In reply to Mr. Lee:
I thought I was the only one that thought anything of this! I noticed it several years ago - there were actually two borders, a red and a yellow line, as they have in parts of India where there is 'disputed territory', but just in the last year or two the 'inner' western line has become the sole border.
I passed this on to LindsayG a few years ago and he didn't seem to think much of it, so I just let it go. I can't believe more has not been made of it, either in mountaineering circles or in wider political circles. China did a similar thing with Kula Kangri, on the Bhutan border, in the late 90s or early 2000s, but that's a much less visited area so nobody seemed to care - except Bhutan, who lost their highest mountain.
It's bizarre that they'd change the border off the watershed of the main N-S range, just in this area, and take that odd sliver of the upper Inylcheck. It doesn't seem to make sense geographically and I don't know of a historical reason.
It's like China suddenly telling Nepal that the chain of peaks west of Everest BC - Pumori, Gyachung Kang, Cho Oyu - are now wholly within China and not half in Nepal at all.