A market on whether the first inning of a game is scoreless; NRFI is no runs, YRFI is yes runs.
NRFI is a wager on whether either team scores in the first inning. It depends mostly on the two starting pitchers, the top of each lineup that bats in the first, and the ballpark and weather — a tighter, more modelable question than a full-game total because it involves a fixed, small set of hitters against fresh starters.
The opposite side, YRFI, wins when at least one run scores in the first. BallBet projects a model probability for the first inning from the starters and the top-of-order hitters they face.
NRFI research starts with two strong, contact-suppressing starters and the quality of the hitters due up first. The model's first-inning probability is shown on the dedicated board.
NRFI stands for No Runs First Inning — a bet that neither team scores in the first inning. YRFI, yes runs first inning, is the opposite side.
Mostly the two starting pitchers and the top-of-order hitters they face in the first inning, adjusted for park and weather. It is a narrower, more stable question than a full-game total.