Rapport-Jobava System

Named after Baadur Jobava and Richárd Rapport: White adds Nc3 to the London setup for a sharper game. Often called the Jobava London.

It is reached after 5 moves: 1. d4 d5 2. Nc3 Nf6 3. Bf4.

Black is to move and has 29 legal moves. Over the next four moves — two for each side — the game can branch into 981,349 different games. Those games reach 324,217 different positions: most positions can be reached in more than one way, 3 on average.

The Lichess opening list names 2 further lines after this position.

The same moves can be played in 6 different legal orders that all reach this position. For example 1. Nc3 d5 2. d4 Nf6 3. Bf4, which starts as the Van Geet Opening.