A rook and pawn can hold a queen if they build a fortress. Keep the pawn on its starting square, the rook on your third rank where the pawn guards it, and your king next to the pawn. The enemy king can't cross your rook's rank, and the queen alone can't break in. Shuttle the rook between the two squares the pawn guards. It works with any pawn except a rook pawn.
Every move is checked with an endgame tablebase, which knows the exact result of every position with up to seven pieces. The computer defends perfectly, and if a move throws the result away, the trainer stops and shows you a better one.
