Your opponent places your King in check with his Bishop.
You block with your Knight, a move which simultaneously places your opponent’s King in check.
Under normal circumstances, moving your Knight from this position would be an illegal move since doing so would place your own King in check (from your opponent’s Bishop).
My question is, does this move constitute check if the capture move is itself illegal?
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I'm not a huge chess expert, but I think if your only move puts your king back in check, it's called checkmate.
It's check. Wikipedia tells me it's a type of cross-check.
Ah, thanks! That's what I concluded, but I couldn't find the documentation to support it. The article says that cross-checks "are relatively infrequent in play," but that's how I discovered it. I reasoned that, because the actual capure of the opponent King is never made (ever, not just in this situation), it should be legal. My opponent agreed. Then I made a stupid move and went on to lose the game. Oh, well.