user12322: I won the game easily because my opponent left a rook hanging in the end. I believe I missed opportunities to build a stronger attack, but I am not sure how I could have done so.
[FEN ""]
1.d4 e5 2.dxe5 Qe7 3.Nc3 Qxe5 4.e4 Nf6 5.Nf3 Qe7 6.Bd3 Qb4 7.O-O Be7 8.e5 Ng4 9.Nd5 Qc5 10.Nxe7 Qxe7 11.Re1 O-O 12.h3 Nh6 13.Nd4 Qh4 14.Re4 Qe7 15.Bxh6 gxh6 16.Qh5 d5 17.Re3 f5 18.Rg3+ Kh8 19.f4 Nc6 20.Nxc6 bxc6 21.Qxh6 Qe6 22.Qxf8+ Qg8 23.Qxg8#


user10607: You could have started with a tempo with:

Nf3 Qe7
Nd5

which threatens Nxc7+ and winning a rook. Continuing with Black's best response:

... Qd8
Bf4 d6

Bf4 adds an attacker to the c7 pawn so d7 is forced. After this has happened, we are left with:
[FEN ""]
1. d4 e5 2.dxe5 Qe7 3. Nc3 Qxe5 4. Nf3 Qe7 5. Nd5 Qd8 6. Bf4 d6

Black wasted 6 moves basically to trade a pawn and advance the d pawn, which was forced. White however, has developed both Knights and a Bishop. White's development will continue with e4, posting the strong d5 Knight. If Black plays Nf6, then White further develops with Bc4.
[FEN ""]
1. d4 e5 2.dxe5 Qe7 3. Nc3 Qxe5 4. Nf3 Qe7 5. Nd5 Qd8 6. Bf4 d6 7. e4 Nf6 8. Bc4

Note that Black did not capture White's e4 pawn because though undefended, Black will lose the Knight to a pin with Qe2. If Black tries to defend with f5:
[FEN ""]
1. d4 e5 2.dxe5 Qe7 3. Nc3 Qxe5 4. Nf3 Qe7 5. Nd5 Qd8 6. Bf4 d6 7. e4 Nf6 8. Bc4 Nxe4 9. Qe2 f5 10. Bg5 Qd7 11. Nd2 Be7 12. Bxe7 c6 13. Nxe4 fxe4 14. Qh5+ g6 15. Nf6+ Kxe7 16. Qg5 Qd8 17. O-O-O Bf5 18. Nxe4+ Kd7 19. Rxd6+

and the Queen is lost as the King can no longer block the Rook from attacking the Queen.

In eight moves (board 2), White has created a tempo, developed all minor pieces, has strong command of the center, and caused Black to be severely underdeveloped. White also has the option to castle King's side and Queen's side if the Queen moves. If Black does blunder (board 3), White's superior position will easily win the game with the right attacks.
Though I agree that the midgame moves are improvements, I believe a strong position and attack in the beginning is much, much better. 

user12449: 
[fen ""]

[White "?"]
[Black "?"]
[Result "1-0"]

1. d4 e5 2. dxe5 Qe7 3. Nc3 Qxe5 4. e4 Nf6 5. Nf3 Qe7 6. Bd3 {Bc4 looks more
active, but the e pawn is under pressure.  e5 followed by Bc4 seems best.} 6...
Qb4 7. O-O Be7 8. e5 Ng4 9. Nd5 Qc5 10. Nxe7 {This exchanges too quickly.} (10.
c4) 10... Qxe7 11. Re1 {The pawn is protected by the pin on the e file.} (11. h3
Nh6 12. Bxh6 (12. Bg5)) 11... O-O 12. h3 (12. Bxh7+) (12. Bg5) 12... Nh6 13. Nd4
Qh4 14. Re4 {The knight's not under attack, but this or Bxh6 is the best move.}
14... Qe7 15. Bxh6 gxh6 16. Qh5 (16. Nf5) 16... d5 17. Re3 (17. exd6 Qxd6 18.
Nf5 Bxf5 19. Qxf5 {Threatening Rg4+ and Qxh7#}) 17... f5 18. Rg3+ Kh8 19. f4 Nc6
20. Nxc6 bxc6 21. Qxh6 Qe6 22. Qxf8+ Qg8 23. Qxg8# *


The game was well played.  You need to open more lines, create more weaknesses, and practice more tactics.

