## ERGRO

Add the same sequence of three letters both before and after “ERGRO” in order to form an existing English word.

Add the letters U-N-D to get UNDERGROUND.

## 11 is a Racehorse

Can you figure out what story the following sequence of statements is telling?

• 11 is a racehorse
• 12 is 12
• 1111 race
• 12112

11 is a racehorse. 12 is one (1) too (2). 11 won (1) one (1) race. 12 won (1) one (1) too (2).

## Premove

White to premove a mate in 6.

The sequence of moves is: 1. Qc6+ … 2. Kc5 … 3. Kb5 … 4. Qd7 … 5. Kb6 … 6. Qb7#

## Toggle a Pixel

Toggle one pixel to make this equality correct.

(71+1)×(71-1) = 10×9×…×2×1 = 10!

FEATURED

## Eye of the Dragon

Divide the circle below in two pieces. Then, put the pieces together to get a circle with a dragon, such that the dragon’s eye is at the center of the new circle.

The solution is shown below.

## A Horse in Front, A Car Behind

You are sitting on a plane. There is a horse in front of you and a car behind you. Where are you?

You are on a merry-go-round in an amusement park.

## 4-3-2-1

Move one red ball to turn the sequence 1-2-3-4 into 4-3-2-1.

Take the second-to-last ball and place it between the first two balls on the left.

## Charley and Wilma

Why despite killing dozens of people Charley and Wilma were not punished?

Charley and Wilma were intense hurricanes which formed in August 2004 and October 2005 respectively.

## Cut the Pizza

Cut a circular pizza into 12 congruent slices, such that exactly half of them contain crust.

Remark: We say that a slice contains crust if it shares an arc with the boundary of the pizza (with non-zero measure).

First, cut the pizza into 6 congruent circular triangles, and then split each of them in half, as shown on the image below.

## Not a Prince

What wears a crown but is no Prince,
Is good at standing but cannot sit,
Digs for years but leaves no pit,
And wears its jewels inside of it?