Greaterdoku (in General) Rating: 4.83 Posted on 2007-07-15 by Federico Kereki (No Solution Yet, 12 Comments)
Know yourself (in Liars and Knights) Rating: 4.00 Posted on 2007-07-06 by Federico Kereki (No Solution Yet, 12 Comments)
A grok is a grok is a ... ? (in Liars and Knights) Rating: 3.00 Posted on 2007-06-29 by Federico Kereki (No Solution Yet, 11 Comments)
All Wrong at the Olympic Games (in Logic) Rating: 4.25 Posted on 2007-06-15 by Federico Kereki (Solution Posted, 14 Comments)
Triple Convergence (in Algorithms) Rating: 4.00 Posted on 2007-06-08 by Federico Kereki (No Solution Yet, 1 Comments)
Some Hardy Ramanujan variants (in Numbers) Rating: 3.00 Posted on 2007-06-02 by Federico Kereki (No Solution Yet, 2 Comments)
Only one, one, one (in Calculus) Rating: 4.50 Posted on 2007-05-30 by Federico Kereki (Solution Posted, 5 Comments)
An apple (or more) a day... (in Numbers) Rating: 4.00 Posted on 2007-05-28 by Federico Kereki (No Solution Yet, 2 Comments)
How to pick 'em (in Logic) Rating: 4.50 Posted on 2007-05-25 by Federico Kereki (Solution Posted, 8 Comments)
Always greater (in Games) Rating: 3.50 Posted on 2007-04-14 by Federico Kereki (Solution Posted, 6 Comments)
Is it, or is it not? (in Numbers) Rating: 3.67 Posted on 2007-04-10 by Federico Kereki (Solution Posted, 13 Comments)
Close to Fermat (in Numbers) Rating: 5.00 Posted on 2007-04-06 by Federico Kereki (Solution Posted, 4 Comments)
Paint it black (in Probability) Posted on 2007-04-02 by Federico Kereki (Solution Posted, 9 Comments)
For the forty-something-ers (in Riddles) Rating: 3.40 Posted on 2007-01-10 by Federico Kereki (Solution Posted, 4 Comments)
Red herrings (in Cryptography) Rating: 4.20 Posted on 2006-12-19 by Federico Kereki (Solution Posted, 7 Comments)
Horoscope Hijinks II (in General) Rating: 4.00 Posted on 2006-12-05 by Federico Kereki (Solution Posted, 4 Comments)
Horoscope Hijinks I (in General) Rating: 3.00 Posted on 2006-11-28 by Federico Kereki (Solution Posted, 9 Comments)
A square with a circle with a point (in Geometry) Rating: 3.33 Posted on 2006-11-25 by Federico Kereki (Solution Posted, 15 Comments)
Where to? (in Word Problems) Rating: 3.33 Posted on 2006-11-02 by Federico Kereki (Solution Posted, 3 Comments)
Three Periodical Questions (in Numbers) Rating: 3.00 Posted on 2006-10-16 by Federico Kereki (Solution Posted, 4 Comments)
Eight Gates (in Games) Rating: 4.33 Posted on 2006-09-29 by Federico Kereki (Solution Posted, 4 Comments)
Needed: a large calculator! (in Numbers) Rating: 2.75 Posted on 2006-09-22 by Federico Kereki (Solution Posted, 7 Comments)
Take five! (in Numbers) Rating: 4.00 Posted on 2006-09-21 by Federico Kereki (Solution Posted, 4 Comments)
As simple as it gets (in Liars and Knights) Rating: 4.50 Posted on 2006-09-02 by Federico Kereki (Solution Posted, 6 Comments)
Identical Opposites (in Word Problems) Rating: 4.50 Posted on 2006-08-29 by Federico Kereki (Solution Posted, 5 Comments)
Play fair in Europe! (in Cryptography) Rating: 4.22 Posted on 2006-06-29 by Federico Kereki (Solution Posted, 13 Comments)
Cherry picking (in Probability) Rating: 4.75 Posted on 2006-06-17 by Federico Kereki (Solution Posted, 4 Comments)
