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It’s about that iconic descending musical notes accompanying the onslaught of the aliens…

The more aliens a player shot, the faster they approached; their drumbeat quickened, the tension mounted. Ironically, says Bill Adams, director of game development for Midway Manufacturing Co., of Chicago, Ill., which licensed Space Invaders for sale in the United States, these features of the game were accidental. “The speeding up of the space invaders was just a function of the way the machine worked,” he explained. “The hardware had a limitation — it could only move 24 objects efficiently. Once some of the invaders got shot, the hardware did not have as many objects to move, and the remaining invaders sped up. And the designer happened to put out a sound whenever the invaders moved, so when they sped up, so did the tone.”

Accident or not, the game worked. As of mid-1981, according to Steve Bloom, author of the book Video Invaders, more than 4 billion quarters had been dropped into Space Invaders games around the world — “which roughly adds up to one game per earthling.”

But Space Invaders also enjoyed at least one special home-grown revival earlier this month. Hobbyist Nu Iotachi used an Arduino Pro Micro board to build their own Space Invaders arcade cabinet that’s just 3.15 inches tall (80 millimeters).

Made from thin hand cut plywood with pinhead joysticks, “Its Microchip ATmega328 microcontroller contains a processor running at 16MHz,” reports the project’s site Hackster.io, “which is far faster than the processor in the original Space Invaders arcade cabinet.”

“For example, the ‘castling’ move was only introduced in its current form in the 17th century. What would chess have been like had castling not been incorporated into the rules?”

AfterAlphaZero was trained to play 9 different “variants” of chess, it then played 11,000 games against itself, while the researchers assessed things like the number of stalemates and how often the special new moves were actually used. The variations tested:

– Castling is no longer allowed
– Castling is only allowed after the 10th move
– Pawns can only move one square
– Stalemates are a win for the attacking side (rather than a draw)
– Pawns have the option of moving two squares on any turn (and can also be captured en passant if they do)
– Pawns have the option of moving two squares — but only when they’re in the second or third row of squares. (After which they can be captured en passant )
– Pawns can move backwards (except from their starting square).
– Pawns can also move sideways by one square.
– It’s possible to capture your own pieces.
“The findings of our quantitative and qualitative analysis demonstrate the rich possibilities that lie beyond the rules of modern chess.”

AlphaZero’s ability to continually improve its understanding of the game, and reach superhuman playing strength in classical chess and Go, lends itself to the question of assessing chess variants and potential variants of other board games in the future. Provided only with the implementation of the rules, it is possible to effectively simulate decades of human experience in a day, opening a window into top-level play of each variant. In doing so, computer chess completes the circle, from the early days of pitting man vs. machine to a collaborative present of man with machine, where AI can empower players to explore what chess is and what it could become….

The combination of human curiosity and a powerful reinforcement learning system allowed us to reimagine what chess would have looked like if history had taken a slightly different course. When the statistical properties of top-level AlphaZero games are compared to classical chess, a number of more decisive variants appear, without impacting the diversity of plausible options available to a player….
Taken together, the statistical properties and aesthetics provide evidence that some variants would lead to games that are at least as engaging as classical chess.

“Chess’s role in artificial intelligence research is far from over…” their article concludes, arguing that AI “can provide the evidence to take reimagining to reality.”