What is Affinity? (A Simple Guide to Uma Musume Breeding)

Welcome, Trainer! In the dazzling world of "Uma Musume: Pretty Derby," raising a champion is about more than just tough training; it's about family. The **Inheritance** system is where you take two of your beloved retired Uma Musume and have them pass on their strengths to a new filly, giving her a powerful head start in her racing career. The secret ingredient in this process is **Affinity** (also called compatibility). Think of it as a "friendship score" between all the characters in your new Uma's family tree. A higher total affinity score means there's a much better chance that your new girl will inherit amazing stats (like those coveted 3-star blue factors) and powerful skills from her parents and grandparents. It's the key to turning a good filly into a legendary champion.

This calculator is designed to be your personal breeding strategist, taking the mystery out of the game's hidden mechanics. It doesn't just give you a single number; it shows you a **detailed breakdown** of where every point of affinity comes from. You can see the score between the two parents, between a parent and a grandparent, and even between the grandparents themselves! This lets you experiment with different combinations to find the absolute best pairings. We've also included a **"Share Link"** feature, so you can save your perfect breeding plans or share them with friends to get their advice. It's all about taking the guesswork out of inheritance so you can focus on what matters most: raising the next superstar to win the URA Finals!

How to Use the Calculator

Finding the perfect match for your next champion is easy and gives you instant feedback:

1. Select Your Lineage: In the two "Parent" sections, use the dropdown menus to choose your two parent characters and all four grandparents.
2. See the Affinity Score Instantly: As you select each character, the "Total Affinity Score" on the right will update in real-time. The character images will also appear so you can see your chosen family tree.
3. Analyze the Breakdown: Check the "Affinity Breakdown" section in the results panel. This will show you exactly which pairs are contributing the most to your score, helping you identify your strongest links.
4. Experiment and Share: Don't like the score? Try swapping out a grandparent and see how the numbers change. Use the "Randomize" button for inspiration, or "Reset" to start fresh. When you find a great combo, click "Copy Share Link" to save it!

Tips for a Great Inheritance

• Aim for the Triangle (◎):** The easiest way to get a huge affinity bonus is to look for "affinity triangles." This is where three characters all have a special, established relationship in the game's story (like Special Week, Silence Suzuka, and Tokai Teio). If you can make these three a parent and two grandparents, you're almost guaranteed a great score. In the game, this is shown with a double circle (◎).
• Don't Forget the Grandparents:** You might be surprised to learn that the affinity between the grandparents is just as important as the affinity between the parents! A fantastic set of grandparents with strong connections to each other and to the parents can make up for a less-than-ideal parent pairing. Use this tool to experiment with different grandparent combinations to maximize your score.
• G1 Wins Matter:** The affinity scores in this calculator are the "base" scores. In the actual game, you can get even more points if your parent and grandparent characters have won a lot of G1 races, especially the same ones! A parent with many G1 wins is a much better breeding partner.
• **Look for Shared Traits:** Affinity also gets a small boost if the characters share traits, like being in the same dorm, having the same running style, or being the same age. Every little bit counts!