Thom Christensen of Denmark faces a tough blitz challenge when FM Gerson Principe of Peru declines the Blackmar-Diemer Gambit. This Langeheinecke Variation began 1.d4 Nf6 2.Nc3 d5 3.e4 dxe4 4.f3 e3. Black returns the pawn with the plan of outplaying his opponent. Eventually, Black won the Exchange, but White gained compensation with passed pawns. White could not make progress until he threatened to mate his opponent.
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Christensen (2154) – Principe (2230), Titled Tuesday chess.com INT, 22.06.2021 begins
1.d4 Nf6 2.Nc3 d5 3.e4 dxe4 4.f3 e3 5.Bxe3 e6 6.Bd3 Be7 7.Nge2 0–0 8.0–0 Nbd7 9.Ng3 c5 10.Nce4 cxd4 11.Bxd4 b6 12.Bc3 Bb7 13.Qe2 Nc5 14.Nxc5 Bxc5+ 15.Kh1 Be7 [15...Nd5!?=]
16.Rad1 Qb8 17.Be5 Qc8 18.Ne4 Nd5 19.Nd6 Bxd6 20.Bxd6 Rd8 21.Bg3 Nb4 22.c3? [White could play 22.Bh4 with a good position.]
22...Nxd3 23.Rxd3 Rxd3 24.Qxd3 Ba6 [This bishop skewer wins the Exchange for Black.]
25.Qd1 Bxf1 26.Qxf1 Qd7 27.h3 Rd8 28.Qa6 f6 29.Kh2 e5 30.a4 Qe7 31.a5 bxa5 32.Qxa5 Re8 [32...Rd2 33.Qb5 Qd7-+]
33.Bf2 f5 34.Bc5 Qf7 35.Qxa7 Qd5 [Black probably converts the advantage after 35...Qxa7 36.Bxa7 Ra8-+]
36.b4 e4 37.fxe4 fxe4[White makes a threat that gets missed in blitz.] 38.Bd4 e3 [Better is 38...Qf7 39.Qc5 Qf4+ 40.Kg1 e3 41.Qc4+ Qf7 42.Qe2=] 39.Qxg7# [Black is checkmated] 1–0
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