Polish Opening: King's Indian Variation: what should White play?

c4! — Excellent Choice!

✅ One of 5 top moves — you found a winning strategy!

Why this move is excellent: By playing c4, you are seizing space in the center and challenging Black's control over the d5 and b5 squares. This move perfectly complements your b2 by creating a powerful "English-style" setup that exerts long-range pressure across the board.

Multiple Valid Strategies

This position is incredibly flexible. You found the engine's favorite, but there were four other paths to equality:

Different paths, same destination: While e3 is the most common human choice (22%), your move c4 is a "hidden gem" rarely found by players at this level. It transitions the game into a more aggressive, hypermodern struggle compared to the quieter, more defensive alternatives.

Your Continuation

After c4: Bg7 Nf3 O-O a3

What Made This Move Good

You correctly saw: That the b4 was already providing a platform for queenside expansion. Instead of playing passively, you doubled down on that space advantage. You recognized that Black's fianchetto with g7 allows White time to set up a broad pawn front.

📚 Takeaway: When you have five equally good options, the "best" move is the one that fits the type of game you want to play. You chose the most principled, space-gaining option!