Snake and Horse compatibility
Snake (Si, 巳) and Horse (Wu, 午): no named relation.
These are fixed relations among the twelve branches of the Chinese calendar, set out in the classic San Ming Tong Hui (三命通会), written in 1578, quoted below. They describe the signs, not two people: no classic gives a method for matching two people by their signs, so there is no score here.
What the book says
Snake and Horse have none of the relations: no harmony, clash, punishment, harm or break. The book has nothing to say about this pair in particular.
Their elements
The Snake is Fire and the Horse is Fire: the same element.
How much it counts
A sign is one character of the eight in a BaZi chart, the year’s branch. The book reads these relations between the pillars of one chart, and tells the reader to look at the whole chart’s elements first:
Clash and break, three harmony and six harmony: where a chart has them, ask next how its five elements get on. Misfortune may give rise to blessing, and blessing to misfortune.
相冲相破,三合六合,命中有之,即求五行相得何如。或祸中生福,福中生祸
San Ming Tong Hui, volume 3: On the symbolic stars as a whole (总论诸神煞) · source text
Birth years, and 2027
- Snake: 1929, 1941, 1953, 1965, 1977, 1989, 2001, 2013, 2025. In 2027, the Year of the Fire Goat (Ding Wei, 丁未), the Snake has no clash with the year.
- Horse: 1930, 1942, 1954, 1966, 1978, 1990, 2002, 2014, 2026. In 2027, the Year of the Fire Goat (Ding Wei, 丁未), the Horse is in harmony with the year (Liu He, 六合).
A sign’s year is usually counted from Chinese New Year, between late January and mid-February; BaZi counts it from the Start of Spring, about 4 February. Born in January or early February? You may be the sign before: the sign pages check your date.
Two real people?
Each person’s chart has eight characters, and the same relations run between all of them, not only the two signs. The two-chart page sets both charts side by side, branch by branch, and gives what each chart says about marriage on its own. No score there either.
Snake with the other signs: Rat · Ox · Tiger · Rabbit · Dragon · Snake · Goat · Monkey · Rooster · Dog · Pig.
Horse with the other signs: Rat · Ox · Tiger · Rabbit · Dragon · Horse · Goat · Monkey · Rooster · Dog · Pig.