New posts in Puzzle

Two trains move towards each other, a bird moves between them. How many trips can the bird make?

Proof for "coin sharing" game

Need help figure out a Fibonacci related math trick

Train from Nagpur to Raipur

Proving all variables are equal

Black and white shirts puzzle

Partition of a rectangle into squares problem

Solve Riddle With Algebra

Is there a general effective method to solve Smullyan style Knights and Knaves problems? Is the truth table method the most appropriate one?

Prove there exists $2\times 2$ checkerboard-colored square in a $100\times 100$ table colored black and white.