[FEN "6k1/rp3ppq/p2p4/1p1Pr1nQ/1P2P3/4R1N1/P1B2P2/4R1K1 b - - 0 1"] 1... Nh3+ 2. Qxh3 (2. Kh2 Rxh5) 2... Qxh3
Black to move.
After Nh3+ white can move the king or take with the queen. Either way black can win the queen.
How is this tactic called?
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It's a discovered attack with check (the rook attacking the queen is the discovered attack, the check is the discovering move). As the discovering move is also an attack, this gives rise to a double attack. The check must be answered, so the queen takes the knight even though it is protected. This could also be considered a desperado from White's point of view; the queen can't be saved, so White might as well take the knight.
(I'm going to refer to chesstempo.)
I don't think there's just 1 tactic here. As other answers have pointed out, besides discovery (discoverer checks), there's also double attack or desperado. (i don't think it falls under chesstempo's desperado though. i think it's more of trapped piece than desperado, but I don't think it's even trapped piece.)