Winning starts with what you know
The new version 18 offers completely new possibilities for chess training and analysis: playing style analysis, search for strategic themes, access to 6 billion Lichess games, player preparation by matching Lichess games, download Chess.com games with built-in API, built-in cloud engine and much more.
An umbrella is a pawn, which shelters the attacking king from the rain of checks of the defending rook. In a rook ending a typical winning technique is to lure an enemy pawn to an important file, so that the attacking king can hide behind it.