For questions related to DeepMind's AlphaGo, which is the first computer Go program to beat a human professional Go player without handicaps on a full-sized 19x19 board. AlphaGo was introduced in the paper "Mastering the game of Go with deep neural networks and tree search" (2016) by David Silver et al. There have been three more powerful successors of AlphaGo: AlphaGo Master, AlphaGo Zero and AlphaZero.
Have a look at the original research paper that introduced AlphaGo Mastering the game of Go with deep neural networks and tree search (2016), by David Silver et al., published in Nature. Have also a look at https://en.wikipedia.org/wiki/AlphaGo.