Polish Opening: Zukertort System is a chess opening with the ECO code A05, part of the Polish Opening family. It goes 1. Nf3 Nf6 2. b4 g6 3. Bb2. White opens with 1. Nf3 (the Zukertort/Réti knight move) and Black answers 1... Nf6. After 5 moves it is Black to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. Nf3 – White plays the knight to f3
1... Nf6 – Black plays the knight to f6
2. b4 – White plays the pawn to b4
2... g6 – Black plays the pawn to g6
3. Bb2 – White plays the bishop to b2
About the Polish Opening
White starts with 1.b4, an offbeat flank move. The idea is Bb2 aiming at e5 and space on the queenside.
Bb2 pressures e5 and the long diagonal.
The b4 pawn is loose; ...e5 with ...Bxb4 can win it.
It is rare at top level; it works best as a surprise.
chessGM