Re: More scoring system questions! (and some motor controller stuff)
I'm also a fan of pololu motor driver boards.The only problem I've ever had with a pololu board was from stupidly connecting a way too massive stepper motor to a stepper driver board - burned two of them out from over-voltage (back-EMF) and/or over-current before I thought to test with a smaller motor.
If you are sure they are 6V motors and you were to measure the current, and it was less than 1A sustained, you might be able to get away with the $6~$7 DRV8833/8835 driver boards - tiny little boards in a DIP14/16 footprints. Might not work too reliably if it is 1A+ sustained (although if you only have one motor to drive, you could hook both H-bridge channels in parallel to split the load between them). Just a thought... YMMV.
Please pardon the pedantry... and the profanity... and the convoluted speech pattern...
"I give you 80mg fluoxetine, 10mg buspirone (4x daily), plenty of food and sleep, and still you are failing me, Brain!"