Obvious fact: Yahoo is a common fantasy platform. Less obvious fact: there is some scope to exploit certain features of Yahoo. One of those is with relievers who have SP/RP eligibility. Relievers generally outperform starters in strikeout rate, ERA, and WHIP. As such, it helps those stats to use relievers as often as possible. Anytime you can use a reliever in a starter slot is potentially advantageous.
Some leagues don’t discriminate between type of pitcher, so the SP/RP status doesn’t matter. Other leagues don’t have enough bench depth to effectively use relievers in a starter slot. Generally speaking SP/RP pitchers are most useful to owners who participate in the daily grind and make over 100 moves a season by cycling the last spot on their roster. Some leagues have rules that disallow this as a viable strategy. That said, you don’t necessarily need to grind in order to leverage this strategy. Below is the not-quite-definitive list based on current eligibility; I left out some scrubs and guys who will almost certainly start. Other pitchers will gain SP/RP eligibility throughout the season, and it’s useful to periodically keep track of such things.