Ginger Chicken

2 1/2 to 4 pounds cut-up chicken
2 teaspoons chili powder
2 teaspoons salt
16 ounces plain yogurt
8 large cloves garlic, minced
2 x 2-inch piece ginger root, peeled and ground

To grind garlic and ginger easily, peel and chop coarsely. Put small amount of yogurt in blender, ad ginger and garlic. Pur