The computer system amazed the world last year when it mastered the game of chess from scratch within just four hours, despite not being programmed how to win.

But now, after a year of testing and analysis by chess grandmasters, the machine has developed a new style of play unlike anything ever seen before, suggesting the programme is now improvising like a human.

Unlike the world's best chess machine - Stockfish - which calculates millions of possible outcomes as it plays, AlphaZero learns from its past successes and failures, making its moves based on, a 'nebulous sense that it is all going to work out in the long run,' according to experts at DeepMind.