The missing piece (chess) (Posted on 2008-06-12)

What is the missing piece (marked "?") in this configuration of a normal chess game?

BLACK

WHITE
Notice that the Black King is in check by the White Rook.

	Submitted by pcbouhid
Rating: 4.0000 (8 votes)
Solution:	(Hide)
The answer is indeed the White Bishop that runs in black squares. For a detailed analysis, see Dej Marīs solution, which is very precise. He granted me this permission, to avoid possible mistakes in my translation into English of my solution, which is quite similar (differ only in the order of the conclusions).

	Subject	Author	Date
	re(7): An impossible check?? (partial spoiler)	pcbouhid	2008-06-13 13:04:53
	re(6): An impossible check?? (partial spoiler)	Dej Mar	2008-06-13 12:28:13
	re(5): An impossible check?? (partial spoiler)	pcbouhid	2008-06-13 09:41:32
	re(4): An impossible check?? (partial spoiler)	Dej Mar	2008-06-13 03:02:40
	Oh, now I see (spoiler)	Steve Herman	2008-06-13 00:30:55
	re(3): An impossible check?? (partial spoiler)	pcbouhid	2008-06-12 21:51:07
	solution	Dej Mar	2008-06-12 21:02:11
	re(2): An impossible check?? (partial spoiler)	brianjn	2008-06-12 20:27:35
	spoiler	xdog	2008-06-12 16:46:48
	re: I'm almost there (spoiler)	Steve Herman	2008-06-12 15:46:30
	re: I'm stuck (spoiler)	Steve Herman	2008-06-12 14:02:17
	I'm stuck (spoiler)	Steve Herman	2008-06-12 13:39:47
	re(2): An impossible check?? (partial spoiler)	Charlie	2008-06-12 13:14:13
	re: An impossible check?? (partial spoiler)	Dej Mar	2008-06-12 11:43:33
	An impossible check??	brianjn	2008-06-12 10:48:31