Challenging Brainteasers
by Bernardo Recaman Santos

Puzzle these out! Math and logic become more fun than ever when they're turned into brainteasing games. Some of these puzzles use cards or marbles; others have diagrams, grids and lively illustrations; still more present their questions as a story or riddle. Here are just two examples: Look at this sentence: Dale is wrong. Using all of these letters, can you spell a single word? Or, try Non-aligned Pawns: How must the 8 white and 8 black pawns in a chess set be placed on a board so that no three pawns end up in the same horizontal, vertical or diagonal line? These puzzles will really test your smarts!  Buy this book now!