The late winner came from a speculative, astute wild-card signing in Carlos Alcaraz, slotting in the rebound of a shot from Ashley Young, a player Moyes was working with in his Manchester United days.
Glasner’s half-time response to that flash of flair was to bring on both Wharton and Eze, to almost instant effect as Mateta lashed in Guéhi’s overhead flick of a rebound following a corner.
Beto, a striker untrusted by Dyche but willing to chase channels to the point of exhaustion, a template that Moyes has often leaned on, scored a fine goal.
The Austrian and Scot were old adversaries, Oliver Glasner’s Eintracht Frankfurt denting Moyes’s West Ham on the way to winning the Europa League three seasons ago.
Having beaten West Ham last season, Glasner was seeking four successive wins over Moyes.