Hi,Nugso. I think "We could win this game"means "We can win this game"and "the thing has gone". Could is the past tense of can.
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NugsoWe could have won this game.We could have picked....You could have defeated him....
NugsoA friend of mine keepsShocking! I hope you can still remain friends after you tell him/her how wrong this is!tellingsaying could in these such situations;We could win this game.(The game is already over)
Nugso What about even If you had played well we could not win this game.No -- after the game is over, it would be "Even if you had played well, we could not have won this game."
NugsoWhat about even If you had played well we could not win this game. Is second one correct?No.
Nugso"could" (without "have") cannot be used to express past success even though "could not" can be used to express past failure. It's an oddity of "could".Here's an example that will illustrate the point.