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Passive Q sacrifice leading to mate.
1…dxc3 2.f3
(2.f4 cxb2+ 3.Qxa5 bxa1=Q+ 4.Kf2 Qd4+ 5.Kg3 Qe3+ 6.Kxg4 Qxf4+ 7.Kh3 Qh4#)
(2.Qxa5 Bd2#)
(2.Qxg5 cxb2+ 3.Qxa5 bxa1=Q+ 4.Kd2 Qd4+ 5.Bd3 Qxf2+ 6.Be2 Qxe2#)
2…cxb2+
3.Qxa5 bxa1=Q+
4.Kf2
(4.Ke2 Rc2+ 5.Kd3 Qd1+ 6.Qd2 Qxd2#)
4…Bh4+ 5.Ke3
(5.g3 Qd4+ 6.Kg2 Rc2+)
5…Qc1+ 6.Qd2<
(6.Ke2 Rc2+ 7.Kd3 Be6 8.g3 Bc4+ 9.Kd4 Bf6+ 10.e5 Bxe5+ 11.Qxe5 Qa1+ 12.Ke3 Qxe5#)
6…Bg5+
7.f4 Rc3+
8.Bd3 Bxf4+
9.Kxf4 Qxd2+
10.Kxg4 Rxd3 and wins huge material.