Xabi Alonso's Chelsea experiment with a back three continues, but questions remain over its effectiveness and long-term viability. The Blues' 3-4-3 formation produced a mixed result against Real Sociedad, with a strong second half but a poor first half that saw them concede an early goal. The system's fluidity and adaptability are strengths, but it also revealed defensive vulnerabilities. The introduction of Enzo Fernandez as a substitute was met with a bizarre reception, reflecting the ongoing transfer saga and the player's importance to the team. Joao Pedro's red-hot form and lack of options at striker highlight a critical area of concern for the club. With the season looming, Alonso must decide whether to stick with the 3-4-3 or revert to a more traditional formation, and the team's performance will be key to answering this question.