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In a waiting room this week I opened a newspaper to find the following puzzle, named “Suko” (a trademark of Puzzler). Various approaches exist to solving them manually and it’s possible to play online. However they are an excellent candidate for an SMT solver so I decided to implement one using pysmt. The puzzle The idea behind Suko is simple (manually solving is not!). In the puzzle above the following requirements must be met:


During the recent site cleanup I decided to disable comments and remove (most) previous comments from the site. This post explains my reasoning.


I’ve given this site a long overdue tidy, finally moving away from Wordpress to a static site.


This post is entirely based on my opinions. If you don’t want to read a post about my opinions there are plenty of excellent videos on YouTube. You have been warned.


Banks and financial institutions are constantly giving out advice about email safety, helping customers to avoid phishing scams. Make sure the email is genuine, don’t click on links, never give your personal information away online. Sensible advice, unless the financial institution doesn’t make it easy to actually verify their emails.



Kart Timing Mk1

A basic kart timing system, built from scratch

PCB0001 - 18F breakout

A PIC 18F breakout board, suitable for prototyping

PCB0003 - Breadboard supply

A 5v / 3.3v breadboard power supply circuit

PCB0006 - RFM12 breakout

A breakout for the popular RFM12 radio module

PCB0002 - LED matrix

A simple 8x8 LED matrix, with a cute ghost :)

Eagle library

Some useful components for Cadsoft Eagle

GNU Screen Config

A tabbed setup for screen (archived content)

Nautical signal flags

Free flags for use in projects (SVG / PNG / ICO formats available)

VB6 RichTextBox control

Extending VB6 controls with the Win32 API (archived content)

VB6 reverse DNS

Obtaining PTR records using Visual Basic 6 (archived content)

MOTD maker

Easily create coloured MOTD messages (archived content)

ROT Util

The Caesar cipher in a simple Windows GUI (archived content)