Thursday, June 26, 2014

A simple trap in the lemberger countergambit

This morning I enjoyed a simple victory in the Lemberger.
1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4 exd4 5.Bb5+ c6 6.Qe2 (diagram)

My opponent played the second best move here : 6...Be6 7.Bc4
And now fell for the simple trap 7...Bxc4 8.Bf6#

Surely it was just a blitz game, but I have won the same trap in a normal over the board game against an opponent rated fide 1750, so it is \surely not as simple as it seems. Let's look at the possibility starting from move 6.

a. 6...Be6 7.Bc4 (diagram)
...a1/ 7...Bb4+ 8.Bd2
......a1a/ 8....Bxd2+ 9.Nxd2 (+=)
......a1b/ 8....Bxc4 9.Nf6+ Kf8 10.Bxb4+ Ne7 11.Qxc4 (+)
......a1c/ 8....Qe7 9.0-0-0 Bxd2+ 10.Rxd2 (+)
......a1d/ 8....d3 9.cxd3 (+=)
...a2/ 7...Bd6 8.Bxe6 fxe6 9.Qg4 (+)
...a3/ 7...Be7 8.Bxe6 fxe6 9.Nf3 (+=)
...a4/ 7...Nf6 8.Ng5 (+=)
...a5/ 7...Na6 8.Bxe6 fxe6 9.Nf3 (+=)

b. 6...Be7 7.Bc4 (diagram)
...b1/ 7...Bf5 8.Nf3 (=)
...b2/ 7...Be6 8.Bxe6 fxe6 9.Nf3 (+=)
...b3/ 7...b5 8.Bd3 (+=)
...b4/ 7...Nf6 8.Nxf6+ gxf6 9.Qh5 (+=)

c/ 6...Qe7 7.Nd6+ Kd8 8.Qxe7 Kxe7 9.Nxc8+ Kd7 10.Bc4 (+=)

d/ 6...Bb4+ 7.c3 ( there are better ways for white, but this one is the only ones that maintains some winning chances for white ) (diagram)
...d1/ 7...cxb5 8.cxb4 
......d1a/ 8...Ne7 9.Qxb5+ (-)
......d1b/ 8...Nc6 9.Bf4 (=)
......d1c/ 8...a6 9.Bf4 (+=)
......d1d/ 8...Qe7 9.Nd6+ (+=)
......d1e/ 8...Bd7 9.Bg5 (+)
......d1f/ 8...Be6 9.Qxb5+ Nc6 10.Bf4 (=)
...d2/ 7...dxc3 8.bxc3 (=)
...d3/ 7...Be7 8.Bc4 (+=)
...d4/ 7...Ne7 8.Bd3 (=)
...d4/ 7...Qe7 8.cxb4 cxb4 9.Nd6+ (+=)

So we see that the gambit has many traps that may lead so a quick win, but it is not really correct, as it can be refuted, but white is no material down and can still fight back after 6...Bb4+ 7.c3 cxb5 8.cxb4 Ne7 9.Qxb5+ Nbc6 10.Ne2 (diagram)



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