Resuming at his overnight score of 180, left-handed Yard continued from where he left off on the opening day as he punished the erractic Bangladesh bowlers to all corners of the park as Sussex declared their first innings at 549 for seven.
Yard, who completed his three hundred of the season on Sunday, quickly arrived at his doubt ton and his innnings assumed menancing proportions before he was pouched by Mohammad Ashraul off Aftab Ahmed for 257.
His overnight partner Tim Ambrose also carried on the good work notching a strokeful 78.
Enamul Haque jnr was the most succesful of the Bangladeshi bowlers grabbing figures of three for 174 from 33 marathon overs of which two were maidens.
Batting first time, Bangladesh got off to a rocky start with the top-order being dismissed in a heap. Openers Shahriar Nafees and Nafees Iqbal made a cautious start adding 32 before Nafees fell to Lewry for 12.
Shahrair Nafees and Aftab Ahmed soon followed Nafees to the pavilion scoring 16 and one respectively.
Skipper Habibul Bashar entertained the Hove crowd for a while playing some pleasant shots before he retired hurt for 22. He struck four boundaries.
Rajen Saleh and Mushfiqur Rahim were at the crease as Tigers reached 77 for four.