Look Ma, no integrals! (in Calculus) Rating: 3.75 Posted on 2006-05-02 by Federico Kereki (Solution Posted, 14 Comments)
Wreck out! (in Algorithms) Rating: 4.14 Posted on 2006-04-03 by Federico Kereki (Solution Posted, 6 Comments)
Three in a Row (in Word Problems) Rating: 3.00 Posted on 2006-02-09 by Federico Kereki (Solution Posted, 11 Comments)
Tug of War (in General) Rating: 1.67 Posted on 2006-01-27 by Federico Kereki (Solution Posted, 12 Comments)
Add a third (in Word Problems) Rating: 3.67 Posted on 2005-12-02 by Federico Kereki (Solution Posted, 24 Comments)
Complete the pair (in Sequences) Rating: 3.67 Posted on 2005-11-29 by Federico Kereki (Solution Posted, 6 Comments)
Boneheaded Bookie (in Probability) Rating: 4.00 Posted on 2005-11-26 by Federico Kereki (Solution Posted, 8 Comments)
Find just one digit (in Numbers) Rating: 4.00 Posted on 2005-11-10 by Federico Kereki (Solution Posted, 13 Comments)
A greek guilt (in Liars and Knights) Rating: 4.00 Posted on 2005-09-04 by Federico Kereki (Solution Posted, 11 Comments)
A quite even partition (in Numbers) Rating: 4.33 Posted on 2005-08-28 by Federico Kereki (Solution Posted, 18 Comments)
All/Any different? (in Numbers) Rating: 3.50 Posted on 2005-08-16 by Federico Kereki (Solution Posted, 27 Comments)
Trigonometry nest (in Calculus) Rating: 3.83 Posted on 2005-08-12 by Federico Kereki (Solution Posted, 11 Comments)
Three couples, one problem (in Logic) Rating: 3.85 Posted on 2005-07-25 by Federico Kereki (Solution Posted, 23 Comments)
Any order will do (in Numbers) Rating: 3.67 Posted on 2005-07-12 by Federico Kereki (Solution Posted, 8 Comments)
Three of Hanoi (in Algorithms) Rating: 4.50 Posted on 2005-07-01 by Federico Kereki (Solution Posted, 3 Comments)
Squaring sides (in Geometry) Rating: 4.00 Posted on 2005-05-04 by Federico Kereki (Solution Posted, 4 Comments)
Just find two! (in Geometry) Rating: 4.33 Posted on 2005-04-27 by Federico Kereki (Solution Posted, 25 Comments)
Guess a number (in Algorithms) Rating: 4.33 Posted on 2005-04-14 by Federico Kereki (Solution Posted, 19 Comments)
Counting Sand (in Algorithms) Rating: 3.33 Posted on 2005-04-07 by Federico Kereki (Solution Posted, 9 Comments)
Intuitive Coins (in Algorithms) Rating: 3.80 Posted on 2005-03-29 by Federico Kereki (Solution Posted, 14 Comments)
Two false coins (in Weights and Scales) Posted on 2005-03-25 by Federico Kereki (Solution Posted, 11 Comments)
Cosines everywhere (in Geometry) Rating: 4.50 Posted on 2005-03-21 by Federico Kereki (Solution Posted, 6 Comments)
Make it go! (in Science) Rating: 4.50 Posted on 2005-03-18 by Federico Kereki (Solution Posted, 18 Comments)
Knight vs King and Mines (in Games) Rating: 4.00 Posted on 2005-03-07 by Federico Kereki (Solution Posted, 15 Comments)
Boring, boring... (in Geometry) Rating: 4.38 Posted on 2005-03-06 by Federico Kereki (Solution Posted, 13 Comments)
Four four-letter words! (in Word Problems) Rating: 4.00 Posted on 2005-02-27 by Federico Kereki (Solution Posted, 6 Comments)
Opposite synonyms (in Word Problems) Rating: 3.50 Posted on 2005-01-28 by Federico Kereki (Solution Posted, 9 Comments)
