It's Silfir's Chess Accuracy Corner! The Semi-Regular Column No One Asked For!
Sadly, today was not a particularly good day for all of us die hard fans of accurate depictions of chess in manga.
Let's start with the game between Rei and Prince Rodd. There are all manner of continuity issues between the shots we get of their game; for instance, between the first image we get and the second all pieces shown jump one square to the bottom left of the board (from Rodd's) perspective and the white pawn disappears. What is remarkable about the position seen at the bottom of page 5 is that it actually does feature a check that can be directly answered with a checkmate. Rei's queen delivering check is unprotected, and once Rodd takes it with his rook, that rook, the black queen and the black knight that is depicted standing next to a black bishop combine for checkmate. It seems like the author of the adaptation, Aono Shimo, tried specifically to construct a position to match the script.
To confirm this theory, I checked a translation of the webnovel chapter:
“It’s a checkmate”
Although it’s a development I foresaw, for the time being I confirmed it.
Even if I take his rook with a bishop, it will fall prey to a knight and my king will be taken in a few turns.
Even if the king escapes, rook will rampage and tear the defensive formation into shreds.
Also, in a few turns he can promote his pawn to a queen.
I’m checkmated.
Far from being an instant checkmate, the novel seems to suggest that Rodd was simply announcing that he had a forced checkmate in a certain number of moves, though it follows up with an explanation of the position that doesn't suggest checkmate is in any way imminent - if Rodd is going to have to convert a pawn into a queen first, checkmate is many moves away, even if the position is hopeless. I don't exactly blame the author of the adaptation for misunderstanding this, because it's a thankless task to be asked to re-create a chess game visually that is very unlikely to have actually existed in a real sense, especially without any chess knowledge. (The effort that IM Silman went through to "reconstruct" the chess game at the end of Sorcerer's Stone for the movie is evidence that it's difficult even if you do know chess.) Page 5 looks very much like the result of someone frantically trying to construct a position in which a check by the queen is countered by an instant checkmate with the rook.
The position is complete gobbledygook by any reasonable standard - as a position that could be reached with one of the players being actually any good at the game. Both kings are so hopelessly exposed that checkmate should have happened a long time ago. Any talk between characters that suggests this game is evidence of any sort of skill is laughable; only two complete beginners could have ended up in this position.
The second game we are privy to is played between Rei and Claire. This one at first follows a path that is perfectly plausible, and can be reproduced as follows:
1. e4 e5
2. Nf3 Nc6
3. Bc4 d6
4. Nc3 Bg4
But after that it looks like the artist simply gave up. Claire announces check, but Bg4 doesn't check anything. Some panels later, 5.h3 by Rei follows (perfectly reasonable move) and that's when so-called strategic genius Yuu Bauer pipes up and suggests Qf4. This is a syntactically correct chess move. It is, however a) illegal, b) not very good if it was legal, c) actually, the board is set up wrong and the kings and queens are swapped on both sides of the chess board anyway. In this case the web novel author deserves some credit:
“Hmph… Claire, Qf4”
“Eh…? Ah!”
The one who interrupted Claire-sama’s pondering was Yuu-sama.
Moreover, what he said was inconsiderate.
Qf4 refers to the way of moving a piece.
Q means queen, f4 is the specific location on the board.
Like that my defense will break, it’s a strong move that will tip the situation in Claire-sama’s favor straight away.
This sequence is quite plausible and accurately describes how to interpret Qf4. It's very much plausible for Qf4 to be a move that decides a kingside attack, given the right position. It's fairly likely to be a "silent, but strong" type of move that creates a threat that can't be parried, or only by sacrificing so much material that the attacker will win eventually anyway. It appears the manga author simply punted on trying to construct that position and went for a basic position that may arise out of the Italian opening (if Black doesn't really know what they're doing).
In conclusion - points should be awarded for the physical aspect of the adaptation; aside from minor continuity errors and swapping the queen and king by accident, the board has the correct number of squares, aesthetically correct pieces and even is set up with the white square in the bottom right corner, as it should. As for the actual chess, I get the impression that a light novel author with some chess knowledge matched up with a mangaka without it, and while both clearly put in a reasonable amount of research, it doesn't add up to something convincing.
Bonus!!! Poker Accuracy Corner!
Both web novel author and the mangaka deserve some credit for creating a logical course of events that matches the cards each player received (though for some reason the mangaka opted for different cards), and their decisions to exchange cards. It's also pointed out by the author explicitly that there was no betting involved. Of course, that completely removes virtually any element of actual skill, running into the age-old trope of showing someone is great at poker by having them show off a four of a kind or (god forbid) a royal flush, which proves nothing about their actual abilities at their game - at best, like here, it proves they're great at cheating at cards. And there is little more pathetic than cheating at cards when there isn't even any money involved. What a tool, that Yuu Bauer. Though at least you can interpret this scene as Yuu testing the other players involved - anyone who is genuinely impressed by his win can be dismissed as a complete idiot, and it seems only Rei passed his test.