The reply 1...c5 is also playable, but gives White more opportunity than other moves to transpose into standard openings where he may have a small advantage. The move 1...c5 2.e4 transposes into the Alapin Variation of the Sicilian Defence. The sequence 1...c5 2.d4 is also possible, when 2...cxd4 (2...e6 3.e4 d5, transposing into a French Defence after 4.e5 or 4.exd5, is also possible) 3.cxd4 d5 transposes into a regular Exchange Variation of the Slav Defense (usually reached by 1.d4 d5 2.c4 c6 3.cxd5 cxd5), which gives White a slight advantage.