**Jyrki Heikkinen — David Bye**, e-mail, 2005

**1.d4 d5 2.e4 e6 3.c4 dxe4 4.Nc3 Nf6 5.f3 exf3 6.Nxf3 Nbd7 7.Bd3 Be7 8.O-O O-O 9.Bg5 Ne8**

A pretty standard DDG, but Black plays too passively.

**10.Be3**

The first "creative" bishop move. I didn't want to ease Black's cramped position by exchanging pieces.

**10...g6 11.Qe1 Ng7 12.Rd1 f5? 13.Bh6**

This bishop again. I expected Black to play f4, which would block the bishop away from the kingside.

**13...Nf6 14.Bg5**

The bishop maneuver g5-e3-h6-g5 looks like a novice moving a piece back and forth without a plan. I did feel myself a bit stupid after returning to g5, but now that Black has weakened dark squares with g6, I'm willing to exchange the dark bishops.

**14...Re8 15.Bc2 c6 16.Ne5 Nfh5 17.Bxe7 Qxe7**

**18.Qe3 Bd7 19.Qh6 Rad8 20.c5**

Funny that Black did not have time to play c5. I was expecting it several times. Black would have gained more space for his pieces by breaking White's center.

I wanted to play 20.Be4 fxe4 21.Rf7 Qxf7 22.Nxf7 Kxf7 23.Nxe4, which is good for White. But I didn't play 20.Be4 because it threatens nothing, and Black could play, say, 20...Qb4. Post-mortem analysis showed that 22...Nf5! ruins my variation above.

**20...g5?**

This move must be dubious, was my first impression. I tried to look at the position like an outsider, and asked myself: What is White's compensation for the pawn?

The answer is mobility. I evaluated the **mobility** of the troops by counting the **number of sensible moves of each piece**. I came up with the numbers 22/11, that is, White's pieces have altogether twice as many sensible moves as Black's pieces.

Rybka suggests 20...Nf6 =.

**21.Ne4!**

This changes "mobility numbers" to 24/9. Finding this decisive move was easy, thanks to my analysis of the move 20.Be4.

**21...fxe4 22.Rf7 Qxf7 23.Nxf7 Kxf7 24.Rf1+** 1-0

Game over: 24...Nf4 25.Qxg5 or 24...Kg8 25.Bxe4 or 24...Ke7 25.Qxg5+.