Here we have an Age of Empires 2: Rise of the Rajas match between top-tier players TheViper and Dogao, with commentary by ZeroEmpires and EscapeAoE. A few key moments in the commentary stood out.
Suffering from economic raiding, TheViper identifies cost-effective spots for watchtower placement. One tower in particular stands out as being in range to protecting three different resource patches, apparently netting good value from the wood and stone invested in the structure:
Unfortunately for TheViper, Dogao's harassment is able to continue due to a vulnerable angle and an exposed second wood patch. TheViper is forced to invest in more defensive watchtowers on a small tree cluster that will be quickly exhausted. Down the line, the opportunity cost of constructing those towers will hurt, as villagers mining stone for towers are not gathering food or gold for teching up: