If you place an each-way bet in darts it means you will win if the player you wagered on makes the finals of a tournament. It actually counts as two bets. For example, let’s say to win the PDC World Championship Gerwyn Price has odds of +550. If you bet him to win outright on a $100 bet you would make $550 profit plus your stake if he wins, but if he makes it to the final and losses you have lost your $100 stake. If you do the same bet each way, it will count as two bets $100 “win” bet and a $100 “place” bet so your stakes are doubled. Now if Price wins you would win on both your bets making around $825 in profit. If he only makes it to the final but loses you still win on your placed bet but not on the “win” bet so while your profits aren’t as high you still would make around $175. Different sportsbooks will offer different odds and some might have each-way bets that pay out if players make the semi-finals.