In the latest update of Cs a new serversetting got added : sv_enablebunnyhopping. By default, this setting is set to 0, so it really isnt possible to Bhop atm. Imo this should get fixed because it makes a few maps unplayable or very hard to play on. (skillsurfmaps, surf_buck_fever and surf_buck_wild for example) It also slows down gameplay which really isnt necessary.