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While merging all of your Pawns into the pieces behind them may limit your mobility some, just converting the Bishops into Rooks only costs you two Pawns for an increase of 1 or 2 Pawns in force (depending on if you rate Rooks at the more common 5 Pawns, or Spielmann's 4.5), and still leaves you 6 Pawns <strong>and</strong> gives you some very impressive attack lanes, allowing you free use of the new Rooks in the opening and midgame. Now, promoting a Rook to Queen, dispite the gain of 1.5 to 2 Pawns is less obviously a good idea because of the leveling effect.