[ECO code A11 > 12]
Anglo-Slav Defence
Black's Queen's Pawn advance frees his QB to develop outside a pawn formation and threatens White's undefended QBP. He aims to occupy and hold the centre for as long as possible but also threatens 3..P-QKt4 (to take and keep White's QBP). Categorised under Reti until 1960s ECO coding.
White Black Alt. Reti O. route 1. P-QB4 P-QB3 (1. Kt-KB3 P-Q4 ) 2. Kt-KB3 P-Q4 (2. P-B4 P-QB3)
WHITE to or Undo or Jump or Clear