Discussion
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The most common form of one check involves one piece moving to deliver check, at the same time revealing a discovered check from a piece behind (such a check is an inherent part of the type of smothered mate known as Philidor's legacy). The only replies to a double check are king moves, as capturing the checking piece (except by the king, which in the process moves out of check by the other piece) is not an option since there are two of them, and interposition is likewise impossible as there would be two lines of attack to block.
In exceptional circumstances, it is possible for the moved piece not to participate in the double check. The only way for this to happen in orthodox chess is by way of an en passant pawn capture. In the position shown at right, Black has just played 1...g7–g5. White replies 2.hxg6 e.p.++. This is a double check even though the pawn that White just moved does not give check. Rather, one check is given by the rook, the other by the bishop; the former is discovered by the movement of the capturing pawn, the latter by the removal of the captured pawn. Such a double check is extremely rare in practical play, but is sometimes found in problems.
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Aron Nimzowitsch wrote that, "Even the laziest king flees wildly in the face of a double check." Because the only possible response to a double check is a king move, the double check is often an important tactical motif. A famous example is Réti–Tartakower, Vienna 1910, which arose after 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Qd3 e5?! 6.dxe5 Qa5+ 7.Bd2 Qxe5 8.0-0-0! Nxe4?? 9.Qd8+!! (sacrificing a queen in order to set up a double check) Kxd8 10.Bg5++ and White mates after 10...Ke8 11.Rd8# or 10...Kc7 11.Bd8#
A double check was also seen in the celebrated Evergreen Game, Anderssen–Dufresne, 1852. From the diagram at right, Anderssen won with 20.Rxe7+! Nxe7 21.Qxd7+!! (a queen sacrifice to set up a deadly double check) Kxd7 22.Bf5++ Ke8 (or 22...Kc6 23.Bd7#) 23.Bd7+ Kf8 24.Bxe7#
Read more about this topic: Double Check
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