Somerset beat Worcestershire to reach final at Lord's
They will face Essex in a five-day game starting on 23 September
Derbyshire miss out after losing by 178 runs to Lancashire
Yorkshire beat Leicestershire by 10 wickets and top North group
Surrey defeat Sussex by six wickets, their first Bob Willis Trophy win
Twenty minutes until the tea break.
We've still got three games going on with Lancashire and Warwickshire on top against Derbyshire and Glamorgan. Nottinghamshire's match with Durham looks to be heading for a draw.
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Simon Hutchins: The better solution to the problem of the North team missing out, would have been for the group winner with the most points to go straight through to the final and the other two to play off.
Last autumn was exceptional for rain, but with the Final finishing on 1 October, it means that it could easily be disrupted by bad weather or light.
That's the format they've used for the 50-over One-Day Cup previously, which I like.
The other thing with this time of year you also have to consider is the early-morning dew. Plays into as well.
But despite that, the T20 Blast finals are still taking place on 3 October.
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Stuart Fraser: I think the only plausible way you could have wedged semi-finals into this season would be to play the final in the UAE (not now the IPL's there) or the West Indies or somewhere...this wasn't a great tournament, but about as good as we could get.
Not sure many would agree it's not been a great tournament.
There was some talk back in the Spring of moving matches overseas but lots has changed since then of course.
Hosein lbw b Morley 6 (Lancashire 219 & 356-6 dec v Derbyshire 195 & 135-8)
Just two more needed now for a Lancashire win!
Jack Morley picks up his third wicket in quick succession as Harvey Hosein in pinned in front of off stump right back in his crease.
Derbyshire have lost 6-17 in the space of 54 balls.
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Nick Sanderson: So @YorkshireCCC, external are Champions of the North and Essex and Somerset get to play-off for Champions of the South.
So the top two in Division One from last season will go at it again in a winner-takes-all affair, almost exactly a year since their previous big meeting...
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Let's hope it's a bit drier than that week in Taunton was!
Dal lbw b Hartley 3 (Lancashire 219 & 356-6 dec v Derbyshire 195 & 131-7)
It's not been Derbyshire's round. Lancashire are nearly over the line.
Tom Hartley traps Anuj Dal leg before.
Harvey Hosein (2*) is joined at the crease by Mattie McKiernan.
These two put on 102 together in the first innings, Derbyshire need almost triple that now.
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Darryl Smith: Not sure anyone can argue that it's not the best two teams in the country contesting the final. An ideal world might have had the best placed runner-up joining the three group winners in semi-finals but world is far from being "ideal" at the moment.
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A great performance from Somerset. So much is said about their bowling attack but youngster Tom Lammonby scored a sensational century yesterday. They really are the complete package aren't they?
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Critchley b Morley 7 (Lancashire 219 & 356-6 dec v Derbyshire 195 & 126-6)
Oh dear - we could be in for a swift finish now!
Derbyshire all of a sudden have lost four wickets in quick succession to this Lancashire spin pairing.
Matt Critchley is the latest to fall as he is bowled off stump by Jack Morley.
Lancashire need just four more wickets to win.
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Derbyshire (195 & 122-5) need 259 more runs to beat Lancashire (219 & 356-6 dec)
Looks like we're on for a Somerset-Essex final now - put your calculators and technical committees away!
Derbyshire's fifth wicket falls moments after the fourth as Fynn Hudson-Prentice is caught at first slip by Keaton Jennings off Tom Hartley for just a single.
Cox c Davies b Davey 32 (Worcestershire 184 all out)
It's all over! Somerset will meet Essex in the final!
Ben Cox is caught behind off the bowling of Josh Davey and that wraps up a super win for the visitors.
Essex and Somerset have been the best two sides on the county circuit these last few years. They will meet at Lord's at the end of the month.
Commiserations to Worcestershire though. Ben Cox and Joe Leach gave them a scare an hour ago.
Image source, .Pennington b lbw Brooks 4 (Worcestershire 184-9 need 61 more runs to win)
One more wicket needed!
How do you bowl to tailenders? Full and straight!
Dillon Pennington swings and misses. It hits his pad and the finger goes up.
Two wickets now for Jack Brooks.
du Plooy lbw b Hartley 34 (Derbyshire 118-4 need 263 runs to win)
And now Leus du Plooy is trapped lbw by Tom Hartley.
Two new men in at the crease for Derbyshire.
Surrey (388 & 157-4) beat Surrey (415 & 128)
All over at The Oval - Ben Foakes finishes it off with a handsome pull shot for six into the empty Peter May Enclosure!
Surrey have chased down the target of 156 set for them on this last day.
Surrey beat Sussex by six wickets to pick up their first win of the competition in the last match.
That means all the matches in the South Group are complete and here's how it all finished.
Image source, .Reece c Jennings b Morley 69 (Derbyshire 118-3 need 263 runs to win)
Luis Reece falls for 69 off 135 balls with nine fours and one six.
He's caught by Keaton Jennings as he top-edges off the bowling of Jack Morley.
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Stuart Fraser: The problem with the way the Bob Willis Trophy chose who went into the final wasn't that it was going to leave one group out - it was that it was almost inevitably going to be the North Group winners.
The North just loses more cricket to rain, so fewer batting points.
You say that, but Essex look set to reach the final having only picked up six batting points to Yorkshire's 11.
Worcestershire (200 & 178-8) need 67 more runs to beat Somerset (251 & 193)
So nearly another Somerset wicket as last recognised batsman Ben Cox is dropped by Ben Green at third man off the bowling of Josh Davey.
Worcestershire are all over the place at the moment.
Lancashire (219 & 356-6 dec) lead Derbyshire (195 & 104-2) by 277 runs
Image source, Getty ImagesDerbyshire can still technically go through to the final but it requires a Worcestershire win and an unlikely victory over Lancashire.
Opener Luis Reece has just brought up his half century and his side have now past 100.
But there's nowhere near enough time left in the day for Derbyshire to add another 277 runs to win this one.
Leach lbw b Brooks 17 (Worcestershire 176-8 need 69 more runs to win)
Nearly there!
Jack Brooks replaces Craig Overton and immediately strikes.
Joe Leach never looked comfortable after the bowling changes and Brooks traps him leg before.
Somerset can smell a spot in the final now. Partnership broken!
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