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In the early part of the 1990’s there was a Windows game that I was playing on my father’s computer. I remember it quite fondly and recently found it in the Internet Archive. The game was Jewel Master by Peter Siamidis and it can be played online. I didn’t know it at the time, but it’s apparently a clone of a Sega game called Columns. Go figure. Even though I enjoyed it quite a lot I wasn’t quite good at it, and I’ve wondered what a good player would do. After my previous success with coded crosswords, I decided to give AI another go.

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A while back I wrote a parser for R6RS Scheme numbers, or the string->number procedure. Numbers in Scheme are somewhat sophisticated and can be written in some surprising variations and I wanted some test inputs for verifying that the parser doesn’t crash on valid inputs. Luckily, the number syntax is specified in such a way that a Prolog program easily can be written that generates test inputs.

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Recently while working on Zabavno the emulation was going wrong somewhere in a boot sector and I needed to check what it was actually supposed to be doing. This is pretty easy to do with QEMU as a remote target in gdb, but it can be tricky to get started.

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A certain type of crossword has been catching my attention ever since I was little. But it never interested me much to sit down and solve it on paper. What I wanted to do was to write a program that helps me solve it or, even better, one that finds the solution itself.

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