Honeywell RTH2300 wiring issues

Trying to install a new Honeywell RTH2300 but I cannot figure out the wiring. the honeywell has ports that say B O G Y W NOT USED R Rc. I have attached a picture that shows how my current thermostat is wired. The yellow wire is not connected to anything. I have a standard heater and air conditioner. My current thermostat is a hunter brand. My confusion is that my current thermostat has one wire wired into a port that has two letters. If someone can just tell me what port to plug each wire into in my new thermostat I would appreciate it. Thanks in advance! G = green Y = blue W = white R Rc = red Thanks for the info, it works great now

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