starting field without 20-point cards
In hanafuda, a starting field that does not contain any 20-point cards (such as the 'light' cards). This is a technical term used in specific game variants.
See also: 場
When it's a 小場, since no high-scoring cards are on the field, you need to play carefully.
Compound of 小 (small, minor) and 場 (field, place), referring to a hanafuda field without high-value cards.