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Foundation chain: ch multiples of 18 -1 (17, 35, 53, 71 etc)  For this afghan I did 9 repeats and my foundation chain was 161.

Row 1: dc in 3rd ch from hook (counts as the first dc in the cobble pattern), *work the cobble pattern for a total of 7 stitches up the side of the front mountain.  Increase in the next ch, work the cobble for a total of 7 stitches down the back side of the mountain, decrease over the next 3 stitches, repeat from * across.  Do not work the final decrease at the very end, just end with the 7 stitches down the back side of the last mountain. Ch 1 turn.

Row 2: Work beginning of row decrease over the first 2 stitches (counts as the first dc of the cobble pattern), *work the cobble pattern for 7 stitches up the front side of the mountain, increase, work cobble pattern for 7 stitches down the back side of the mountain, decrease over the next 3 st, repeat from * across.  Do not work the final decrease, instead work the end of row decrease over the last 2 stitches (will count as the last dc in the cobble pattern)

Row 3 and onward: Repeat row 2 changing colors as you like until your project is as long as  you like.  For my project I did 3 rows of each color before changing to the next color.  For the best results from this pattern I recommend using as least 2 colors.

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