user11202: exd6/exf6 as mentioned above are good just because they open lines and the pawn isn't likely to anchor the knight.
I really like 17. Rh4 because it forces Qg5, then Qxh6 gets both h pawns and the game's pretty much over.
Black has a resource of ...Qg5 to try to trade queens, but White's so far ahead in development it isn't a real threat to dissipate his advantage.
19 Nxf5 seems fine too as Qf7 (or) Qxe5 Qxh6 and ...Qf5 allows Qg7 mate, so White is just a pawn up and has opened up Black's kingside a bit more.
Sometimes it's easy to overthink stuff and not go for the clear captures. And a move like f4 appears to build up your position, but the e-pawn doesn't need protection. Open lines are important.
20 Nxc6 seems to let Black off the hook too. You should avoid piece exchanges while you're ahead unless they lead to a clear endgame. Yeah, you mess up his queenside pawns a bit, but you need to think bigger. It's nice to win a pawn, but as opposed to the line above, which also wins a pawn, the game is a bit closed off.
A good way to continue the attack after ...Be6 instead of Qe6 looks to be Rg3-g5-h5 and Kh2 and Rg1 and g4. White will break through on the g-file. Black will have trouble exchanging queens since the queen has to guard the bishop, and if that moves, Qxc6 works. Meanwhile White brings his rook into the game, either with Ra1-e1-e3-g3 or Kh2, Rg1, g4.

user11629: 
Nf5 would win the queen one way or another because of the threat Qg4+, Qg7++. For instance 16. Nf5 Qe6 17. Qg4+ Qg6 18. Ne7+

Other than that, when you are attacking and the opponent's pieces are undeveloped or discoordinated you really want to open files and not create a closed position. Therefore 17. exd6 e.p. or even better 18. exf6 e.p. seems natural. Then white will bring a rook to e7 and black should be lost soon.

12322: <p>I won the game easily because my opponent left a rook hanging in the end. I believe I missed opportunities to build a stronger attack, but I am not sure how I could have done so.</p>

<pre><code>[FEN ""]
1.d4 e5 2.dxe5 Qe7 3.Nc3 Qxe5 4.e4 Nf6 5.Nf3 Qe7 6.Bd3 Qb4 7.O-O Be7 8.e5 Ng4 9.Nd5 Qc5 10.Nxe7 Qxe7 11.Re1 O-O 12.h3 Nh6 13.Nd4 Qh4 14.Re4 Qe7 15.Bxh6 gxh6 16.Qh5 d5 17.Re3 f5 18.Rg3+ Kh8 19.f4 Nc6 20.Nxc6 bxc6 21.Qxh6 Qe6 22.Qxf8+ Qg8 23.Qxg8#
</code></pre>
 10607: <p>You could have started with a tempo with:</p>

<ol start="4">
<li>Nf3 Qe7</li>
<li>Nd5</li>
</ol>

<p>which threatens Nxc7+ and winning a rook. Continuing with Black's best response:</p>

<ol start="5">
<li>... Qd8</li>
<li>Bf4 d6</li>
</ol>

<p>Bf4 adds an attacker to the c7 pawn so d7 is forced. After this has happened, we are left with:</p>

<pre><code>[FEN ""]
1. d4 e5 2.dxe5 Qe7 3. Nc3 Qxe5 4. Nf3 Qe7 5. Nd5 Qd8 6. Bf4 d6
</code></pre>

<p>Black wasted 6 moves basically to trade a pawn and advance the d pawn, which was forced. White however, has developed both Knights and a Bishop. White's development will continue with e4, posting the strong d5 Knight. If Black plays Nf6, then White further develops with Bc4.</p>

<pre><code>[FEN ""]
1. d4 e5 2.dxe5 Qe7 3. Nc3 Qxe5 4. Nf3 Qe7 5. Nd5 Qd8 6. Bf4 d6 7. e4 Nf6 8. Bc4
</code></pre>

<p>Note that Black did not capture White's e4 pawn because though undefended, Black will lose the Knight to a pin with Qe2. If Black tries to defend with f5:</p>

