a game of chess
Chess is all about attempting to gain power over the board and over your opponent, therefore Eliot might be interested in chess as an allegory for sex and sexual violence because in the stories and myths that he references there is always an evident power imbalance (Ophelia, Philomela, Dido) where one sexual partner, most often the woman, must be subjugated. In other words, sex here is most often portrayed as a power play/battle for dominance. In a series of calculated moves the women are conquered and strategically ruined, as one strives to do to their opponent during a game of chess.