The biggest movers of the day appear to be the gaming firms with Betfair and bwin.party unwanted. The latter is 14% under as of Thursday afternoon.Germany's State Lottery Treaty has proposed a 16.67% levy on sports betting stakes, worrying investors in both groups that the operations in the country may be pulled.Finnish miner Talvivaara also took a hit after the company lowered annual production guidance to take into account longer than previously anticipated maintenance breaks. Retailers are also off the mark, with Halfords a notable faller. Peel Hunt has cut its target price by 11% and reiterated its 'hold' to reflect new 2012 margin guidance of a 30 basis point decline.Oil rig services group Lamprell has confirmed rumours that it is in talks to acquire Norwegian peer Maritime Industrial Services (MIS), pressuring shares lower on Thursday afternoon.Plastics group Victrex is off the mark despite recording a 22% increase in half year sales volumes.---bcFTSE 250 - RisersNorthgate (NTG) 328.00p +3.40%RPC Group (RPC) 302.00p +1.51%Imagination Technologies Group (IMG) 453.80p +1.27%Dairy Crest Group (DCG) 365.50p +1.08%BH Macro Ltd. GBP Shares (BHMG) 1,690.00p +0.96%TR Property Inv Trust Sigma Shares (TRYS) 84.70p +0.83%Caledonia Investments (CLDN) 1,764.00p +0.80%Elementis (ELM) 158.70p +0.70%Dunelm Group (DNLM) 425.80p +0.66%JD Wetherspoon (JDW) 424.70p +0.64%FTSE 250 - FallersBwin.party Digital Entertainment (BPTY) 144.20p -13.34%Talvivaara Mining Company (TALV) 542.50p -6.47%Halfords Group (HFD) 347.20p -5.81%Carpetright (CPR) 635.00p -5.44%Rank Group (RNK) 141.30p -4.98%Betfair Group (BET) 949.50p -4.28%Hays (HAS) 114.90p -3.85%Lamprell (LAM) 345.70p -3.79%JD Sports Fashion (JD.) 859.50p -3.64%Rathbone Brothers (RAT) 1,146.00p -3.37%