Bogo-Indian Defense: Monticelli Trap is a chess opening with the ECO code E11, part of the Bogo-Indian Defense family. It goes 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 O-O 8. Nc3 Ne4 9. Qc2 Nxc3 10. Ng5. White opens with 1. d4 (the queen's pawn) and Black answers 1... Nf6. After 19 moves it is Black to move. After the last move Black is 3 points ahead in material. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. d4 – White plays the pawn to d4
1... Nf6 – Black plays the knight to f6
2. c4 – White plays the pawn to c4
2... e6 – Black plays the pawn to e6
3. Nf3 – White plays the knight to f3
3... b6 – Black plays the pawn to b6
4. g3 – White plays the pawn to g3
4... Bb7 – Black plays the bishop to b7
5. Bg2 – White plays the bishop to g2
5... Bb4+ – Black plays the bishop to b4, giving check
6. Bd2 – White plays the bishop to d2
6... Bxd2+ – Black takes on d2 with the bishop, giving check
The line goes on for 7 more moves; the lesson shows them all.
About the Bogo-Indian Defense
After 1.d4 Nf6 2.c4 e6 3.Nf3, Black gives check with 3...Bb4+. It is a calm, solid cousin of the Nimzo-Indian.
White blocks with Bd2 or Nbd2; Black often trades bishops.
Black can play ...Qe7 and ...d6 with ...e5, or ...d5 for a QGD-like game.
The trade of dark-squared bishops makes Black's position easier.
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