1.f4 is the Bird opening. Henry Bird played it. He wanted to leave the mainstream and create new original positions. He liked a setup with b3 and Bb2. The Polar Bear System (PBS) played with the same intention. To leave the trodden theory paths and enter new undiscovered terrain. The system starts with a fianchetto of the Kings Bishop after 1.f4, d5. PBS players want to enter exciting and original positions where it is rough for Black to play for a flat equality. The book is for club players, but also professionals can get inspiration. The book contains both volume 1 & volume 2. GM Henrik Danielsen www.polarbearsystem.com

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Opdateret den: 21-08-2026 07:39