This puzzle should take you 10 seconds or less to solve.
White to move.
rh1xh5+, g6xg5; rh6+, kxh6; Qf6+ Kh7, Qg7+ mate
This is a good fun brain teaser
This was from an actual game in STL
This is from an actual game by GM Ivkov
This was an actual game from the STL Winter Classic
Black to move. What should black do?
Rook and pawn endgame can be tricky
This game was from 2013 in Moscow
This is from the Carlsen - Caruana game 6
This is an actual game at the Women's World Chess Championship