mscroggs.co.uk

mscroggs.co.uk

blog puzzles academic talks contact subscribe ↓ ☰ ↓

Comment

Comments

Comments in green were written by me. Comments in blue were not written by me.

2016-07-14

@stephan: It looks like the code I wrote to check the solutions were unique contained errors. This might explain why first question was very difficult to solve with logic alone.

Matthew
on /blog/24

×1

Archive

Show me a random blog post

2026

May 2026

World Cup stickers 2026

Apr 2026

A new puzzle every day
Mixing Wordle with other games

Feb 2026

Christmas (2025) is over

2025

Dec 2025

Christmas card 2025

Nov 2025

Christmas (2025) is coming!

Sep 2025

The partridge puzzle

Aug 2025

TMiP 2025 puzzle hunt

Jun 2025

A nonogram alphabet

Mar 2025

How to write a crossnumber

Jan 2025

Christmas (2024) is over
Friendly squares

2024

Dec 2024

A regular expression Christmas puzzle
Christmas card 2024

Nov 2024

Christmas (2024) is coming!

Feb 2024

Jan 2024

Christmas (2023) is over

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

Tags

squares edinburgh datasaurus dozen finite group weather station pi approximation day warwick stirling numbers dragon curves arrangement puzzles folding tube maps tetris kings sobolev spaces exponential growth reuleaux polygons curvature national lottery graphs programming weak imposition inverse matrices games propositional calculus javascript data mathsjam gather town london underground recursion pi reddit kenilworth final fantasy interpolation menace nonograms regular expressions game of life manchester science festival friendly squares determinants live stream the aperiodical electromagnetic field football captain scarlet gaussian elimination craft simultaneous equations fence posts video games game show probability golden spiral geogebra statistics martin gardner tennis preconditioning coins european cup raspberry pi advent calendar logo talking maths in public rugby books go dinosaurs logic signorini conditions noughts and crosses palindromes hyperbolic surfaces quadrilaterals accuracy misleading statistics alphabets polynomials asteroids arithmetic sorting binary ternary fractals world cup folding paper newcastle thirteen dates speed bots wool matrices estimation hannah fry platonic solids standard deviation rust anscombe's quartet chess boundary element methods golden ratio matrix of minors realhats chebyshev christmas card pizza cutting bempp php geometry sport correlation runge's phenomenon pascal's triangle trigonometry crossnumber python phd plastic ratio bubble bobble oeis countdown map projections bodmas news bluesky christmas flexagons radio 4 fonts data visualisation cross stitch ucl 24 hour maths draughts graph theory logs inline code hats matrix multiplication zines approximation databet pokémon youtube numerical analysis pythagoras probability rhombicuboctahedron turtles matrix of cofactors gerry anderson finite element method light nine men's morris crossnumbers guest posts wave scattering tmip partridge puzzle stickers error bars errors triangles mathslogicbot machine learning mean cambridge coventry crosswords sound royal baby dataset manchester people maths latex braiding convergence pac-man puzzles computational complexity royal institution london wordle big internet math-off pokémon wordle crochet matt parker numbers mathsteroids chalkdust magazine frobel hexapawn harriss spiral a gamut of games

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026