A friend of mine sent this to me:
http://sudokuhelper.kevinpluck.net/?g=0avd2ZEJppMILKJG4m4u86SM80c3Gu82c6q0JoM0E9bEe24Y4P0GwEh84Z4BG133GW1JPF8259W0YOIC044OpX0YoI0E6GsG0MKqW1M6a110u500Ecam8qs620
I am completly stumped, I have only found one number! I can't spot any naked pairs, rectangles or x-wings. The only thing I can think of would be swaord fishes, but I don't know how to spot them.
Please help!