A rainbow of haves and have-nots (in Word Problems) Rating: 4.13 Posted on 2005-01-26 by Federico Kereki (Solution Posted, 15 Comments)
All integers (in Geometry) Rating: 4.50 Posted on 2005-01-17 by Federico Kereki (Solution Posted, 14 Comments)
Playing Lotto (in Probability) Rating: 4.00 Posted on 2005-01-14 by Federico Kereki (Solution Posted, 14 Comments)
Two circles (in Geometry) Rating: 3.25 Posted on 2004-10-21 by Federico Kereki (No Solution Yet, 11 Comments)
Sequencing problems (in Numbers) Rating: 3.17 Posted on 2004-10-01 by Federico Kereki (Solution Posted, 10 Comments)
3x5 = 5x3 (in Shapes) Rating: 3.08 Posted on 2004-09-30 by Federico Kereki (Solution Posted, 5 Comments)
72 degrees (in Weights and Scales) Rating: 4.00 Posted on 2004-09-29 by Federico Kereki (Solution Posted, 10 Comments)
At the Olympic Games (6) (in Logic) Rating: 2.69 Posted on 2004-09-27 by Federico Kereki (Solution Posted, 48 Comments)
Get one half by squaring (in Just Math) Rating: 4.25 Posted on 2004-09-20 by Federico Kereki (Solution Posted, 32 Comments)
A pool rack filled with balls (in Geometry) Rating: 3.36 Posted on 2004-09-17 by Federico Kereki (Solution Posted, 25 Comments)
Noughts and Crosses (in Games) Rating: 3.20 Posted on 2004-09-16 by Federico Kereki (Solution Posted, 7 Comments)
Mix 'em up! (in Word Problems) Rating: 2.33 Posted on 2004-09-15 by Federico Kereki (Solution Posted, 11 Comments)
Rectangle in lights (in General) Rating: 3.00 Posted on 2004-09-14 by Federico Kereki (Solution Posted, 4 Comments)
Hawks and Doves (in Probability) Rating: 3.50 Posted on 2004-09-13 by Federico Kereki (Solution Posted, 22 Comments)
Harder Russian Roulette (in Probability) Rating: 3.43 Posted on 2004-09-11 by Federico Kereki (Solution Posted, 21 Comments)
Another last digit (in Numbers) Rating: 2.50 Posted on 2004-09-07 by Federico Kereki (Solution Posted, 10 Comments)
Four-letter insert? (in Word Problems) Rating: 2.50 Posted on 2004-09-06 by Federico Kereki (Solution Posted, 11 Comments)
Missing digits (in Just Math) Rating: 2.29 Posted on 2004-09-04 by Federico Kereki (Solution Posted, 9 Comments)
Moo-ing along (in General) Rating: 2.00 Posted on 2004-09-03 by Federico Kereki (Solution Posted, 9 Comments)
Ages (in General) Rating: 3.00 Posted on 2004-08-31 by Federico Kereki (Solution Posted, 10 Comments)
At the Olympic Games (5) (in Logic) Rating: 2.60 Posted on 2004-08-30 by Federico Kereki (Solution Posted, 21 Comments)
Cubeless? (in Just Math) Rating: 3.40 Posted on 2004-08-29 by Federico Kereki (Solution Posted, 7 Comments)
No zeroes allowed (in Numbers) Rating: 3.50 Posted on 2004-08-27 by Federico Kereki (Solution Posted, 4 Comments)
8 = 4 + 4 (in Numbers) Rating: 3.00 Posted on 2004-08-26 by Federico Kereki (Solution Posted, 12 Comments)
Nice sum (in Just Math) Rating: 3.00 Posted on 2004-08-24 by Federico Kereki (Solution Posted, 13 Comments)
Provably unprovable? (in Paradoxes) Rating: 3.42 Posted on 2004-08-22 by Federico Kereki (Solution Posted, 36 Comments)
A circle through seven points (in Geometry) Rating: 2.50 Posted on 2004-08-19 by Federico Kereki (Solution Posted, 2 Comments)
Summing inverses (in Calculus) Rating: 4.00 Posted on 2004-08-19 by Federico Kereki (Solution Posted, 18 Comments)
