From The Devotion of Suspect X by Keigo Higashino:
“You know, chess really isn’t my kind of game,” Kusanagi muttered.
Yukawa rolled his eyes. “Here he goes again.”
“First of all, what’s all this about taking your opponent’s pieces and not being able to use them? They’re the spoils of war! Why can’t I add them to my army?”
“Don’t go blaming the rules of the game. Besides, the fact of the matter is your opponent’s pieces aren’t spoils, they’re soldiers. When you take them off the board, you’re kiling them. Not much use for dead soldiers.”
“But you can use them in shogi!”
“Well, credit the man tho though t up shogi for being so flexible. I suppose that when you capture pieces in shogi your’e making them surrender, not killing them. That’s why you get to use them again.”
“Chess should be the same way.”
“I don’t think going turncoat sits well with the spirit of knightood.”
(pg 39-40 in the ARC)