标量场的梯度是保守场

Items in their inventory when the game ended, across 8 games.

Item	Games	Of all games	Win rate
Ghost Scepter	5	62.5%	60.0%
Blink Dagger	4	50.0%	75.0%
Arcane Boots	4	50.0%	75.0%
Aghanim's Scepter	3	37.5%	100.0%
Observer Ward	3	37.5%	66.7%
Tranquil Boots	3	37.5%	66.7%
Dust of Appearance	2	25.0%	100.0%
Observer and Sentry Wards	2	25.0%	100.0%
Eul's Scepter of Divinity	2	25.0%	50.0%
Sentry Ward	2	25.0%	0.0%
Mithril Hammer	1	12.5%	100.0%
Linken's Sphere	1	12.5%	100.0%
Aegis of the Immortal	1	12.5%	100.0%
Hand of Midas	1	12.5%	100.0%
Glimmer Cape	1	12.5%	100.0%
Aeon Disk	1	12.5%	100.0%
Null Talisman	1	12.5%	100.0%
Kaya and Sange	1	12.5%	100.0%
Guardian Greaves	1	12.5%	0.0%
Urn of Shadows	1	12.5%	0.0%
Gem of True Sight	1	12.5%	0.0%
Perseverance	1	12.5%	0.0%
Magic Wand	1	12.5%	0.0%