Player A intended to castle long. He correctly picked up the king first, but along the way dropped it on d1, picked it up again, placed it on the correct square c1, then moved the rook correctly and pressed the clock.
The opponent claimed that since he let go the king on a valid square, that is the move that must be enforced.
4.6 states that
Would seem straightforward, except that 4.6.b statesWhen, as a legal move or part of a legal move, a piece has been released on a square, it cannot be moved to another square on this move
Am I correct in assuming that from a strictly Fide point of view, 4.6.b is not applicable here because there was no evidence that the player was in the middle of castling?in the case of castling, when the player's hand has released the rook on the square previously crossed by the king. When the player has released the king from his hand, the move is not yet made, but the player no longer has the right to make any move other than castling on that side, if this is legal