postrm is in chessx 1.3.2-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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#!/bin/sh set -e # Automatically added by dh_installmenu if [ -x "`which update-menus 2>/dev/null`" ]; then update-menus ; fi # End automatically added section