I think the move 4.Bxc6 in the Ruy Lopez should be discourge b'cos the Bishop should be preserved 1st in order to t8ke prt in the centrl struggle. If the Bishop proves of no worth, then u exchnge it.

thx mylizana

good game roma

I see~ thx for the info~

Well, the idea of 4.Bxc6 is to play a very positional and somewhat quiet game. White will have the awesome pawn chain c2-d3-e4 (white shouldn't exchange the e-pawns) and later in the game will think of making a breakthrough with f4. Black has also a good pawn structure (the doubled c-pawns are not weak) but white's is better and he have one more pawn in the center. It's a very tough game to play if you're not a grandmaster with great positional skills.