Is 94,271,013 the sum of 12 consecutive integers?
By G.E. Rottigni. White to mate in two moves.
Here are seven new lateral thinking puzzles — play along with us as we try to untangle some perplexing situations using yes-or-no questions.
Lee Sallows just sent me this — the puzzle is difficult, but the solution is stunning:
What’s remarkable about this set of words?
BIOLOGY DEATHLY SLOSHED BASTARD SELVAGE FISSILE DALLIES FLAVORS
For which values of n can n points be placed on a sphere so that all of them are equidistant from each other?
Given 52 integers, prove that it’s always possible to find some two of them whose sum or difference is evenly divisible by 100.
From Louis Friedländer’s 1919 collection Chess Poetry. White to mate in two moves.
A remarkable thematic chess puzzle by Bodo Van Dehn, 1951. White to move and win.
The solution is 10 moves long, but all Black’s moves are forced. (That’s a very valuable hint.)
A flea sits on one vertex of a regular tetrahedron. He hops continually from one vertex to another, resting for a minute between hops and choosing vertices without bias. Prove that, counting the first hop, we’d expect him to return to his starting point after four hops.