London System Trap

Tony Preece (1645/144) - Spanton (1900/171)
22nd 4NCL Telford U2000 Round 3
New London
1.d4 d5 2.Bf4
One of the points of the New London (1.d4 and 2.Bf4) as opposed to the old London System (1.d4, 2.Nf3 and 3.Bf4) is that it discourages Chigorin fanatics from playing 2...Nc6. In the traditional London System, Black can play a Pseudo-Chigorin, ie 1.d4 d5 2.Nf3 Nc6 3.Bf4 Bg4. However, in the New London White can meet 1.d4 d5 2.Bf4 Nc6 with 3.e3, when 3...Bg4 is not possible. Some strong players, for example Morozevich and Sokolov, have insisted on playing against the New London in a sort of Chigroin-style with 2...Bg4!?
2...e6 3.Nf3 Bd6 4.Bg3 Nf6 5.e3
The most-popular move in ChessBase's 2019 Mega database.
5...Ne4!?
Attempting to show that White's move-order is incorrect.
6.Bh4
Preserving the bishop-pair, at least for the moment. The analysis engines Stockfish10 and Komodo9 reckon White should get on with normal development, the point being that Black's gain of the bishop-pair will cost time and will half-open the h file.
6...Be7
6...g5!?
7.Bxe7 Qxe7
The result of these manoeuvres is that White, rather than Black, is behind in development, but Black has not gained the bishop-pair, and White has the better remaining bishop.
The engines reckon White is slightly better. I am not sure about that, but it proved a moot point as my opponent missed a key feature of the position.
8.Ne5? Qb4+ 9.Nd2
The only move.
9...Nxd2 10.Qxd2 Qxb2 (0-1, 61 moves)