There are quite many people who do not give rematch when they win, but ask for rematch when they lose. What do you think?
A good general recognizes when his enemy is goading him into a fight, and is willing to refuse to give battle until he knows he is ready.
Channeling your inner Sun Tzu, I see!

I think the word ‘luck’ in this thread is being misused instead of ‘fortunate’.
Luck within the context of games has very precise usage, and refers specifically to chance based events that result from a random process, such as the throwing of dice, or the flipping of a coin.
Those are known as games of chance, or sometimes games of luck. I've already pointed out that chess isn't a "game of luck", i.e., I said that luck isn't inherently part of chess. But luck can and does play a part in the results of some games of chess, and I've already given examples. If someone said to Anand after that game, "You were lucky he didn't see that mate-in-one," that's a perfectly valid statement.
>Even outside of this specific usage it feels odd to me to call miscalculations/blunders good luck/bad luck, as by extension you would have to call Magnus Carlsen very ‘lucky’ to always win his games, when in fact he wins more often than most due to his superior ability and skills of calculation.
No. As I've already said, luck only applies when someone plays blatantly below their ability, i.e., a major blunder that they wouldn't normally make. If someone plays the best game they can, and they still lose, there's no luck involved.