Thomas van Linge has created some maps that make clear how isolated the Kurds in Kobane have become in the last few weeks.
At the beginning of September, the YPG controlled an area around Kobane that ran from the Euphrates river about 50 miles eastward. In the map below, this is shown as the central yellow enclave.
The area now controlled by ISIS (shown in gray) has reduced the YPG foothold to less than the Kobane city limits.
To view either of these maps in greater detail just click on the images above.