Recipe needs a little tinkering, which is why I haven't written it up in detail. The chicken was good, but the yam and tomatillos basically disintegrated - next time I'll add them after the chicken has cooked a bit. Also, I think I overdid it on the chilies a bit. And I think next time I'd reduce the amount of orange juice (I squeezed three whole oranges), and maybe use a mix of orange and lime juice.
I think now that I've proved that I can reliably do a decent braise or stew with added beer, I really ought to try one of those beer bread or beer cake recipes that I've collected.