[fullwaza]

There are values associated with pieces. Without considering the position, a pawn would = 1, Knight = 3, Bishop = 3.5, Rook = 5, and Queen = 9. I've not seen the game yet, but if he traded a Queen for 2 rooks that isn't such a bad deal.

[Andrew_nenakhov]

Modern engines value the pieces more, like knight/bishop ar 4.1, rook closer to 6 and queen at 11.