Queen retreats on the diagonal

White to play. Decide for 77.Qd3+ or 77.Qh3+
Solution
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1.e4 d6 2.d4 Nf6 3.Nc3 e5 4.Nf3 Nbd7 5.Bc4 Be7 6.0-0 0-0 7.Re1 c6 8.a4 a5 9.Bg5 Qc7 10.Qd2 Nb6 11.Bb3 Bg4 12.dxe5 dxe5 13.Qe3 Nbd7 14.Nh4 Nc5 15.Bc4 Ne6 16.h3 Nxg5 17.Qxg5 Be6 18.Nf5 Bxf5 19.Qxf5 g6 20.Qf3 Kg7 21.Red1 Nh5 22.g3 Bc5 23.Rd2 Rad8 24.Rad1 Rxd2 25.Rxd2 Bd4 26.Nd1 f5 27.exf5 Rxf5 28.Qg2 Qe7 29.c3 Bc5 30.h4 e4 31.Re2 Qd6 32.Ne3 Rf3 33.Nf1 Nxg3 34.Rd2 Qf4 35.Rd7+ Kh6 36.Bg8 Ne2+ 37.Kh1 Qxh4+ 38.Nh2 Be7 39.Rxe7 Qxe7 40.Nxf3 exf3 41.Qxf3 Qh4+ 42.Kg2 Nf4+ 43.Kg1 g5 44.Bb3 Qh5 45.Qe4 Qe2 46.Qd4 Qf3 47.Qf6+ Kh5 48.Qf7+ Kg4 49.Be6+ Nxe6 50.Qxe6+ Qf5 51.Qe2+ Kh4 52.Qe7 b5 53.Qd6 Qb1+ 54.Kh2 Qe4 55.Qh6+ Kg4 56.Qh3+ Kf4 57.axb5 cxb5 58.Qg3+ Kf5 59.Qh3+ Ke5 60.Qd7 Qh4+ 61.Kg1 b4 62.Qb5+ Kf6 63.Qb6+ Kg7 64.Qxa5 bxc3 65.Qxc3+ Kg6 66.Qd3+ Kf6 67.Qd6+ Kf5 68.b4 Qg4+ 69.Kf1 Qc4+ 70.Kg2 Qe4+ 71.Kf1 Qb1+ 72.Ke2 Qe4+ 73.Kd2 Kg4 74.b5 h5 75.b6 h4 76.Qd7+ Kf3 77.Qd3+! 77.b7? Qb4+ 78.Kc2 Qc4+ 79.Kb2 Qb4+ 80.Ka2 g4 81.Qc7 Qa4+ 82.Kb2 Qb4+ 83.Kc2 Qe4+ 84.Kb3 Qb1+ 85.Ka4 Qa2+ 86.Kb5 Qb3+ 87.Ka6 Qd3+ 88.Ka7 Qa3+ 89.Kb8 g3 90.fxg3 hxg3= 77.Qh3+? Kxf2 78.Qh2+ Kf1 79.Qh3+ Kf2= 77...Qxd3+ 78.Kxd3 Kxf2 78...h3 79.b7 h2 80.b8Q h1Q 80...Kg2 81.Qg3+ Kh1 82.f3 g4 83.Qf2 gxf3 84.Qf1# 81.Qg3# 81.Qa8+ Kxf2 82.Qxh1+- 79.b7 g4 80.b8Q g3 81.Qf4+ Kg1 82.Qxh4 g2 83.Ke3 83.Ke3 Kf1 84.Qf2# 1–0
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Purtov,K | 2199 | Fokin,A | 1817 | 1–0 |
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