Jaap Scherphuis

Netherlands

https://www.jaapsch.net

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An unusual and very hard number sequence problem

mathematics number-sequence asked Jul 29 '16 at 9:50

puzzling.stackexchange.com

21 votes

Four points with only two distances

mathematics geometry asked Mar 30 '18 at 22:21

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18 votes

A strange computer programming language

mathematics computer-science asked Dec 28 '18 at 8:14

puzzling.stackexchange.com

14 votes

Waiting for the gravy at a dinner table

mathematics asked Mar 4 at 19:13

puzzling.stackexchange.com

11 votes

Ziggy - Make a square from 8 polyomino pieces

no-computers polyomino packing asked Jun 23 '18 at 20:28

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8 votes

Walk a Crooked Path

optimization checkerboard asked Jun 18 at 21:08

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8 votes

Inside Out and Back to Front

three-dimensional asked Jul 20 at 5:00

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7 votes

Building a pyramid from di-spheres

geometry combinatorics asked Mar 27 '17 at 8:56

puzzling.stackexchange.com

6 votes

Hopping Frogs puzzle variant

strategy board-games asked Dec 29 '16 at 8:33

puzzling.stackexchange.com

Top Answers

Swapping rooks in a 4x4 board

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A clock correct three times a day

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The No-Straight Maze

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Asking uncle's help to divide goats

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How can one solve a Rubik's cube without relying on guides/algorithms?

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Why will my friend have to grow his beard out?

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How few disks are needed to cover a square efficiently?

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In how many different ways can a 9-panel comic grid be used?

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What's the maximum number of pegs you can leave on a 15-hole triangular peg solitaire?

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Diagonals in a 5x5 Grid

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A fancy man talking nonsense

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Film plots explained badly

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Can all arbuzoids assume the same color?

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Twisted TV Titles, season 2

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Cutting a cross made of 5 equal squares by 2 straight cut into 4 figure to together form a square

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Long digital sequence. 16xxxxxxxxxxxxx61

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Doomsday will occur in the year with a triple blue moon

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Measuring Water with a Holey Cube

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Ages of mathematician's five children

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General strategies for solving metal disentanglement puzzles

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Piece of Cake for King Solomon

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Is there a configuration of the 8-puzzle where locking a tile makes it harder?

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The Rectangle Puzzle

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25 square puzzle

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8-queen puzzle on its head

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Martin Gardner's “The Twiddled Bolts”

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Spider and fly on a cube

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The Longest Chess Game

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Coin removal problem

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How do I solve the top yellow layer of the Rubik's cube?

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Jaap Scherphuis

An unusual and very hard number sequence problem

Four points with only two distances

A strange computer programming language

Waiting for the gravy at a dinner table

Ziggy - Make a square from 8 polyomino pieces

Walk a Crooked Path

Inside Out and Back to Front

Building a pyramid from di-spheres

Hopping Frogs puzzle variant