Blackmar-Diemer Gambit 4...e3

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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Herrstrom Gambit Zilbermints

Lev Zilbermints enjoys surprising opponents with offbeat or unorthodox gambits. In the Zukertort Opening Herrstrom Gambit, White took the surprise gambit pawn on move two. Then Lev moves a second pawn (all eyes on the pawn) while at the same time attacking a knight with the queen (no eyes on the queen). Knowing one should play an early e4 or d4, White chose the wrong one this time. Winning material in blitz doesn’t immediately win. One still must play well. Black does in this game. Based on his experience Lev Zilbermints said, “People do not expect the Herrstrom to be better than its reputation.”

My Checkmate Tactics book has the best 500 chess opening mates.

My Combination Tactics book has the best 500 ways to win material.

Peter333 (2307) – Zilbermints (2370), Rated Blitz game lichess.org, 06.09.2021 begins 1.Nf3 g5 2.Nxg5 e5

3.e4 [White blunders a piece. Much stronger is 3.d4 usually retreating the knight to f3 next move and followed by a general consolidation to win with the extra pawn. That's easier said than done vs a strong blitz opponent familiar with the opening.] 3...Qxg5 [Black has won a knight.] 4.d4 Qg7 5.dxe5 Qxe5 6.Nc3 Bb4 7.f4 Bxc3+ 8.bxc3 Qxe4+ 9.Kf2 Ne7 10.Bd3 Qa4 11.Re1 Nbc6 12.Qh5 d6 13.Re4 Qa5 14.Qh6 [If 14.Qxa5 Nxa5 White has nothing for the lost piece.] 14...Bf5 15.Qf6 0–0–0 16.Rxe7 Nxe7 17.Qxe7 Bxd3 18.cxd3 [Or 18.Qe1 Rhe8 19.Be3 Bxc2 20.Qd2 Be4 and Black is up a rook.] 18...Qxc3 [White resigns.] 0–1

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