Train changeover

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In chess, a move change ( transposition ) is the achievement of the same position (including castling , move and en passant rights) via different move sequences. Particularly often - but not exclusively - train changes occur during the opening . A simple example is this:

The King's Gambit begins with the move order 1. e4 e5 2. f4. From's Gambit, on the other hand, begins with 1. f4 e5. If a game is opened with From's Gambit, White has the option of playing the King's Gambit "by changing moves" with 2. e4.

In professional chess, where preparation for the opening plays a major role, move changes are an important means of avoiding certain variants and luring the opponent into unknown territory.

Example: transition to another opening

The game Josef Halbritter - GM Lechtýnský (Oberliga Bayern 2001) apparently started with Caro-Kann : 

 1. e2–e4  c7–c6
 2. d2–d4  d7–d5
 3. f2–f3  e7–e6
 4. Sb1–c3 Sg8–f6
 5. e4–e5  Sf6–d7
 6. f3–f4  c6–c5

This position is also a variant of the classic system of the French defense that is often played : 

 1. e2–e4  e7–e6
 2. d2–d4  d7–d5
 3. Sb1–c3 Sg8–f6
 4. e4–e5  Sf6–d7
 5. f2–f4  c7–c5

In the Caro-Kann variant, the white pawn gets to f4 via f3, the black pawn via c6 to c5. In the French variant, the pawns go straight to f4 and c5. This means that this position is reached one move earlier.

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