There were runners on first and second with one out. Lou brought Eyre in to face LaRoche. After LaRoche struck out, Lou decided to bring Wuertz in to try to get the next guy out and end the inning. Since he only had Wuertz and Ascanio left, Lou had to use Wuertz for more than 1 inning. Wuertz was due up 3rd the next inning, so the only way to keep Wuertz from batting was to doubleswitch. Blanco was the last guy remaining on the bench, and based on where the Cubs were in the lineup (they had just finished with Ramirez the previous inning) Lee was the only candidate to be replaced. Lou gambled that the Cubs could score before they got all the way back around to Lee's spot. The mistake lies in bringing in Wuertz, not the double switch. If you let Eyre pitch to one more batter, you can then pinch-hit for him the next inning and then bring in Wuertz. Once Lou pulled Eyre, the double switch made sense, but I'd rather gamble that Eyre can get the next batter out then be forced into that decision. I actually thought that the decision to bunt with Blanco was a poor one. He had walked the previous two hitters. Blanco is better against left-handers than right-handers. It was a 1-0 count. I'd let him take a strike (showing bunt) and hope that the pitcher either continues to be wild or attempts to groove one over expecting the bunt attempt. Thanks for the thorough explanation. So basically it was Lou overmanaging, like he's been doing more and more lately. I'm still a fan of his, but he's starting to wear on me.