1 + 1: two leaders. Either co-founders, or a power struggle. Works when each has separate domains.
1 + 5: fireworks. Initiative meets freedom; the two enjoy each other’s independence. Risk: neither manages the kitchen.
2 + 6: home and harmony. The peacemaker and the carer build a calm domestic life. Risk: blandness, conflict avoidance.
3 + 7: surface and depth. The communicator and the thinker bring out the other’s missing half. Risk: each underestimates the other’s contribution.
4 + 6: home-builders. The most domestic combination in the system. Reliable, family-oriented, traditional. Risk: routine becomes a substitute for intimacy.
5 + 9: the wanderers. Two travellers, two big-picture thinkers, two people who forget to pay the gas bill. Brilliant on adventure, weak on logistics.
7 + 7: the hermit risk. Two introverts can build a beautiful inner world together — or quietly stop talking. The pairing needs deliberate outward contact.
8 + 8: the power couple. Two executives can be electric or exhausting depending on whether they agree on the shared goal. Without a shared mission, they compete.
These are tendencies, not verdicts. Any pairing can work; any pairing can fail. The cheat-sheet is the conversation-starter, not the conclusion.