing?
SOLUTION
In Poker, the Queen is called “lady”, the King is called “cowboy”, the Ace is called “bullet”, the 10 is called “dime”, and the Jack is called “hook”. Thus, the poker player has a straight and that’s why he is delighted.
Monochrome Isosceles Triangle
All points on a circle are colored in blue and red colors. Show that you can inscribe inside the circle an isosceles triangle whose vertices have the same color.
SOLUTION
Inscribe a regular pentagon inside the circle. Three of its five vertices must have the same color, and they form an isosceles triangle.
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Cut and Arrange
Get a piece of paper with dimensions 9×12 with a 1×8 rectangular hole in the middle. Then, cut the paper into two pieces that can be arranged into a square. You can print out the shape below.
SOLUTION
The solution is shown below.
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Schoolyard
Draw 2 squares in the schoolyard in order to separate all students from each other.
SOLUTION
The solution is shown below.
The Frozen Lake
You wake up on a frozen lake in an isolated region. The surface of the lake is frictionless and no grip of any kind can be attained over it. You find just your mobile phone in your pocket, but when you take it out to call for help, you realize there is no reception.
If there is no wind force to help you escape, what are you going to do to avoid freezing to death?
SOLUTION
Throw your phone as hard as you can. Thanks to Newton’s third law of motion and the frictionless lake, you will start sliding away.
I Had 6 Eggs
I had 6 eggs. Broke two, cooked two, ate two. How many do I have left?
SOLUTION
I have 4 eggs left. I had an omelet with the first 2; that’s why I broke them, cooked them, and ate them.