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

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026