The Richter-Rauzer Variation, Classical Variation, Kantscher Line is a variation of the Sicilian Defense, catalogued as ECO B63. The line runs 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O Nxd4 9. Qxd4 a6 10. f4 b5, reaching the position shown below after 20 half-moves.
White holds the centre with pawns on e4. Development is level at three minor pieces each. It is White to move after ten moves. White has castled while Black’s king is still uncommitted.
On the Sicilian Defense generally: The most popular and aggressive response to 1.e4. Black fights for the center asymmetrically, leading to rich tactical play.
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The Richter-Rauzer Variation, Classical Variation, Kantscher Line goes 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O Nxd4 9. Qxd4 a6 10. f4 b5. It is a variation of the Sicilian Defense and is catalogued as ECO B63.
The Richter-Rauzer Variation, Classical Variation, Kantscher Line is ECO B63. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Sicilian Defense.
Stockfish evaluates the position after 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O Nxd4 9. Qxd4 a6 10. f4 b5 at +0.61 at depth 18, which is a small but real edge for White. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
White holds the centre with pawns on e4. Development is level at three minor pieces each. It is White to move. White has castled while Black’s king is still uncommitted.