White’s move 3.Be3!? is a gambit with two options. One is Alapin's approach of 3…dxe4 4.Nd2 Nf6 5.c3 Nbd7 6.Qc2 which he played in 1897. Second is the Alapin-Diemer 4.Nd2 Nf6 5.f3 exf3 6.Ngxf3. Normand played 4.Nc3 and continued in the style of E.J. Diemer with 5.f3. White sacrificed material and the kingside attack led to a forced win in the game between Nicolas Normand and TimiNeutron.
My Blackmar-Diemer Tactics has 500 combinations and mates.
My Checkmate Tactics book has my favorite 500 opening checkmates.
My Combination Tactics book has my favorite 500 ways to win material.
Normand (1622) – TimiNeutron (1859), Rated Blitz game lichess.org, 13.03.2021 begins 1.d4 e6 2.e4 d5 3.Be3 [French Alapin Gambit] 3...dxe4 4.Nc3 [4.Nd2 avoids issues with Black's ...Bb4.] 4...Nf6 5.f3 exf3 [5...Bb4=+] 6.Qxf3 Nc6 7.Bd3 Bb4 8.Nge2 Bd7 9.0–0 0–0 10.Qh3 e5 11.Qh4 exd4 12.Rxf6 g6 13.Bg5!? [13.Nxd4+/-] 13...Be7 [13...dxc3 14.Rxc6!+-] 14.Ne4 Bf5
15.Rf1 [15.Rxf5! gxf5 16.Nf6+ Bxf6 17.Bxf6+-] 15...Bxe4 16.Bxe4 Bxf6 17.Bxf6 [Black resigns.] 1–0