  We present a measurement of the anisotropic and isotropic Baryon Acoustic
Oscillations (BAO) from the extended Baryon Oscillation Spectroscopic Survey
Data Release 14 quasar sample with optimal redshift weights. Applying the
redshift weights improves the constraint on the BAO dilation parameter
$\alpha(z_{\rm eff})$ by 17\%. We reconstruct the evolution history of the BAO
distance indicators in the redshift range of $0.8<z<2.2$. This paper is part of
a set that analyses the eBOSS DR14 quasar sample.