Factorials everywhere (in Just Math) Rating: 3.00 Posted on 2004-08-16 by Federico Kereki (Solution Posted, 7 Comments)
Sides inequality (in Geometry) Rating: 2.50 Posted on 2004-08-13 by Federico Kereki (Solution Posted, 1 Comments)
Sum of two powers (in Just Math) Rating: 4.40 Posted on 2004-08-12 by Federico Kereki (Solution Posted, 7 Comments)
Inverted powers (in Calculus) Rating: 4.00 Posted on 2004-08-10 by Federico Kereki (Solution Posted, 2 Comments)
Waiting, waiting... (in Probability) Rating: 3.29 Posted on 2004-08-07 by Federico Kereki (Solution Posted, 19 Comments)
No colors known? (in Games) Rating: 3.14 Posted on 2004-08-04 by Federico Kereki (Solution Posted, 17 Comments)
Prime clock (in General) Rating: 3.75 Posted on 2004-08-01 by Federico Kereki (Solution Posted, 16 Comments)
Round the square (in Numbers) Rating: 3.00 Posted on 2004-07-30 by Federico Kereki (Solution Posted, 5 Comments)
Maximum sum (in Probability) Rating: 3.83 Posted on 2004-07-29 by Federico Kereki (Solution Posted, 10 Comments)
Just by hand, only by hand, nothing but by hand? (in Algorithms) Rating: 4.17 Posted on 2004-07-26 by Federico Kereki (Solution Posted, 7 Comments)
Before and After (in Sequences) Rating: 4.50 Posted on 2004-07-23 by Federico Kereki (Solution Posted, 4 Comments)
At the Olympic Games (4) (in Logic) Rating: 3.14 Posted on 2004-07-21 by Federico Kereki (Solution Posted, 10 Comments)
Fill in (in Just Math) Rating: 2.71 Posted on 2004-07-20 by Federico Kereki (Solution Posted, 8 Comments)
Who plays next? (in Games) Rating: 2.86 Posted on 2004-07-19 by Federico Kereki (Solution Posted, 15 Comments)
Fibonacci sums (in Just Math) Rating: 3.71 Posted on 2004-07-15 by Federico Kereki (Solution Posted, 13 Comments)
Break a dollar (in Numbers) Rating: 3.25 Posted on 2004-07-14 by Federico Kereki (Solution Posted, 8 Comments)
123456789 equals 100 (in Numbers) Rating: 3.00 Posted on 2004-07-10 by Federico Kereki (Solution Posted, 8 Comments)
Who wins? (in Probability) Rating: 4.00 Posted on 2004-07-08 by Federico Kereki (Solution Posted, 10 Comments)
101 - 102 (in General) Rating: 3.57 Posted on 2004-07-06 by Federico Kereki (Solution Posted, 19 Comments)
How often does he lie? (in Probability) Rating: 2.50 Posted on 2004-07-02 by Federico Kereki (Solution Posted, 8 Comments)
Summing powers (in Just Math) Rating: 3.00 Posted on 2004-07-01 by Federico Kereki (Solution Posted, 18 Comments)
Subsetting a set (in Numbers) Rating: 3.80 Posted on 2004-06-29 by Federico Kereki (Solution Posted, 9 Comments)
Multiplying gets a square? (in Just Math) Rating: 3.00 Posted on 2004-06-26 by Federico Kereki (Solution Posted, 25 Comments)
Magic-in-more-than-one-way Square (in Numbers) Rating: 3.33 Posted on 2004-06-24 by Federico Kereki (Solution Posted, 12 Comments)
More or less magic square (in General) Rating: 3.25 Posted on 2004-06-22 by Federico Kereki (Solution Posted, 11 Comments)
Short equation (in Numbers) Rating: 2.75 Posted on 2004-06-17 by Federico Kereki (Solution Posted, 14 Comments)
Fibonaccian nines (in Just Math) Rating: 4.33 Posted on 2004-06-15 by Federico Kereki (Solution Posted, 10 Comments)
