This 70 page book in German language covers the Sicilian flank or wing gambits (Easy to read with the Google translate app) 1 e4 c5 2 b4 or 1 e4 c6 2Nf3 — 3 b4. The latter is particularly effective when black has played 2…d6 which eliminates the defense of … d5 used against the 2 b4 line as now 3…d5 would leave black a tempo down. It uses 50 heavily annotated games to demonstrate the opening. Especially at fast time controls, your opponents are unlikely to know how to play against it. Just look at the photos. Marshall destroyed the master Ragosin in only 26 moves. Game 50 shows the strong Hungarian Grand Master Portisch crashing to defeat by a local master. This book cost about six dollars in the mid-1980s, worth about $18 today. I could not find a copy for sale by an American seller as of early April 2025; from a German seller the lowest price was $15 and you would pay about that much again for shipping from Germany. Buy my copy and save!