Reference
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3.1.22 Bookmark games in ChessBase
There is no separate bookmarking feature,but there is a way to do this.
At the point in the game where you want to insert your "bo o km a rk", right-click on
the move, select "Spe c ia l a nnot a t ion" from the popup menu, and select "Set medal"
from the submenu.
Choose a medal type (I typically select "User") and click "OK".
ChessBase 2016