In his 2009 strategy guide for Colle Players, The Moment of Zuke, David Rudel wrote that the main line of the c3-Colle was a dead end for White.
He proposed a new idea, meeting 1.d4 d5 2.Nf3 Nf6 3.e3 e6 4.Nbd2 c5 5.c3 Nc6 6.Bd3 Bd6 7.O-O O-O with 8.dxc5 Bxc5 9.b4!, a line he dubbed the Koltanowski-Phoenix Attack.
Rudel promised to write a treatise on this new idea, and—two years later—he has delivered. Koltanowski-Phoenix Attack: The future of the c3-Colle gives extensive coverage of all critical defenses.
Yet its presentation allows a player to begin using the Koltanowski-Phoenix almost immediately.
David Rudel is an authority on the Colle System, Koltanowski-Phoenix Attack: The Future of the c3-Colle being his third book intended for Colle System players.
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Bab Wilders, Nederlands Dagblad:
"An excellent opening book."