The tenth century of James Rio led Sumrest to the first boycott championship unlikely to win this season, which is a success of three times against Essex in Tonton.
After it was 78-5 in one stage in their second roles, with a chase 321 to win, the host side started the last day in 216-6, still needed 105.
But Rew got his grades from 65 to 116 great balls, off 189 balls, with 18 four, and exchanged seventh position on 133 with Craig Opton, who contributed 53 abroad, to complete a wonderful battle.
Overton ended the match 25 minutes before lunch with six straights off Simon Harmer, which converted him to 111 a half -century ball resulting from uninterrupted focus and application in case of pressure.
Essex allowed matters to slip with some of the spraying bowling in the previous evening and its players found slim help in the last stadium that helped seek and spin greatly in the previous sessions.
They had to settle for three points, after they were at the top for long periods, while Somersrest had a welcoming 19 after a disappointing start of the campaign.
The Essex attack will be welcomed by the first meaningful cloud cover for the match when he started playing with 12 exaggerated to a second new ball, and the Sam Cook opened from the end of Marcus Trescothick Pavilion and Off-SPInner Harmer that operates from the end of the river.
Overton, who was not defeated in four nights, played and lacked in the first delivery of the morning from Cook, but soon he and Rew eaten in 105 runs needed to win, and the last cooking through the middle of the middle of the first border and placed from the second to the third of the next ball.
Overton ruling itself in a wonderful way against Harmer, the content to choose gaps in the field for the other and the second, with its long conspiracy to deny any spinning. Rew, who had looked at the main model in the previous evening, was more aggressive as the result went through 250 and moved to the nineties.
With the sun's interruption, the husband negotiated safely in the opening half of the opening, and faces some warnings. But there is still the issue of the new ball, which was taken at 258-6, with 63 wanted and Essex under pressure to break the position.
Cook began his second talisman from the morning. At the other end, Jimmy Porter found the inner edge of the REW striker only to fly the ball through the goalkeeper Michael Bieber for four, and a Sumerist man took to 97.
His 161 -ball pods reached a back shot across the leg side of two people off Porter, which are mature roles from a young player who seems estimated for an international future. There was still a job to do, but Somersie began searching for the firm favorite as Opton brought the hundred partnerships.
Essex soon returned to Harmer from the end of the river, who overcame the outer edge of Rio's bats at the beginning with the most difficult ball. But it was a rare moment of anxiety for Sumerrest, where Overton, who moved with patience to 27 without hitting the border, opened his shoulders to the leadership of Hamer until midfield.
Rew also felt that victory was confirmed because it was cut with some of the shots that were gently hit. But his wonderful contribution ended with only nine required runs, LBW aims to launch Harmer on the leg side.
It was not a little important, as Overton Off-Drowing Harmer was for four, then broke the ball on his head, pumping a fist with the start of the celebrations in the home dressing room.
European Central Bank Correspondents Network is supported by Rothesay
