411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. Nc3/4...fxe4/5. Nxe4/5...Nf6/6. Qe2/6...d5/7. Nxf6/7...gxf6
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tright Ruy Lopez, Schliemann Defence rd bd qd kd bd rd pd pd pd pd nd pd bl pd pd nl pl pl pl pl ql pl pl pl rl bl kl rl Common moves: 8. d4 - Main Line 8. O-O - Dubai Variation 8. Nd4 - Georgiev Variation
8. d4, threatening the e5-pawn, is the move that really gets to grips with Black's pawn centre - given that 8.Nxe5 straight away is not possible because the White queen is pinned after 8...fxe5 9.Qxe5+ Qe7.
Krum Georgiev tried 8. Nd4, not to show off how many Black pieces White has managed to pin, but to threaten a queen check on h5 that would deprive Black of castling rights. It's not such a threat though, as ...Qd6 solidifies the c6-knight and makes room for the king on d8.
An improved version of 8.Nd4 is 8. O-O, which was played three times in the 2014 world rapid and blitz championships in Dubai. White postpones the decision about what to put on d4. If Black pre-empts Nd4 with ...Qd6, White can switch tack with 9.d4.Ruy Lopez