Six Nations 2018: England v Wales
Venue: Twickenham Date: Saturday, 10 February Kick-off: 16:45 GMT
Coverage: Live radio commentary on BBC Radio 5 live, BBC Radio Wales & BBC Radio Cymru. Live text commentary and report on the BBC website and app.
The battle between England and Wales at Twickenham on Saturday will be "like a game of chess", according to Wales centre Jamie Roberts.
England have not lost a home game under head coach Eddie Jones, but his Wales counterpart Warren Gatland has secured three wins there in the last 10 years.
Roberts says, "I'm massively excited. This is a huge game for the Welsh people,"
England did not arrive back to their Surrey training base until Monday afternoon after winning in Rome while Wales beatScotland at home in Cardiff two days earlier.
"Warren Gatland will play on that travel factor," Roberts said.
"He'll make sure the lads are aware of the fact England have two days less preparation than Wales, as they played a day later and had a travel day.
"The weekend is about clarity, hard work in the week, and delivering for 80 minutes on Saturday. You talk about focus, you need perfect focus at Twickenham."
Attack: 'Saturday will be about speed of ball'
Winning the battle of the breakdown and securing quick ball will be pivotal. Eddie Jones will want England's forwards to punch holes and allow playmakers George Ford and Owen farrell to run the show, again.
"Saturday will be about the speed of ball," Roberts said.
"When England get a bit of momentum, they thrive on quick ball. It's about which team can produce the quickest ball to create the biggest problems."
Wales, meanwhile, have been experimenting with a high-tempo off-load game, which worked to devastating effect against the Scots.
"Wales' handling against Scotland was impressive," Roberts said.
"Those little tip passes, drawing players out of the line and putting players on the inside shoulder of the next defender, these are all crucial parts in the cog of creating space.
"You watch the All Blacks set the standard with how they do that - they manipulate defences with forwards coming in threes.
"When you've got the likes of [fly-half] Rhys Patchell playing flat to the line and picking those crisp, flat, hard passes on the gain line, it's almost impossible to defend against as you've got three or four players in motion.
"There's now a confidence in the Wales team to offload. That will stand them in good stead, but they won't have the freedom to play as much rugby against England."
Defence: Line speed v kicking game
Both England and Wales are famed for an aggressive defensive line and Saturday will throw up another fascinating battle between the respective defensive gurus, Paul Gustard for England and Shaun Edwards for Wales.
But while Wales did not concede a point for 79 minutes against Scotland, England were stretched on a handful of occasions in Rome.
"England bought a lot of line speed at the weekend in defence," Roberts said.
"Their first five of six defenders were really flying off the line. Wales will try and attack outside of that. They'll look to play to width and hope those England outside defenders sit off.
- England had a 60% gainline success against Italy in their seven-try victory
- Wales restricted the Scots to a 30% gainline success
- Gain line: A hypothetical line beyond which the attacking team must
- Progress to gain territory after a set piece or a breakdown in play
"England will have less space than against Italy, so I think they will kick early. We'll see more attacking kicks, cross-field kicks, little chip and chases, just to slow the line speed and counter the Wales defence.
"Choke tackling was a real strong tactic of Wales last year. England are without Vunipola, but players like Maro Itoje and Mako Vunipola, require a two-man tackle. One goes high, one low, slowing the ball down and not allowing them get to ground quickly to produce that speed of ball."
The teams: 'You need Test match players'
One of the most influential players on the opening weekend was Wales' Leigh Halfpenny, who scored his first international tries in five years.
The full-back, like his opposite number Mike Brown, has received criticism for his style of play by those who prefer flair players like Anthony Watson and Liam Williams.
But former England winger Ugo Monye says both Halfpenny and Brown will be key contributors at Twickenham.
"I find it quite interesting that Halfpenny is playing up against Brown and they're two guys who are brilliant players, but get criticism.
"You need someone to be solid at the back with decision-making, under the aerial ball, defensively really sound and with a monster boot. You need these guys in games like this."
Roberts agrees, adding both full-backs are "Test match players", who deliver when the stakes are highest.
"We talk about the difference between club players and international players. Brown and Halfpenny are guys who can handle pressure and deliver basic skills repeatedly, time after time, at the highest level."