Michael Basman and Grandmaster Spyridon Skembris are advocates of the opening. It has a certain surprise value, and the average player is unlikely to know how to refute it and more likely to get overconfident and make mistakes. Moreover, the lack of theory along this line may negate the repertoire of an experienced opponent. Intuitive play by Black can lead into dangerous traps. Many of these traps rely on Black's replying with 1...d5, attacking the pawn with his . White can sacrifice the pawn with 2.Bg2 Bxg4 3.c4 with Qb3 to follow, giving White some pressure against the weakened squares d5 and b7. Black is not obliged to give White these opportunities. In response to Grob's Attack, Black may also play 1...e5. Good responses would be 2.Bg2 (dominating the light-squared centre diagonal) or 2.c4, the English Variation, preparing Nc3 to solidify White's control of d5. After 1...e5, Black can take aim at the h4-square, left weak by White's pawn advance. 2.Bg2 h5 will force a weakening of White's pawn structure. 2.d3 (intending to answer 2...h5 with 3.g5) or 2.h3 can be answered by 2...Ne7 with the threat of ...Ng6 followed by ...Nf4 or ...Nh4, disrupting White's kingside fianchetto. Another frequently used setup for White in the Grob is 1.g4, 2.h3, and 3.Bg2. A Black counter-setup might be 1...d5, 2...e5, and 3...c6 (these moves may be played in any order), which, if used in conjunction with an eventual ...e4, negates White's 's influence over the centre. A key element of the Grob is deploying the king's bishop on g2 and having it rule the diagonal. In order to further this goal, White must keep the centre clear of pawns. This leads to frequent "tearing at the centre" with c4 often being White's third move. Due to the unusual pawn structure White attains by playing g4 and c4 so early in the game, there is frequently little advantage to castling. Play often devolves into a wild and wide-open game, with a definitive advantage usually resolving itself in the first 20 moves. Borg Defense Black responding to any opening move by White with 1...g5 is called the "Borg Defence", Borg being the reverse spelling of Grob. If played specifically in response to 1.e4, it is also called the Basman Defence, after Michael Basman. See also List of chess openings List of chess openings named after people Irregular chess openings References Bibliography Chess openings