20/01/2016 - This is a puzzle steming from a Bird's opening variation, The first move isnt forced. but very necessary if hoping to continue strongly with this opening. 09/03/2015 - The Polar Bear System starts with 1.f4 (the Bird opening) and then . Every game and every move has been checked by the chess programs. New chess book out! www.polarbearsystem.com. . The Polar Bear System. Polar Bear System PBS. Loading . Chessdom - 1.F4 Complete Chess Course In Bird - Polar Bear by GM Henrik Danielsen. Chess Openings - The Polar Bear Game. . Chess Openings - The Polar Bear Game. Chess Arena. Loading . The Polar Bear System by GM Henrik Danielsen: https://amzn.to/2ReCUbB . Game. lichess • Free . Check out my Chessable Repertoires: Black vs 1 d4 based on the Benko Gambit: https://goo.gl/V8cNHo White . By GM Joel Benjamin. March 18, 2009. Mr. Benjamin, I am an A class player rated around 1850. I prefer openings which have very forcing lines, which lead to . He liked a setup with b3 and Bb2. The Polar Bear System (PBS) played with the same . of an Underrated and Dynamic Choice for White (Everyman Chess.