Here's how Overwatch's leave game penalty works

[Administrator]

If you leave too many Overwatch games while they're in progress you will incur a 75 per cent XP penalty. Blizzard explained how the system works on the Overwatch forum.
You're considered a 'leaver' if you leave a game after the 'Assemble Your Team' phase and before the match ends. But you are not considered a leaver if you exit before the 'Assemble Your Team' phase is over, or after you see the 'Victory' or 'Defeat' words across the screen.
Your 'leaver' ratio is based on your 20 most recent games, and if it falls too low, you will be warned in the bottom-left of your screen. If you continue to leave games after the warning, you will incur the 75 per cent XP penalty.
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