1.d4 e6 2.c4 Bb4+ 3.Bd2 a5 4.Nc3
After 4.Nc3 (instead of 4.Nf3, see Marin’s article in CBM 139) White is hoping to force Black into capturing on c3, whereupon he can recapture with the bishop. (Language: German and English) 12 commented games (Language: English)