Coin tossing (in Probability) Rating: 3.67 Posted on 2004-06-11 by Federico Kereki (Solution Posted, 26 Comments)
A kiss is just a kiss... (in Numbers) Rating: 3.33 Posted on 2004-06-09 by Federico Kereki (Solution Posted, 4 Comments)
Double C, double T (in Word Problems) Rating: 2.50 Posted on 2004-06-07 by Federico Kereki (Solution Posted, 10 Comments)
Yet one more coin sorting problem (in Weights and Scales) Rating: 4.00 Posted on 2004-05-31 by Federico Kereki (Solution Posted, 20 Comments)
Symmetrical words (in Word Problems) Rating: 3.50 Posted on 2004-05-21 by Federico Kereki (Solution Posted, 18 Comments)
Powers of powers (in Calculus) Rating: 4.10 Posted on 2004-05-11 by Federico Kereki (Solution Posted, 13 Comments)
A dozen Knights (in Shapes) Rating: 3.00 Posted on 2004-05-05 by Federico Kereki (Solution Posted, 5 Comments)
Strange pyramid (in Geometry) Rating: 3.00 Posted on 2004-05-03 by Federico Kereki (Solution Posted, 10 Comments)
Never prime! (in Numbers) Rating: 3.83 Posted on 2004-04-29 by Federico Kereki (Solution Posted, 12 Comments)
Pythagorean Pyramid (in Geometry) Rating: 4.13 Posted on 2004-04-26 by Federico Kereki (Solution Posted, 15 Comments)
I'm a dot in place (in Word Problems) Rating: 3.57 Posted on 2004-04-23 by Federico Kereki (Solution Posted, 13 Comments)
Summing (in Just Math) Rating: 3.80 Posted on 2004-04-16 by Federico Kereki (Solution Posted, 5 Comments)
A flat ball? (in Geometry) Rating: 3.75 Posted on 2004-04-08 by Federico Kereki (Solution Posted, 25 Comments)
At the World Series (in Probability) Rating: 3.20 Posted on 2004-04-01 by Federico Kereki (Solution Posted, 7 Comments)
A point in a square (in Geometry) Rating: 3.13 Posted on 2004-03-17 by Federico Kereki (Solution Posted, 7 Comments)
Diagonal triangle sums (in Just Math) Rating: 3.86 Posted on 2004-03-15 by Federico Kereki (Solution Posted, 4 Comments)
Spirit of '76 (in Just Math) Rating: 4.25 Posted on 2004-03-14 by Federico Kereki (Solution Posted, 8 Comments)
Murder by Logic (in Logic) Rating: 3.77 Posted on 2004-03-05 by Federico Kereki (Solution Posted, 23 Comments)
At the "Oilympic" Games (in Logic) Rating: 3.75 Posted on 2004-03-01 by Federico Kereki (Solution Posted, 17 Comments)
The not-always-lying politician (in General) Rating: 4.00 Posted on 2004-02-27 by Federico Kereki (Solution Posted, 20 Comments)
The Pregnant Secretary (in Algorithms) Rating: 4.00 Posted on 2004-02-21 by Federico Kereki (Solution Posted, 28 Comments)
Three threes, or two twos? (in Just Math) Rating: 4.17 Posted on 2003-12-09 by Federico Kereki (Solution Posted, 4 Comments)
At the Olympic Games (3) (in Logic) Rating: 3.21 Posted on 2003-10-13 by Federico Kereki (Solution Posted, 15 Comments)
At the Olympic Games (2) (in Logic) Rating: 3.00 Posted on 2003-10-09 by Federico Kereki (Solution Posted, 8 Comments)
At the Olympic Games (1) (in Logic) Rating: 3.20 Posted on 2003-10-07 by Federico Kereki (Solution Posted, 21 Comments)
A Logic Accusation (in Logic) Rating: 2.87 Posted on 2003-10-01 by Federico Kereki (Solution Posted, 17 Comments)
Cut chessboard (in Shapes) Rating: 4.00 Posted on 2003-09-26 by Federico Kereki (Solution Posted, 7 Comments)
