Skewer Puzzle (Rated 987): Win Material — Rook

In this chess endgame, the key tactical idea is to notice that material is temporarily vulnerable. A rook can become especially powerful when it attacks an undefended pawn while giving check, combining a forcing move with a direct material gain. White has extra pawns and useful rook activity, but Black must act accurately to avoid losing more of the remaining material. The position illustrates how tactical awareness can preserve equality even when the opponent appears materially ahead.