Polish Opening
Quick reference
1.b4, sometimes called the Sokolsky Opening after the Belarusian master who wrote the first serious analysis of it, stakes out queenside space on move one instead of contesting the center directly. The plan is straightforward: expand with b4 and c4, fianchetto the light-squared bishop to b2 where it eyes the long diagonal toward g7, and let Black commit to a central structure first.
Unfashionable, not unsound
This belongs in a different category from most of the openings on this list. It isn't objectively bad the way a genuine unsound gambit is — 1.b4 doesn't lose material and doesn't create a structural weakness that can be targeted by force. It's simply passed over because it hands Black a free choice of central setup and doesn't fight for the center the way 1.e4 or 1.d4 do, which most players find a poor trade even when it isn't a losing one.
There is exactly one line every Polish Opening player has to know cold, because it's the most direct way Black can punish the move. After 1.b4 e5 2.Bb2, the bishop attacks e5 along the long diagonal — but the pawn on b4 is now completely undefended. Black can simply take it: 2...Bxb4, and the pawn is gone for nothing unless White has follow-up compensation.
Recapture the center, don't chase the bishop
White's answer is 3.Bxe5, recapturing the center pawn instead of chasing the bishop. Material is level again — a pawn for a pawn — but White has traded the queenside space that was the whole point of 1.b4 for open lines and an active bishop pair. It's a real, playable position, not a refutation, but it's the critical test and the one line that has to be prepared.
For the more established way to play a flank opening that keeps the center flexible without giving anything up, see the English Opening, 1.c4's much more common cousin.
Starting position. Polish Opening — the critical test after 1...e5.
The critical test: 1...e5 and the pawn grab on b4.
Frequently Asked Questions
What should Black play instead of grabbing the b4 pawn?
1...d5 is the other principled reply — it stakes a claim in the center immediately rather than reacting to White's flank expansion, and sidesteps the whole 2...Bxb4 line entirely since there's no bishop-attacks-e5 tension to exploit.
Is 1.b4 ever seen at a high level?
Occasionally, mostly as a surprise weapon in faster time controls where opponents are less likely to know the critical 2...Bxb4 line cold. It is not part of any serious grandmaster's main repertoire against 1...e5 or 1...d5 replies specifically, which tells you more about its practical bite than its theoretical soundness.
Does declining b4 with something other than e5 or d5 avoid the theory?
Any reasonable developing move sidesteps the specific b4-grab line, but it also gives up the chance to punish White immediately — most players who see 1.b4 for the first time do better learning the one critical reply than avoiding the position altogether.