Google Nest Community

Trying to figure out is the Nest 3G thermostat will work with my system shown in picture. I do plan to install a nest c wire adapter - but cant figure out how to wire the Nest thermostat. I have a white wire going to “O” - and a jumper wire from Y to...

Attached is a picture of my existing thermostat. It shows the Y wire connected to W. Not sure how to wire the Nest. So, I have - Red wire to “R”, White wire to “O”, Green wire to “G”, Yellow to “Y” but there is also a short wire from Y to “W”. Confus...