411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nf3/3...Nf6/4. Nc3/4...dxc4/5. a4/5...Bf5/6. Ne5/6...Nbd7/7. Nxc4/7...Qc7/8. g3
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Slav defence D17 Central variation
8. g3
This move prepares to develop both bishops; the dark-squared bishop to f4 and the light-squared bishop to g2. This move doesn't deter Black from playing /8...e5/ which has been prepared with Black's previous moves.
Theory table
Carlsbad variation 8...e5 dxe5 9. Nxe5 Bf4
References
See also