Scientists have trained a four-legged robot dog to become a goalkeeper – and it has an even better shot-blocking rate than Premier League keepers. The robotic goalie was trained up by scientists at the Hybrid Robotics Lab, University of California, Berkeley. Video footage shows it squat, jump, sidestep and dive to stop shots and move back to its starting position after making a block. It can save 87.5 per cent of shots taken on goal, compared to the average for human keepers of around 69 per cent, the experts say. In all competitions this year, England and Everton number one Jordan Pickford has a save rate of 69.4 per cent, for example. In all competitions this year, England and Everton number one Jordan Pickford has a save rate of 69.4 per cent, for example Reinforcement learning (RL) is a subset of machine learning that allows an AI-driven system (sometimes referred to as an agent) to learn through trial and error using feedback from its actions.