1
The King in Check
White still has both castling rights and the king would love to run to a safe corner. But there is a check on the board: find the reply that answers the check and pockets material at the same time.
★★
2
The Rook May Cross the Fire
White must tuck the king away and stop the invasion down the b-file. The path looks blocked — but is it really?
★★
3
The Rook Under Fire
Black's bishop on the long diagonal is already eyeing White's corner rook, and the white king still sits in the centre with the e-file wide open. White to move must solve both problems at once.
★★
4
Castling Isn't Always Available
White still holds kingside castling rights and the rook is under attack. Before moving the king, check every square involved: there is a way to save the rook, and only one.
★★