Defend against check, avoid discovered check
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In this level your king is in check. You have to defend against the check, and avoid losing material to a discovered check.
See the course introduction for an explanation on how to defend against threats and avoid tactics for your opponent.
Examples
Black has just given a check with Rg2+.
White has two legal moves: Kh1, and Kf1. Which one is right?
1.Kh1? would lose the unprotected knight on d3 to the discovered check 1...Rd2+.
Therefore White has to defend with Kf1.
Black has just played Bc5+.
Nd4, Bd4, Qe3, Qf2, and Rf2 would all lose material.
1.d4? would lose to a discovered check: 1...cxd3+ en passant.
The en passant capture is a special case of discovered check. The pawn moves, and captures the pawn "out of the way" of the bishop.
This is possible because en passant is the only capture where the capturing piece is on a different square than the captured piece.
After 1...cxd3+, the bishop c5 gives check, and the pawn on d3 attacks White's queen on e2.
So the solution is to avoid this and play Kh1.