With more than 70 options just for the opening training Chess Position Trainer is unmatched. Since June 2004 on the market, Chess Position Trainer changed significantly the methodology of training chess openings and this being an absolutely free of charge chess program! - Read more

The Lion's den is a variation that follows after 4.f2-f4. White develops a strong centre by moving three pawns into the centre (d4, e4 and f4). Often your opponent thinks he is playing against a Pirc variation. Of course the first two moves are the same. It is also possible that white thinks 4.f2-f4 disproves the Lion. Even after the strong advance of the centre pawns the Lion still stands. After exchanging Queens black has a better position than white. This variation is a good illustration of the flexibility of the Lion. - Read more