Chelsea use rugby shields against Arsenal: Xabi Alonso's strange weapon before the corner-kick giants

London, autumn has not yet painted the trees around Stamford Bridge gold, but at the Cobham training ground, the sound of violent collisions already echoes. Not the sound of a ball hitting grass, but flesh hitting shields. Valentin Barco and Pep Chavarria, Chelsea's two young defenders, stand there, gripping rugby pads with both hands, absorbing full-force charges as if they were stopping a line break in England's top rugby division. This is not a training session preparing for a match against Leeds. This is a ritual preparing for an aerial war, where Arsenal has reigned supreme all last season. The context of this strange ritual lies in the number 22. Twenty-two goals from set pieces that Arsenal scored last season – a number that haunts any Premier League defense. When the fixture list brought Chelsea to the Emirates on September 6, Xabi Alonso, the new Spanish coach, understood that this London derby is not just a clash of playing styles, but a clash of defensive philosophies. Chelsea has scored 7 goals in 2 matches, but has also conceded 5. Attacking explosiveness paired with defensive fragility – an imbalance Alonso knows Arsenal will exploit mercilessly. His method does not lie in new tactical formations, but in recreating the feeling of physical collision. Barco and Chavarria hold shields, teammates charge at full speed and force, simulating exactly the physical duels in the box when the ball is swung in from a corner kick. This is how Alonso puts his players into a real fighting state, where there is no room for hesitation. He states his view clearly: physical contest ability is the key to standing firm against Arsenal's 'giants'. And Chelsea has reason to believe – they possess the league's best average height, level with Leeds, an undeniable structural advantage in aerial duels. But there is a blind spot that the 'strange weapon' narrative is obscuring. Arsenal is not only strong at set pieces because of height, but because of organization and calculation in every movement. Chelsea's focus on simulating physical collisions may help them win individual duels, but does it solve the problem of reading situations and judging the point of delivery? Meanwhile, Arsenal is facing personnel losses with Bruno Guimarães and Cristian Mosquera absent, creating instability in their defense. This is an opportunity Chelsea needs to seize, but also a trap if they focus too much on a single aspect of the match. Based on my experience following London derbies, these clashes are usually decided by the smallest detail. A touch, a movement, a moment of lost concentration. Chelsea is trying to control those details by recreating physical pressure in training. But football is not just about collisions. It is also about subtlety in every pass, the ability to read the game, the calmness in the box when the ball slows down. Alonso's method may create a psychological edge before the match, but it will only be truly judged when the referee blows the final whistle. Tonight, when Chelsea steps onto the Emirates pitch, they carry invisible shields in their minds. They have prepared for the aerial war, but are they ready for what happens on the ground? Arsenal is not just corner kicks. They are a collective that knows how to hurt opponents in many different ways. And in football, as in poetry, sometimes what you don't prepare for is exactly what brings you down. The pitch is a page, each season a long stanza. And this derby, with all its strange preparation rituals, will be a verse both teams will have to live with all season. Glory eventually falls, only the poems about it remain standing. The question is not who will win, but who will write the more memorable verse.