This book presents the Triangle set-up, which arises after 1.d4 d5 2.c4 e6 3.Nc3/Nf3 c6. This move order avoids many unpleasant systems for White, notably the Catalan, the Exchange Slav and the Botvinnik Variation. It leads to sharp strategically unbalanced play and brings Black excellent practical results. Semko Semkov is a chess journalist and theoretician. He has co-authored the famous books The Modern English, The Most Flexible Sicilian, Attacking the English/Reti, Attacking the Flexible Sicilian and Understanding the Queen’s Gambit Accepted.