3 added 95 characters in body
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After 4. dxe5 dxe5 5. Qxd8+ Kxd8, Black has several advantages he does not normally have:

  1. He has an e pawn against a c pawn, meaning the better center pawn structure.
  2. BOTH of his bishop's diagonals are free and clear.
  3. He can "castle by hand" after c6 by Kc7 (and from there to b8 if desired). On the other hand, he has the option of leaving his king in the center if that is more advantageous (if one or two pairs of pieces are quickcyquickly exchanged).The fact that the queens are off the board means that most of the danger to the king is past.
  4. White hasn't developed any king side pieces, so it will be a while before he can castle, at least on the king side.

Given all the above facts, Black is not at a disadvantage.

After 4. dxe5 dxe5 5. Qxd8+ Kxd8, Black has several advantages he does not normally have:

  1. He has an e pawn against a c pawn, meaning the better center pawn structure.
  2. BOTH of his bishop's diagonals are free and clear.
  3. He can "castle by hand" after c6 by Kc7 (and from there to b8 if desired). On the other hand, he has the option of leaving his king in the center if that is more advantageous (if one or two pairs of pieces are quickcy exchanged).
  4. White hasn't developed any king side pieces, so it will be a while before he can castle, at least on the king side.

Given all the above facts, Black is not at a disadvantage.

After 4. dxe5 dxe5 5. Qxd8+ Kxd8, Black has several advantages he does not normally have:

  1. He has an e pawn against a c pawn, meaning the better center pawn structure.
  2. BOTH of his bishop's diagonals are free and clear.
  3. He can "castle by hand" after c6 by Kc7 (and from there to b8 if desired). On the other hand, he has the option of leaving his king in the center if that is more advantageous (if one or two pairs of pieces are quickly exchanged).The fact that the queens are off the board means that most of the danger to the king is past.
  4. White hasn't developed any king side pieces, so it will be a while before he can castle, at least on the king side.

Given all the above facts, Black is not at a disadvantage.

2 Separated conclusion from premises
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After 4. dxe5 dxe5 5. Qxd8+ Kxd8, Black has several advantages he does not normally have:

  1. He has an e pawn against a c pawn, meaning the better center pawn structure.
  2. BOTH of his bishop's diagonals are free and clear.
  3. He can "castle by hand" after c6 by Kc7 (and from there to b8 if desired). On the other hand, he has the option of leaving his king in the center if that is more advantageous (if one or two pairs of pieces are quickcy exchanged).
  4. White hasn't developed any king side pieces, so it will be a while before he can castle, at least on the king side. Given this fact, Black is not at a disadvantage.

Given all the above facts, Black is not at a disadvantage.

After 4. dxe5 dxe5 5. Qxd8+ Kxd8, Black has several advantages he does not normally have:

  1. He has an e pawn against a c pawn, meaning the better center pawn structure.
  2. BOTH of his bishop's diagonals are free and clear.
  3. He can "castle by hand" after c6 by Kc7 (and from there to b8 if desired).
  4. White hasn't developed any king side pieces, so it will be a while before he can castle, at least on the king side. Given this fact, Black is not at a disadvantage.

After 4. dxe5 dxe5 5. Qxd8+ Kxd8, Black has several advantages he does not normally have:

  1. He has an e pawn against a c pawn, meaning the better center pawn structure.
  2. BOTH of his bishop's diagonals are free and clear.
  3. He can "castle by hand" after c6 by Kc7 (and from there to b8 if desired). On the other hand, he has the option of leaving his king in the center if that is more advantageous (if one or two pairs of pieces are quickcy exchanged).
  4. White hasn't developed any king side pieces, so it will be a while before he can castle, at least on the king side.

Given all the above facts, Black is not at a disadvantage.

1
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After 4. dxe5 dxe5 5. Qxd8+ Kxd8, Black has several advantages he does not normally have:

  1. He has an e pawn against a c pawn, meaning the better center pawn structure.
  2. BOTH of his bishop's diagonals are free and clear.
  3. He can "castle by hand" after c6 by Kc7 (and from there to b8 if desired).
  4. White hasn't developed any king side pieces, so it will be a while before he can castle, at least on the king side. Given this fact, Black is not at a disadvantage.