Consider the following MWE, with a .tex file as follows:
\documentclass{article}
\usepackage[style=authoryear-comp,backend=biber,natbib,hyperref=true]{biblatex}
\addbibresource{References.bib}
\begin{document}
\citet{binmore} is an earlier chapter than \citet{binmore2} is.
\citeauthor{binmore}'s \citeyearpar{binmore} chapter is an earlier one than \citet{binmore2} is.
\printbibliography
\end{document}
And a .bib file containing:
@inbook{binmore,
title = "Nash Bargaining Theory I, II, III",
author = "{Kenneth G.} Binmore",
booktitle = "The Economics of Bargaining",
publisher = "Oxford: Blackwell",
editor = "{Kenneth G.} Binmore and Partha Dasgupta",
pages = "27 -- 46, 61 -- 76, 239 -- 256",
year = "1987"
}
@inbook{binmore2,
title = "Perfect equilibria in bargaining models",
author = "{Kenneth G.} Binmore",
booktitle = "The Economics of Bargaining",
publisher = "Oxford: Blackwell",
editor = "{Kenneth G.} Binmore and Partha Dasgupta",
pages = "77 -- 105",
year = "1987"
}
As you can see in the output below, the \citeyearpar{binmore} entry does not show (1987a); instead it shows (1987).
In my opinion, this is inconsistent and may lead to confusion. Therefore, how can I get \citeyeapar{...} to show (1987a) instead of just (1987)?
Thank you all very much in advanced for your time.


\citeauthor{binmore}'s \parencite*{binmore}. The advantage is that you will get the hyperlink for free. – moewe Dec 05 '18 at 10:30author = "{Kenneth G.} Binmore",should not be necessary,author = "Kenneth G. Binmore",should do the same. If you want to be sure, you can of course useauthor = "Binmore, Kenneth G.",. I would also split thepublisher = "Oxford: Blackwell",intolocation = {Oxford}, publisher = {Blackwell},– moewe Dec 05 '18 at 10:31\cityearpar{...}forparencite*{...}for the free hyperlink... Any downside?). Regarding your second comment: even if unnecessary, are the braces{...}wrong? I only use them wheneverbiblatex(or something else) may get confused between what belongs to the name and what to the surname. And finally... OK: I'll split the location as well! Thanks a lot! :) – EoDmnFOr3q Dec 05 '18 at 10:35biblatexknows how to split names likeKenneth G. Binmoreand so{Kenneth G.} Binmoreis really not necessary (see also https://tex.stackexchange.com/q/557/35864). Indeed it will change the initials produced by Biber (the former gives "K. G. Binmore", the latter only "K. Binmmore"). In general I would avoid unnecessary braces wherever possible (there were some recent issues like https://tex.stackexchange.com/q/414685/35864 caused by unnecessary braces). – moewe Dec 05 '18 at 10:51