Tuesday, April 19, 2011

Diemer-Duhm (continued)

I got an interesting mail from an attentive reader on my previous post, questioning the correctness of the position after 13.Qf2 in my previous post. Let's look at the alternatives

a/ 13...Kxh7 14.Ng5+ Kg6 15.Qg3 improves on my previous post, but black cannot hope for more than equality, eg

a1/ 15...Qa5 16.Ne4+ Kh7 17.Nf6+ gxf6 18.Qh4+ draw
a2/ 15...Ne4 16.Nxe4+ Kh7 17.00 with white advantage
a3/ 15...Re8 16.Nxe6+ Kf6 17.Bg5+ Kxe6 18.Bxd8 Kd7+ 19.Kf1 with complicated play
a4/ 15...Kf6 16.Nh7+ Ke7 17.Qxg7 followed by
a41/ 17...Kd6 18.Bg5 f6 19.Nxf6 with small white advantage
a42/ 17...Ne4 18.00 with white advantage

b/ 13...g6 14.Ng5 Kg7 (forced) 15.00

b1/ 15...f5 16.Qh4 followed by
b11/ 16...Ne2+ 17.Kh1 Nxc1 18.Rf3!! with white advantage
b12/ 16...Rf6 17.Rf3 with white advantage
b13/ 16...Qf6 17.Nxe6+ with white winning

c/ 13...d3 14.Ng5 with a very difficult position

14...f6 All other moves loose quickly 15.00 and black's only chance consists of the odd looking 15...Nd1 16.Rxd1 fxg5 17.Rxd3 Nd7 18.Qc2 with equal game.

d/ 13...Nd7 14.00 with an equal position

e/ 13...Nc6 14.Ng5 f6 15.Qh4 fxg5 16.Qh5 Rf6 17.Bg6+ Kg8 18.Bxg5 with white advantage

There are sure other moves to be considered, such as 13...e5, but I guess you 've got the idea - there are different openings than the Blackmar Diemer that result in aggresive kingside attacks, But then again, they are closely related as they often have the same ideas in common.

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