Too Nice To Die, the beginning YouTube video by David Joyner

Too Nice To Die, the beginning
youtu.be/hlbIg_Smt8Q

Lucy meets Lenny, revisited YouTube video by David Joyner

a revised "Lucy meets Lenny" video, with their dog Ramis:
youtu.be/DdluihTgraY

Mayor Nona Sonnof vs the AI Governor of Venus YouTube video by David Joyner

Here's a new video I made:
youtu.be/xZHVSWl8Wco
See github.com/wdjoyner/pam for more details.
Hope you enjoy:-)

Another harmonic morphism animation YouTube video by David Joyner

Here is a harmonic morphism animation (Example 159 from an upcoming book with Caroline Melles, Exploring Graphs with Harmonic Morphisms):

Introducing CGA: A Chess Game Analyzer CGA is a Python-based module for chess study

I've been working on some chess analysis software using stockfish and python. Here an announcement: lichess.org/@/wdj/blog/i...

Funny Numbers

:-)
xkcd.com/3184/

The Elevator Problem (4/4)
Taboo: You can press the elevator button if and only if no elevator is moving down.
Is there a finite sequence of moves that allows you to ride in elevator e?

The Elevator Problem (3/4)
Goal: Suppose you want to use elevator e (for some fixed e=1, 2, ..., n).
Move: If you press the button and an elevator other than elevator e arrives, you can tell it to go to any floor you wish.

The Elevator Problem (2/3)
The way the elevator logic works is this: when you press the elevator button, the one closest to you (= one on floor number min(fk, k>0)) is told to go to 0. If there is a tie then, of those on the same lowest floor, the elevator with the smallest index is told to go to 0.

The Elevator Problem (1/3)
You are on the bottom floor (floor 0, lets call it) of an apartment building with no basement. There are n elevators, which we index 1,2,...,n. Assume the elevators are initially on floors f1, f2, ... , where fk>0 is the floor elevator k is currently on, 1<=k<=n.

work in progress: rithmomachia in godot I’ve already written a few implementations of rithmomachia is python (see the github site for more). Since gdscript (the language used by game developing package godot) is similar to Python, …

working on a board game in godot:
yetanothermathblog.com/rithmomachia...

The mathematician and the Pope Acknowledgement: This could not have been written without the helpful conversations and correspondences with these brilliant scholars: Edray Goins (Pomoma), John Stigall (Howard), Nathan Alexander …

yetanothermathblog.com/2025/08/21/t...

setting up rithmomachia pieces using patterns This is a rithmomachia lesson on the ingenious patterns that the values make between the pieces when they are in their initial position, usi...

the latest rithmomachia tutorial
nerdymovie.blogspot.com/2025/08/sett...

Just saw this. It's a fascinating game with several variations.

Yes. It's fascinating IMHO. #rithmomachia