<pre><code>[FEN ""]
1. d4 e5 2.dxe5 Qe7 3. Nc3 Qxe5 4. Nf3 Qe7 5. Nd5 Qd8 6. Bf4 d6 7. e4 Nf6 8. Bc4 Nxe4 9. Qe2 f5 10. Bg5 Qd7 11. Nd2 Be7 12. Bxe7 c6 13. Nxe4 fxe4 14. Qh5+ g6 15. Nf6+ Kxe7 16. Qg5 Qd8 17. O-O-O Bf5 18. Nxe4+ Kd7 19. Rxd6+
</code></pre>

<p>and the Queen is lost as the King can no longer block the Rook from attacking the Queen.</p>

<hr>

<p>In eight moves (board 2), White has created a tempo, developed all minor pieces, has strong command of the center, and caused Black to be severely underdeveloped. White also has the option to castle King's side and Queen's side if the Queen moves. If Black does blunder (board 3), White's superior position will easily win the game with the right attacks.</p>

<p>Though I agree that the midgame moves are improvements, I believe a strong position and attack in the <em>beginning</em> is much, much better. </p>
 12449: <pre><code>
[fen ""]

[White "?"]
[Black "?"]
[Result "1-0"]

1. d4 e5 2. dxe5 Qe7 3. Nc3 Qxe5 4. e4 Nf6 5. Nf3 Qe7 6. Bd3 {Bc4 looks more
active, but the e pawn is under pressure.  e5 followed by Bc4 seems best.} 6...
Qb4 7. O-O Be7 8. e5 Ng4 9. Nd5 Qc5 10. Nxe7 {This exchanges too quickly.} (10.
c4) 10... Qxe7 11. Re1 {The pawn is protected by the pin on the e file.} (11. h3
Nh6 12. Bxh6 (12. Bg5)) 11... O-O 12. h3 (12. Bxh7+) (12. Bg5) 12... Nh6 13. Nd4
Qh4 14. Re4 {The knight's not under attack, but this or Bxh6 is the best move.}
14... Qe7 15. Bxh6 gxh6 16. Qh5 (16. Nf5) 16... d5 17. Re3 (17. exd6 Qxd6 18.
Nf5 Bxf5 19. Qxf5 {Threatening Rg4+ and Qxh7#}) 17... f5 18. Rg3+ Kh8 19. f4 Nc6
20. Nxc6 bxc6 21. Qxh6 Qe6 22. Qxf8+ Qg8 23. Qxg8# *

</code></pre>

<p>The game was well played.  You need to open more lines, create more weaknesses, and practice more tactics.</p>
 11202: <p>exd6/exf6 as mentioned above are good just because they open lines and the pawn isn't likely to anchor the knight.</p>

<p>I really like 17. Rh4 because it forces Qg5, then Qxh6 gets both h pawns and the game's pretty much over.</p>

<p>Black has a resource of ...Qg5 to try to trade queens, but White's so far ahead in development it isn't a real threat to dissipate his advantage.</p>

<p>19 Nxf5 seems fine too as Qf7 (or) Qxe5 Qxh6 and ...Qf5 allows Qg7 mate, so White is just a pawn up and has opened up Black's kingside a bit more.</p>

<p>Sometimes it's easy to overthink stuff and not go for the clear captures. And a move like f4 appears to build up your position, but the e-pawn doesn't need protection. Open lines are important.</p>

<p>20 Nxc6 seems to let Black off the hook too. You should avoid piece exchanges while you're ahead unless they lead to a clear endgame. Yeah, you mess up his queenside pawns a bit, but you need to think bigger. It's nice to win a pawn, but as opposed to the line above, which also wins a pawn, the game is a bit closed off.</p>

<p>A good way to continue the attack after ...Be6 instead of Qe6 looks to be Rg3-g5-h5 and Kh2 and Rg1 and g4. White will break through on the g-file. Black will have trouble exchanging queens since the queen has to guard the bishop, and if that moves, Qxc6 works. Meanwhile White brings his rook into the game, either with Ra1-e1-e3-g3 or Kh2, Rg1, g4.</p>
 11629: <ol start="16">
<li>Nf5 would win the queen one way or another because of the threat Qg4+, Qg7++. For instance 16. Nf5 Qe6 17. Qg4+ Qg6 18. Ne7+</li>
</ol>

<p>Other than that, when you are attacking and the opponent's pieces are undeveloped or discoordinated you really want to open files and not create a closed position. Therefore 17. exd6 e.p. or even better 18. exf6 e.p. seems natural. Then white will bring a rook to e7 and black should be lost soon.</p>
