Henry Ernest Dudeney/Puzzles and Curious Problems/255 - A Peg Puzzle/Solution

Puzzles and Curious Problems by Henry Ernest Dudeney: $255$

A Peg Puzzle

The diagram represents a square board with $49$ holes in it.

There are $10$ pegs to be placed in the positions shown,

and the puzzle is to remove only $3$ of these pegs to different holes,

so that the ten shall form $5$ rows with $4$ pegs in every row.

Which three would you move, and where would you place them?

Solution

The crosses indicate where the pegs were moved from.

Also see

• $257$ - Five Lines of Four in this collection, practically the same puzzle as this one.
• $258$ - Deploying Battleships in this collection, another similar take.

Sources

• 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Solutions: $255$. -- A Peg Puzzle
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $438$. A Peg Puzzle