context: 1. d2d4  1... d7d5  2. c2c4  2... c7c6  3. c4d5 The Exchange Variation of the Slav Defense is a solid option for White and suits Lazavik's positional style. 3... c6d5  4. b1c3  4... g8f6  5. c1f4  5... b8c6  6. e2e3  6... a7a6 One of Black's most combative options.