This post contains checkpoints for my sysudokie friends following the blog on Maestro 50 and Maestro 4

On the Maestro 50 coloring:

In the first coloring, 8’s in E and SE and 9 in SE, are trapped.  They all see both blue and green peers. Also the 8-candidate in r5c8 is replaced, regardless of which color is true.

The extended cluster then forces a green 9 in r9c9 and a blue 8 in r9c8.  The latter forces a blue 2 in r9c5 and a green 2 in r9c9.  Either the single blue in r9c5 or  the double greens in r9c9 confirm blue and collapse Maestro 50.

On Maestro 4, the nice loop and swordfish add to the fine set of slinks for coloring.  Your 2-panel shows slink partners covering the grid, and spreading the colors to other numbers in bv.  This another advantage gained from this tool.  To get the blue/green cluster of  the checkpoint start with a blue 2-candidate in r2c4. Expect to find one color trap, with the removal generating one more. 

The blue/green cluster leaves out many slinks, and this is an incentive to start a second cluster.  I like to go with orange and red, because they are distinctive default colors for text box fills in ©PowerPoint.  Start with a red 8-candidate in r8c5.  This new cluster is limited to the S and SE boxes,  plus one candidate in E.  Can you bridge the clusters?  That is to say, merge them into one?  I’ll walk you through the logic in my next post.