@meidunk
It was mentioned at least three times up to this point though and kind of important for story and character development.
So yes, he is adopted and not to avoid incest.
@JumboWheat01 @Bobber
It's PokeDevil TCG (as said on the back on the cards) which seems to be totallynotPokemon franchise in this manga with it's own TV series, toys and other staff, so it's safe to say this is referencing Pokemon TCG
Which is a real thing by the way.
Imagine fatshaming, false accusing and insulting a noble in medieval society while abusing your hero authority just because you didn't like the guy or was envious of his waifu. He almost asks to be disposed of, especially because they have another hero who is so much better. I think our MC...
@twinklecake
Wholesome romantic relationship. Baron likes her, she likes him and he's just got his new healthy body and yet to be corrupted, so he is as good of a person as a demon worshipper can be. Hero B is just being lawful stupid here.
@youeverjust
A lot. Keep in mind that a move is only a half of a turn, so even regular chess game takes around 70 moves on average.
I think I've seen average number being twice as big as for regular chess, so 120-160 moves (or 60-80 turns)