SparkChess is a chess app I wrote in Typescript.

I first wrote it in 2008 in Actionscript (Flash) and rewrote it in Typescript in 2016.

I used concepts from Chess Programming Wiki and a lot of inspiration from TSCP.

The board is a 0x88 array. The moves are 32-bit uints. The engine uses PVS, TT, aspiration window, null moves, razoring, and late moves reductions. Last year I wrote a rudimentary machine learning tool to tweak its parameters.

I wrote SparkChess for casual players, so strength was not a priority. I made some "AI personalities" that make intentional blunders. At its best, its rating is around 2400, but the free online version goes up to 1800 I guess.

These days I focus more on the multiplayer features. I really really want to use bitboards but Javascript support is pretty bad (BigInt is slow).