If you hold a battlefield with Yasuo to reach 7 points, then gank the opposing battlefield but lose control of the first battlefield, do you still win since you scored from both battlefields in that round?

Ruling: Yes, you still win. You do not need to maintain control of the battlefield you held at the start of your turn in order to score the winning point from ganking/conquering the second battlefield.

Sequence:

• At the start of your turn (after readying but before channeling), you hold a battlefield and score point 7
• During your turn, you gank/conquer the opposing battlefield
• You score point 8 from the conquest, achieving victory
• You do not need to still control the first battlefield when you score point 8

Nuances:

• You get points by holding (controlling a battlefield at the start of your turn, after readying everything but before channeling runes)
• You do not get points by defending a battlefield you already control
• If you are at 6 points and hold one battlefield at the start of your turn, then conquer the second, you also score the 8th point