This was a game I played in the Yorkshire intercity league, The Woodhouse Cup. I was Black in the London System and managed to gain the bishop pair and a better pawn structure on move 4. This gave me an advantage which I soon lost. A common feature in these Q pawn positions is the Queen face off on b3 and b6. As Nigel says “Normally there’s a battle in such positions to get the other guy to capture on b3 or b6.” I thought it was okay to swap off but I misjudged the advantage the half open file could give White for example with the line 9.dxc5 Bxc5 10.b4. As it was Black’s position is cramped and difficult to play but White blundered with 19.Ra8.