2007 - Minor Confusion
Originally, I played Robert Abbott’s Confusion several times with Kerry Handscomb, where you don’t know which of your pieces can make which moves. We loved the idea of having to deduce your own pieces’ moves, but we were frustrated that a lot of the game came down to luck: who happened to find their most powerful pieces first.
We designed a version with fewer pieces that had more balanced power, and called it Minor Confusion. We even discussed the idea with Robert Abbott himself, and got his permission to include it in a book project that was never completed. Minor Confusion was OK, but a bit dry. We eventually moved on to playing other games.
Nov 2022 - Masquerade Chess
15 years after Minor Confusion, I had the idea to give pieces different moves when capturing. Standard chess pieces would move normally, except when they capture, and you have to deduce their capture moves. You have to engage with your opponent to learn anything, and that spreads the deduction over a longer game.
May 2023 - Zombie Chess
After several successful playtests, I started thinking about whether I could make a version of Masquerade Chess to sell. It seemed silly to try and sell the chess set, so I thought about making the accessories to add to a standard chess set: a dry-erase screen to secretly record which pieces have which capture moves.
It seemed like it would be easier to sell, if you could play more than one game with it, so I tried to think of other chess variants with hidden information that could use a dry-erase screen. I had the idea to secretly bury the captured pieces on the board, and Zombie Chess was born.
Jun 2023 - Chess Kit
After two successful ideas, I decided to turn them into another book project, similar to Donimoes, my collection of new domino games and puzzles. I came up with eight ideas over a couple of weeks.
Oct 2023 - Cooperative Chess
I had a successful playtest of Crowded House, and wrote up its rules, along with Chess960. I spent the most time, though, testing Cooperative Chess as a solitaire.
I also converted the scripts for publishing the Donimoes rules as PDF and website to this project.
Nov 2023 - Adrenaline Chess
Started with Manna Chess, where manna drops randomly after each capture, and gives the piece carrying it one extra king move. Players found the random drops annoying, so we switched to Adrenaline Chess, where you choose which opposing piece to give an adrenaline boost to after each capture. Made for some interesting tactics of giving the boost to a piece you could capture it back from.
Dec 2023 - Chess Golf
Started with Neighbour Chess Solitaire, where the pieces borrow their neighbour’s move, and then merged it with Ricochet Robots to make Chess Golf. Struggled with the mechanics of automatically adding pieces back to the board and what to do when a colour has no neighbouring pairs. Fixed it by adding special moves that can be done any time, but are expensive, then decided to add pieces back between rounds, and make a king’s move when there are no neighbouring pairs of a colour.
Breadth-first search could only handle the easy problems, so investigated Monte Carlo tree search.
Feb 2024 - Chess Cards
Playtesters consistently complained about having to map regular playing cards
to chess pieces, so I designed a deck of chess cards. The fronts were easy, I
just used the chess symbols from the python-chess library, and added pips for
the gaps used in Chess Golf and Parade Chess Solitaire.
The backs, though, went through several ideas. My main idea was to have a checkerboard pattern with some kind of distortion. I thought that twisting the pattern more and more as it approached the edge would make the card edge tolerant to drift when the cards are printed and cut out, and I also made the black and white both fade to grey. I didn’t really like the plain corners, and I noticed that most card back patterns have a solid border with a plain white bleed, so I switched to that, and moved the twist to the middle of the pattern.
The twist itself used some interesting math. I chose a sigmoid curve that I came across while studying machine learning. Here’s how the checkerboard pattern is rotated as you move away from the centre of the image. That gives you a stable region in the centre, a rotation phase, and then another stable region at the edges. To me, it looks like someone grabbed the centre and twisted it.
