1.d4
Nf6
2.c4
e6
3.Nc3
Bb4
The Nimo-Indian Defense. Idea to prevent e2-e4
4.e3
Idea Nge2 to avoid doubled pawns after Bxc3
4...c5
5.Nge2
cxd4
6.exd4
d5
Giving white a choice between an immediate a3 or c4-c5 first.
7.a3
Be7
Preserving the dark-squared bishop
8.c5
White has chances now with a three-on-two queenside majority. Black has counter-play in the center
8...b6
Actively challenging the majority.
9.b4
a5
threat axb5
10.Na4
Permiting the recapture with axb5 and also pressuring the b6-pawn
10...bxc5
11.dxc5
axb4
12.axb4
So, the question is, are the connected pawns strong or targets?
12...Nc6
Attacking the backward b4-pawn.
13.Bd2
Protecting the b4-pawn, but dangerous. Note that the white king cannot move! All black needs is check! [13.b5
Qa5+
14.Nec3
d4~~
]
13...Ne4!
14.Nb6
Diagram Looks good for white. The threats are Rxa8 and Nxa8. But it's actually black to move and win, and there may be four ways to do it!
14...Bxc5!
Threatening Bxf2 mate [14...Nxf2
15.Kxf2
Bh4+
16.Ng3
Qf6+
17.Qf3
Qxa1
18.Nxa8
Qxa8-/+
; 14...Bh4-+
; 14...Nxb4
15.Bxb4
Qxb6
16.cxb6
Bxb4+-+
]
15.bxc5
Qf6
With two threats, Qxf2 mate and Rxa1 -+ 0-1