Weiß am zug - mate in 4

Efim Bogoljubov vs Rudolf Spielmann, Stockholm, 1919

[FEN "3rkq1r/1pQ2p1p/p3bPp1/3pR3/8/8/PPP2PP1/1K1R4 w - - 1 0 KQkq - 0 1"] [NAVIGATION "0"] [CUSTOM_MOVE "1"] 1.Rdxd5 Rxd5 2.Rxd5 Qd6 3. Qxd6 Bxd5 4.Qe7#