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Dogs

Games / Brain Teasers /

There are two dogs, a black one and a white one. One is male. What is the probability they are both male?

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White to Play

Games / Chess Puzzles /

A delightful mate in 4 to end the week. There are lots of mates in 5, but only one mate in 4!

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Acquainted

Games / Brain Teasers /

You and your spouse invite four other couples to a party. During the course of the conversation, it is discovered that, prior to the party, each person except you was acquainted with a different number of the people present. Assuming the acquaintance relationship is symmetric (i.e., if you are acquainted with someone, that person is also acquainted with you), then how many people did your spouse know prior to the party? How many people did you know?

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Three Creatures

Games / Brain Teasers /

There were three creatures outside a building. One of the creatures did not move itself but entered the building and knew that it was in the building. The second creature moved itself, entered the building, and knew that it was in the building. The last creature did not move itself but entered the building, and the creature did not know that it was in the building. What are the three creatures?

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White to Play

Games / Chess Puzzles /

White has sacrificed two pieces to get the Black king into the open. What is the most efficient way to finish him off?

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World Series Gamble

Games / Brain Teasers /

The winner of the World Series is the first team to win four games, so the maximum number of games that could be played is 7. You want to place a $100 bet (even money) on your team to win the whole series. A bookie says he will not take bets on the whole series, but would be willing to let you bet on each individual game. Is there a betting strategy you could put in place to replicate your $100 bet?

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Fred and Ethel

Games / Brain Teasers /

Fred and Ethel go to the golf course. They meet 3 other couples there, and everybody gets introduced. After introductions, Fred asks everyone how many hands they shook. He gets seven different answers. Presume that no one shook their partner's hand

How many hands did Ethel shake?

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White to Play

Games / Chess Puzzles /

This game, Kofman-Filatov, 1962, reached the diagram position. What move did White play to win the game?

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Even So

Games / Brain Teasers /

What's the secret to the sequence? What's the next number?

4, 5, 9, 11, 12, 13, 14...

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Lost City of Kebabylon

Games / Brain Teasers /

Once again, Madadia's insipid explorer, Wigan Smith is on the trail of lost treasure. He has come across a map showing that somewhere in the middle of the Chillivalley desert, there is the lost city of "Kebabylon". To reach it, he will have to travel overland by foot from the coast. On a trek like this, each person who goes on the journey can only carry enough rations for one person for five days and the farthest Wigan Smith and his group can travel in one day is 30 miles. Also, "Kebabylon" is 120 miles from the starting point.

What Wigan Smith is trying to figure out is the fewest number of persons, including himself, that he will need in his group so that he can reach the "Kebabylon", ...

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Today or Tomorrow

Games / Brain Teasers /

When the day before yesterday was referred to as the day after tomorrow, the day that was then called yesterday was as far away from the day we now call tomorrow as yesterday is from the day which we shall now be able to speak of last Monday as a week ago yesterday. What day is it?

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White to Play

Games / Chess Puzzles /

The following game, which leads to the diagrammed position, has been played at least a half-dozen times in chess history. It starts out 1. e4 c6 2. d4 d5 3. f3 dxe4 4. fxe4 e5 5. Nf3 exd4 6. Bc4 Bb4+ 7. c3 dxc3(Better, though not promising was 7... Ba5 8. b4 Bb6 9. cxd4)

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Chess Board

Games / Brain Teasers /

You have a 5 x 5 chess board. You must place 5 queens so that you can place three pawns on the board and they will not be taken.

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Black to Play

Games / Chess Puzzles /

Richard Reti was famous for his endgame compositions. Here, over the board, he comes up with a plan worthy of a study against the great rook and pawn endgame grandmaster Akiba Rubinstein.

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Satellite Depression

Games / Brain Teasers /

What expression is represented below?

depressed 111111 satellite

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Movie Star

Games / Brain Teasers /

Name the famous movie star from the rebus below.

Srintn

Hint: Not all movie stars are human!

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Black to Play

Games / Chess Puzzles /

White’s sins in this game lie on a1, b1, f1, g1 and h1. Black punishes White for his transgressions by mating him in seven moves in Rhode v. VonZeitzewitz.

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Mathematical Rebus

Games / Brain Teasers /

What mathematical rule is represented by the rebus below?

.1km. = ~
.1cm. = ~
.1mm. = ____

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Joe and Smoe

Games / Brain Teasers /

Two friends, Joe and Smoe, were born in May, one in 1932, the other a year later. Each had an antique grandfather clock of which he was extremely proud. Both of the clocks worked fairly well considering their age, but one clock gained ten seconds per hour while the other one lost ten seconds per hour. On a day in January, the two friends set both clocks correctly at 12:00 noon. "Do you realize," asked Joe, "that the next time both of our clocks will show exactly the same time will be on your 47th birthday?" Smoe agreed. Who is older, Joe or Smoe?

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Christmas and New Year's

Games / Brain Teasers /

Everyone knows that both Christmas Day and New Year's Day always fall on the same day of the week. However, in 1939, the year of the outbreak of World War II, Christmas fell on a Monday and New Year's fell on a Sunday. Why?

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