In <em>The Case of the Defaced Painting</em>, we immediately encounter details that can help us solve the mystery. Part 1 of the story contains several clues. We learn that there is paint on the floor and on the chair that is close to the painting. We also learn that Mrs. Williams seems to be angry about the fact that her husband cares about the paintings so much. Finally, we also learn that Mrs. William is not wearing her wedding ring.
Based on that the use of foreboding in this sentence is used as a noun, the definition of foreboding would be:
A feeling or sense that something bad is going to happen.
It feels like you are surround with a bright light and you are scared to death
An Oxymoron. For example saying, "One fine day, on the darkest night..."
Borges's story The Garden of Forking Paths can be considered to be a three dimensional chess game for a variety of reasons. First, like a game of chess, a nearly infinite number of possible outcomes are proposed through the story (just as how a chess game can allow for a variety of different outcomes). Also, chess is a game of choice, just as the Garden of Forking Paths - both the story itself and the novel of the same titles mentioned in the story - allows for the reader to, in essence, choose their own design and strategy. Furthermore, the lead character\protagonist in the story is manipulating events throughout the story to, in essence, score a "checkmate."