Puzzles: Endgame
Puzzle #1333715 view on chess.com
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d6 would be a huge blunder for black as it allows white to win the queen.
Puzzle #mN6Px view on lichess.org
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The pawn on g2 is weak. Bring in the other rook for the attack.
Puzzle #r1Pk3 view on lichess.org
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I don't fully understand this pawn endgame, but feel that it's worth looking into.