One real hand at a time

Each post is one spot from a real hand, worked through with the same two questions: what can the villain have, and what do you do.

• Should I call a river shove with top pair, weak kicker?Ace-seven on an ace-high board, and the cutoff moves all in on the river. Call or fold? Here is how I work out what he has before I put the chips in.
• Should I bet top pair on the river when he checks?Top pair, queen kicker, and the big blind checks the river to you. Bet small or check it back? Here is how I work it out, one question at a time.