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pretorik |
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markr |
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116 |
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Gordon Weir |
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104 |
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mbloomfi |
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97 |
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Dennis Nazarov |
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96 |
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zzz123 |
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72 |
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Srikanta |
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56 |
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lidSpelunker |
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53 |
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SAMIH FAHMY |
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48 |
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jkr |
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44 |
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denisR, mishik |
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236 |
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alan, De_Bill |
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dddfff |
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228 |
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kavfy |
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221 |
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idler_ |
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106 |
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akajobe |
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94 |
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tolstyi |
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56 |
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STARuK |
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42 |
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vale |
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31 |
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xandr |
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11 |
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One more opening |
Chess puzzles |
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Weight: 3 |
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Liked the puzzle: 100% |
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24.12.2011 |
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Starting from the initial possition White and Black have done 4 moves each. What are these moves? Picture. |
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Puzzle statistics "One more opening".
Last updated minutes ago.
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Solved by:
Daily average:
Answers submitted:
Viewed by:
Fraction solved by: %
Solved at first attempt: %
Average discussion length:
Liked the puzzle:
Did not like the puzzle:
0
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A Megamind in a boat |
Geometry puzzles |
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Weight: 4 |
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Liked the puzzle: 100% |
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27.12.2009 |
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A Megamind is sitting in a boat at the center of a circular lake of
radius R. On the lake shore, an evil Goblin awaits. Luckily for the
Megamind, the Goblin can only move along the shore. Unfortunately, the
Goblin is 4 times as fast as the Megamind in his boat. The Megamind
can save himself if he gets to the shore and evades meeting with the
Goblin. Can the Megamind save himself? If yes - how? |
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Puzzle statistics "A Megamind in a boat".
Last updated 6910155.2 minutes ago.
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Solved by: 10
Daily average: 0
Answers submitted: 18
Viewed by: 296
Fraction solved by: 3.3%
Solved at first attempt: 90%
Average discussion length: 1.2
Liked the puzzle: 4
Did not like the puzzle:
0
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What is the minimal number of straight cuts required to split a 3x3x3
cube into 27 1x1x1 cubes? Pieces can be rearranged arbitrarily between
the cuts. The answer should justify the minimality. |
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Puzzle statistics "Cutting the cube".
Last updated 6910155.2 minutes ago.
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Solved by: 19
Daily average: 0
Answers submitted: 22
Viewed by: 296
Fraction solved by: 6.4%
Solved at first attempt: 89.4%
Average discussion length: 1.3
Liked the puzzle: 4
Did not like the puzzle:
1
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The mouse hunt |
Games puzzles |
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Weight: 4 |
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Liked the puzzle: 100% |
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11.01.2010 |
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A smart cat named Leopold is hunting a mouse. A mouse is hiding in one
of five holes arranged in a row. Leopold can reach into one of the
holes and try to catch the mouse. If he is not successful, the scared
mouse runs into a right/left neighboring hole. Is it guaranteed that
Leopold will catch the mouse? If so, what should he do? |
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Puzzle statistics "The mouse hunt".
Last updated 6910155.2 minutes ago.
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Solved by: 11
Daily average: 0
Answers submitted: 18
Viewed by: 290
Fraction solved by: 3.7%
Solved at first attempt: 54.5%
Average discussion length: 2.2
Liked the puzzle: 5
Did not like the puzzle:
0
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After a shipwreck, a MegaMind found himself on an island where some natives always lie and some always tell the truth. As a ritual, all natives stood in a circle facing the center, joined their hands and everybody told the MegaMind whether his right hand side neighbor is a liar or a truth-teller. Based on this information, the MegaMind was able to determine the exact percentage of natives that tell the truth.
Can you also determine this percentage? |
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Puzzle statistics "A circle of lies".
Last updated 6910155.2 minutes ago.
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Solved by: 9
Daily average: 0
Answers submitted: 10
Viewed by: 284
Fraction solved by: 3.1%
Solved at first attempt: 77.7%
Average discussion length: 1.8
Liked the puzzle: 2
Did not like the puzzle:
0
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1. Continue the sequence a, aa, ba, abaa, aaabba, cabbaa, ...
2. Could symbol "d" eventually appear in this sequence? |
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Puzzle statistics "A sequence".
Last updated 6910155.2 minutes ago.
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Solved by: 14
Daily average: 0
Answers submitted: 16
Viewed by: 273
Fraction solved by: 5.1%
Solved at first attempt: 78.5%
Average discussion length: 1.4
Liked the puzzle: 2
Did not like the puzzle:
0
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A Megamind has 12 coins, one of which is counterfeit and weighs
differently from the others. He has a balance scale, but no weights.
How can the Megamind find the counterfeit coin and determine whether
it is lighter or heavier than the standard ones? What is the minimal
number of weighings required? |
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Puzzle statistics "12 coins".
Last updated 6910155.2 minutes ago.
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Solved by: 10
Daily average: 0
Answers submitted: 10
Viewed by: 273
Fraction solved by: 3.6%
Solved at first attempt: 80%
Average discussion length: 1.4
Liked the puzzle: 4
Did not like the puzzle:
0
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Six matches and triangles 2 |
Geometry puzzles |
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Weight: 4 |
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Liked the puzzle: 100% |
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07.02.2010 |
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How to make one equilateral and three isosceles (and not equilateral!) triangles using 6 sticks of the same length? Sticks cannot be broken and/or laid over each other and no free ends of the matches may be left. |
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Puzzle statistics "Six matches and triangles 2".
Last updated 6910155.2 minutes ago.
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Solved by: 5
Daily average: 0
Answers submitted: 15
Viewed by: 273
Fraction solved by: 1.8%
Solved at first attempt: 40%
Average discussion length: 2.2
Liked the puzzle: 3
Did not like the puzzle:
0
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Tic-tac-toe, the Megamind style |
Games puzzles |
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Weight: 4 |
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Liked the puzzle: 100% |
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26.02.2011 |
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Two Megaminds decided to play tic-tac-toe using new rules. They use a
regular 3x3 playing pad, but each player can choose to
place either an X or an O into one of the cells. The winner is still
the one who arranges three X's or three O's in a line. Is there a
winning strategy in this game? Which player has it? |
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Puzzle statistics "Tic-tac-toe, the Megamind style".
Last updated 6910155.2 minutes ago.
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Solved by: 7
Daily average: 0
Answers submitted: 8
Viewed by: 56
Fraction solved by: 12.5%
Solved at first attempt: 71.4%
Average discussion length: 1.4
Liked the puzzle: 2
Did not like the puzzle:
0
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A game with coins |
Games puzzles |
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Weight: 4 |
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Liked the puzzle: 100% |
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12.03.2011 |
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Two Megaminds play a game: they have a regular round table and an unlimited
supply of identical round coins. Turn by turn, they place coins on the
table until someone can no longer make a move. The coins cannot
overlay each other, but they can touch. Who has a winning strategy
(and what is it) in this game? |
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Puzzle statistics "A game with coins".
Last updated 6910155.2 minutes ago.
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Solved by: 6
Daily average: 0
Answers submitted: 7
Viewed by: 38
Fraction solved by: 15.7%
Solved at first attempt: 83.3%
Average discussion length: 1.3
Liked the puzzle: 1
Did not like the puzzle:
0
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