Taken together, the two Alekhine-Euwe matches of 1935 and 1937 are arguably the most interesting and instructive matches ever contested. The reader will find them true "chess-thrillers" of the "I couldn't put it down until I finished it" variety. In each, the lead changed hands several times. There were smashing victories, hairbreadth escapes, overlooked opportunities, and even a few stunning double-blunders. Lines in the Slav Defense to the Queen's Pawn were debated by the players. Over and over, "improvements" were trumped by better "improvements" only to be turned around, by the loser, transforming himself into a winner with another "improvement!"