This move prevents White from establishing a full pawn centre with 2.

White aims to set up a classical pawn centre with 3.

With 8 c5 and 9 Nc6, Izoria put pressure on the white pawn center.

White's third move prepares to build a powerful pawn center with 4.

These openings allow White to build up a pawn center with 2.

If Black allows White to give firm support to his pawn center, which controls so much space, he will have no chance to survive.

White will attempt to create a pawn centre and develop his pieces to prepare for an assault on the Black position.

Reshevsky, playing white, appears to have an advantage due to his strong pawn center, which may become mobile after Bf3 and d4-d5.

Nc3, threatening to set up a big pawn centre with 4.

Black's strategy is to obtain exchanges to diminish the strength of the white pawn center.