Defensive and offensive AI became more adept at finding open space and reacting to shifting tactical situations. The Master League Evolution

New dribbling systems and free-kick techniques—including lay-offs for a second player—added layers of strategy to set pieces and one-on-one matchups.

(released in Europe as Pro Evolution Soccer 4 ) is widely regarded as one of the most significant entries in Konami's long-running football simulation series. Released in early 2005 for PlayStation 2, Xbox, and PC, it refined the series' trademark realism while introducing major improvements to its core modes and presentation. Gameplay & Realism

For the first time in the series, referees are visible on the field, reacting instinctively to fouls and applying the advantage rule.