Cyc
Looking for the door...
The questionable tile to the North was definitely Tundra. Figuring that the river originated in the mountains, I would have moved SW also (I didn't expect it to shoot off to a coast in the NE). But as it turned out that location wouldn't have given any REAL good core locations to the East.
Now I believe your best capital location is one tile South to the Grassland. Put the capitl there to give the tile a shield. You'll get your wheat with the initial expansion, so no big delay there. Go Warrior/Granary first, researching Pottery. I'm guessing moving South may well reveal a lux. You'll be on the river with 4/5 Forest tiles (at least) and two BGs, plus the wheat. And you'll have changed that Grassland to a BG automatically.
Now I believe your best capital location is one tile South to the Grassland. Put the capitl there to give the tile a shield. You'll get your wheat with the initial expansion, so no big delay there. Go Warrior/Granary first, researching Pottery. I'm guessing moving South may well reveal a lux. You'll be on the river with 4/5 Forest tiles (at least) and two BGs, plus the wheat. And you'll have changed that Grassland to a BG automatically.