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Gavin Rose adopted a change of formation with Mark Weatherstone, Matt Drage & Michael Chambers all playing in central defence, with Nyren Clunis & Nathan Green as the wing backs.
Dulwich opened brightly but they looked susceptible to quick breaks and, from one in the 8th minute, Ashley Carew did well to hold up Ryan Blake and allow the defence to regroup.
Dumebi Dumaka couldn't quite get up above Ashlee Jones in the Chesham goal as a Gavin Tomlin cross was deflected towards him, whilst a Tomlin shot that Jones couldn't hold was hacked off the line.
Dumaka could have made more of a swift break before Dulwich took a 23rd minute lead. Nyren Clunis was set away on the right and his cross fell to Nathan Green who gleefully slammed it home.
Soon after, good interplay from a well worked corner routine saw Vas Karagiannis have his shot saved low to his right by Jones.
Chesham wasted a good free kick opportunity from just outside the penalty area when Marc Weatherstone was penalised for a push; the free kick unoble to beat the wall. It then took a fantastic save from Preston Edwards to preserve the lead as he sprung to his left to push out a header from 6 yards out.
Dulwich applied more pressure as half time approached with Karagiannis and Dumaka going cross.
Half Time 1-0
Dulwich quickly doubled their lead at the start of the second half when Dumebi Dumaka scored in the 47th minute. A sublime pass from Dumebi Dumaka split the Chesham defence and gave Vas Karagiannis a clear run on goal. Jones saved his effort but the ball spun into the air. Karagiannis couldn't direct his header on goal, Dumaka missed his kick with his left foot but then smashed the ball home with his right.
Dumaka then almost capitalised on a defensive slip and Beaney fired just too high although Dulwich seemed content to sit on their lead.
However, Vas Karagiannis put the match out of Chesham's reach with a third goal in the 69th minute. Receiving the ball on the right, he turned inside and struck a left footed shot across the keeper and into the far corner. His reward was to be immediately substituted.
Chesham tried hard to get back into the game and Roberts hit the outside of the post from a free kick, before Nyren Clunis was denied after a 50 yard run at a retreating defence.
As the game entered stoppage time, Preston Edwards had to save a Roberts header, whilst Ibra Sekajja flashed an effort across the Chesham goal.
Dulwich then added a controversial fourth goal deep into stoppage time. Jones was penalised for handling a back pass, although it seemed the player had passed it towards his own goal with his knee. The free kick was played back to Ashley Carew and his shot fell kindly for Nyren Clunis to complete the scoring.
Final Score 4-0