The ideas are: d3 uncovers an attack on b2. But this is not such a great plan, as for a pawn black will have to handle white's Ra1 chasing her. e2 is pinned, but whie can play e3, after which d3 must be defended. White must free himself while he can. He has no time for anything that handle the following attack, activate quickly his pieces, etc. Nf3 is almost forced here, welcoming Qa5+? Qd2. But black is still winning here, IMO.

Obviously white saw d3, and still he thought he had defence against it (e3). At the same time, the B will guard white against a future ...Nf3 from black. And if ...Nc2 is threatened, then Rc1 should be enough... Now, black can be tempted to use the Q to avoid the fianchetto, but if Qd5, Nd2 can move to f3, allowing the WQ to defend d3. This is the main reason because black plays NOW d3: he has no senible way to prevent white to unravel a little bit his position by playing Nf3.

Only alternate move could have been Bg4, with the idea to take the N if it comes to f3. But white can harass the B with h3 (etc), then the best plan is to push the pawn while you can. (But you still have to check for white's improvements!)

I don't think 15.e3 is very comfortable, neither, after 15...Qd5. But the text loses out of hand.

What's wrong with 15. Nf3...? Qd5, ...Qxd3.

Wow, Nc2+ is the worst threat. White must think about Rc1, acceting the exchange, or f4!?, with the idea to escape via f2 (but after Qe3...)

Even 16.Rc1 won't save him. Black would not have won the exchange by 16...Nc2ch, but a whole piece by 16.Rc1 dxe2 17.Bxe2 Re8 18.Rc3 (say) Qxe2ch 19.Qxe2 Rxe2ch 20.Kd1 ... (20.Kf1 Bh3ch mates quickly) 20...Bg4, with an easy win.

Very one-sided sort of game! This sort of opening can be very tricky for White to play. Here's something similar, though I actually butchered the killer blow and had to take the scenic route to the win. game

Id like to take the opportunity to say a very big thank you to Charles for annotating this game, its been a great insight to read the analysis. Thanks also for all the comments which have been great to read. I did not realise this section was available. Once again many thanks Charles its very much appreciated. Willy............

Many thanks for your kind words Joe, Willy and many thanks to everyone for their comments!