The big idea

What the Bogo-Indian Defence is really about.

A flexible, low-theory cousin of the Nimzo-Indian. With the check 3...Bb4+ Black eases development and sidesteps the heaviest opening preparation. The bishop is usually traded or retreated, and Black settles into a sound, comfortable position without committing to anything sharp.

White's plan: Meet the check simply (Bd2 or Nbd2), keep the bishop pair if it can be won, build a broad centre with e4, and use the extra space for a small, lasting edge.
Black's plan: Trade or retreat the b4-bishop to finish development smoothly, keep the position solid and flexible, and aim for the freeing ...d6/...e5 or ...d5 breaks once the pieces are out.

After 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+

The Bogo-Indian checks with 3...Bb4+ to provoke a small concession, then plays a calm, low-theory game with ...d5 or ...b6 — the Nimzo's quieter cousin when White avoids 3.Nc3.

What is the point of the early check 3...Bb4+ in the Bogo-Indian?

Answer the question to keep going!