If a solid piece of iron shaped as a doughnut was placed under extreme heat, what would the hole in the middle do?View full teaser and answer
The following task involves several steps, but they are out of order. Arrange them so that a person who follows the steps exactly can perform the task:
You have three heavy beams marked A, B, and C, and want to find out which one is the heaviest. You also have a scale that tells you which of any two beams is heavier, but it does not give the specific weight of any beam. In what order must you perform the following steps to determine which beam is the heaviest, and to mark it accordingly? Assume that all three have different weights.
a) Weigh A against B.
b) Weigh B against C.
c) Weigh A against C.
d) If A is heavier, skip the next three statements.
e) If A is...
Five men and five dogs (each man owned a dog) went hiking. They encountered a river that was swift and deep. The only way to cross it was an abandoned boat, left ashore on their side. But it would only hold three living things. Unfortunately, the dogs were edgy and could not be near another person (not even momentarily) unless its owner was present. One of the dogs attended a highly advanced, highly specialized obedience school and therefore knew how to operate the boat (as the men did) -- the other dogs lack this skill. How did the five men and the five dogs cross the river?View full teaser and answer
An exercise in geometry and being able to use the two powers of the queen—being able to move like a bishop and attack like a rook or move like a rook and attack like a bishop.View solution
In the Yosef family there are 11 children. 7 of them are girls named: Ilana, Tikva, Efrat, Ziva, Lilly, Zahava & Ronit. The rest are boys named: Ofer, Rami, Zalman & Ronny. You have to find out in which order they were born, according to the next 12 statments:
1) The eldest and the youngest are girls.
2) The second youngest starts with an R.
3) The first starts with a Z.
4) Ronny & Ronit were born one after the other, in that order.
5) Ronit is not the youngest, not the 2nd youngest.
6) The youngest child starts with a vowel.
7) The 4th has an M in his/her name.
8) Zalman & Lilly were born one after the other in that order.
9) The 7th ends ...
You're walking down a street, when you see some people gambling on the roadside.
The dealer says:
"There are 10 black balls and 10 white balls in this jar. You are blindfolded and you randomly pick 10 balls. If 5 of the balls you picked are black and the other 5 are white, you lose $2. Otherwise you win $1."
Is the gamble fair?View full teaser and answer
One of the classics of chess was the publication of The Art of Sacrifice in Chess by Rudolf Spielmann. Recently, grandmaster Karsten Muller revised it to make it a 21st century effort and did a great job. He added modern examples and commented on some of the original text. It’s a great textbook to learn attacking play from. Here’s one of the...View solution
Jelly Belly beans were the first jelly beans in outer space when President Reagan sent them on the 1983 flight of the space shuttle Challenger.
Three astronauts had four jelly beans left among them one night - a black, a yellow, a green and a red. No astronaut ate more than one jelly bean and the red bean was definitely eaten. According to the following statements, determine which astronaut ate which jelly bean.
1. If the second astronaut did not eat the yellow or green jelly bean, then the first astronaut ate the red bean.
2. The second astronaut ate the yellow jelly bean, unless the first astronaut ate the red jelly bean.
3. If the third astronaut did not eat the black or yellow ...View full teaser and answer
By changing the third letter of each of the words below, can you make another valid word. You have to change each word such that the third letters will reveal a ten letter word when read downwards. Therefore, what now reads KRZSAPROKD will be a real word. What ten letter word is formed?
Grandmaster Lev Alburt was kind enough to email me this position which GM Judit Polgar pointed out could have occurred during the current world championship match. Mate in 7!View solution
A man has 3 cards face down on a table. One is a jack and two are aces. He knows the order but you do not. You can ask him one yes or no question, but when you do you have to point to one of the cards. If you point to an ace, he will tell the truth, if you point to the jack, he will randomly say yes or no. You have to find one of the aces.View full teaser and answer
After you have dealt about half of the 52 cards for a bridge game (with four players), the phone rings. You put down the undealt cards to answer the phone. When you return, none of the cards has been touched, and no one can remember where the last card was dealt. Without counting the cards in any hand, or the number of cards yet to be dealt, how can you finish dealing rapidly and accurately, giving each player exactly the same cards they would have received if you hadn't been interrupted?View full teaser and answer
A man and a boy who are walking together step out with their right feet. The boy walks three paces while the man walks two. When will they both put their left feet forward together?View full teaser and answer
A famous Nimzovich finish against Alapin in Russia, 1914.View solution
Googlebunnies are creatures that come in two types (spooky and flitty) and two genders (male and female). The spooky males and flitty females always tell the truth; flitty males and spooky females always lie.
You come across 3 Googlebunnies. Determine the type and gender of each based on their statements:
A: Ask B what my type is - he will give a truthful answer. C is flitty.
B: A and I are both males. C is a female.
C: A and B are both females. B is spooky.
Which country or nation has a value of 5?View full teaser and answer
There are 12 gold coins. One of the coins is fake. It is known that a fake coin weighs either slightly less or slightly more than a real coin. Using a balance scale, how can you find the fake coin, and determine if it weighs less or more than a real coin, in only three weighings?View full teaser and answer
Black seems to have things well in hand and is poised to promote to a queen and win, but White has a saving idea to draw.View solution
Five young ladies (Liz, Marge, Sam, Ella and Jenny) went on five different hiking adventures. Each walked a distance of 3, 4, 5, 6, and 7 kilometers (random order). Each were able to take an extraordinary wildlife photograph in different locations (forest, meadow, mountain, river side and bushes) of different animals (rabbit, bird, deer, fox and bear cubs). From the clues below determine where and of what each girl took a photograph of, and the distance each travelled.
1. Liz walked twice as far as the girl who saw the deer. The girl who got a shot of the fox travelled one kilometer less than Jenny. The girl in the bushes was not the one who walked 5 kilometers. The girl on the riverside...View full teaser and answer
Each of the clues below is for a word that begins with "tri". The clues do not refer to the words themselves, but rather to the word that must be added to "tri". eg. "A description of three goods to encourage sales" would be "triad".
1. Where you would find three peas
2. Passing through three intermediate places on the way to your destination
3. To fish with three hooks and bait
4. To hurl three things at once
5. A small container for three liquids
White needs to get one pawn in by any means necessary. Black’s rook will have to be dealt with.View solution