That move is legal. The rook is allowed to move through a threatened square, the king is not.
Long Castle through Check.
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Apr 10, 2024
0
#3
Technically there's no rule that you cannot castle through check. The rules are that you cannot castle out of or into check, and that your rook cannot be threatened when the castle is completed. People just like to say that you can't castle through check because in order to do so, you would usually have to break one or both of the two rules I mentioned above. But this is one of the rare cases where it is actually legal to castle through check.
Apr 10, 2024
0
#4
OraleVato8 wrote:
Technically there's no rule that you cannot castle through check. The rules are that you cannot castle out of or into check, and that your rook cannot be threatened when the castle is completed. People just like to say that you can't castle through check because in order to do so, you would usually have to break one or both of the two rules I mentioned above. But this is one of the rare cases where it is actually legal to castle through check.
The FIDE rule isn't directly worded that way but states the king can't move through or into an attacked square.
3.8.2.2 Castling is prevented temporarily:
3) If the square on which the king stands, or the square which it must cross, or the square which it is to occupy, is attacked by one or more of the opponent's pieces
The US Chess rule is worded similarly
[Site "Chess.com iPhone"]
[Date "2024.04.10"]
[Round "?"]
[White "playa4kash7"]
[Black "Phurious1"]
[Result "0-1"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
[WhiteElo "872"]
[BlackElo "889"]
1.d4 d5 2.Bf4 Nf6 3.a3 Bf5 4.Nc3 e6 5.h3 Nc6 6.Nb5 Bd6 7.Nxd6+ cxd6 8.Bg5 O-O 9.f3 h6 10.Bh4 g5 11.Bf2 e5 12.g4 Bg6 13.c3 e4 14.h4 exf3 15.exf3 Nh7 16.hxg5 hxg5 17.Be3 Re8 18.Qd2 Qf6 19.O-O-O Re6 20.Nh3 Rae8 21.Bxg5 Nxg5 22.Nxg5 Re3 23.Rh3 Qxg5 {0-1}
Move 19 is illegal correct?