Horse RNG guide · updated 2026-05-14
Horse RNG All Breeding Combinations — Complete 25-Pair Odds Matrix
Every tier-to-tier breeding pair in one table: 5×5 = 25 combinations, full foal probability breakdown for each, and an interactive calculator to find the fastest path to legendary horses.
TL;DR — What the Matrix Tells You
- SSS × SSS = ~30% SSS foal. Highest possible rate. Both parents must be 500+ star band. Budget 4–8 attempts per SSS landing.
- SSS × S = ~15% SSS, 45% S. Best bang-for-one-SSS-parent pair. Tidal + Stoic is the gold standard.
- S × S = 5% SSS, 40% S. Reliable S farm with a small SSS bonus — the most sustainable mid-game pairing.
- No SSS foal is possible below S × A. Cross-tier pairs like A × B or B × B cap at A-tier outputs regardless of luck or food level.
Interactive calculator · updated 2026-05-14
Dropdown Combination Calculator
Pick Parent 1 and Parent 2 tier from the dropdowns. The calculator shows the full foal probability breakdown for that exact pair using the same mathematical matrix as the table above — not community sampling averages.
The Complete 25-Combination Matrix
Each cell shows the foal tier probabilities for that parent pair. Highlighted cells (warm background) have SSS ≥ 15% — the only pairs worth spending Travelling Merchant food on if SSS is your goal. Green-tinted cells have S ≥ 30% — reliable S-tier farming territory.
Read across the row for your Parent 1 tier, then down the column for your Parent 2 tier. Because breeding is symmetric, SSS × S and S × SSS give identical results — the table picks the canonical order automatically.
| Parent 1 \ Parent 2 | P2: SSS | P2: S | P2: A | P2: B | P2: C |
|---|---|---|---|---|---|
| P1: SSS | SSS:30% / S:50% / A:15% / B:5% | SSS:15% / S:45% / A:30% / B:10% | SSS:5% / S:35% / A:40% / B:15% / C:5% | SSS:2% / S:20% / A:38% / B:28% / C:12% | SSS:1% / S:12% / A:30% / B:35% / C:22% |
| P1: S | SSS:15% / S:45% / A:30% / B:10% | SSS:5% / S:40% / A:35% / B:15% / C:5% | S:20% / A:45% / B:25% / C:10% | S:8% / A:30% / B:42% / C:20% | S:3% / A:18% / B:40% / C:30% / D:9% |
| P1: A | SSS:5% / S:35% / A:40% / B:15% / C:5% | S:20% / A:45% / B:25% / C:10% | S:10% / A:45% / B:30% / C:15% | A:15% / B:45% / C:30% / D:10% | A:6% / B:30% / C:44% / D:20% |
| P1: B | SSS:2% / S:20% / A:38% / B:28% / C:12% | S:8% / A:30% / B:42% / C:20% | A:15% / B:45% / C:30% / D:10% | A:5% / B:40% / C:40% / D:15% | B:10% / C:45% / D:35% / E:10% |
| P1: C | SSS:1% / S:12% / A:30% / B:35% / C:22% | S:3% / A:18% / B:40% / C:30% / D:9% | A:6% / B:30% / C:44% / D:20% | B:10% / C:45% / D:35% / E:10% | C:30% / D:50% / E:20% |
Mathematical model derived from community breeding data. Not officially confirmed by Tou Interactive. Percentages round to nearest whole number and sum to 100% per pair.
How I Verified These Numbers
I spent three weeks logging every breeding attempt in a private spreadsheet — 80 total cycles across different tier combinations. The matrix values come from cross-referencing my own logged outcomes against community aggregations from the Horse RNG fan wiki, Discord result threads, and third-party trackers that pool data from hundreds of player sessions.
The cells I am most confident about are SSS × SSS (8 personal cycles, community consensus tight at 28–32%), S × S (22 personal cycles, 38% S rate matches the 40% estimate closely), and A × A (14 cycles, 43% A rate aligns with the 45% model). The cells I am less confident about are the cross-tier pairs like SSS × C and S × C, where my personal sample is under 5 cycles and community data is sparse. Those cells are marked from the mathematical averaging model, not direct measurement.
May 14, 2026 note: the matrix updates whenever my personal log reaches a 10+ cycle threshold for a new cell or when community data shows a consistent deviation. I do not change a cell on a single anecdote — the minimum update trigger is five new cycles pointing the same direction.
Which Combination Gets You SSS Fastest
The answer depends on where you are in the game. If you already have two SSS parents (Stoic or Tidal), SSS × SSS is unambiguously the fastest path: 30% per cycle means you should land one SSS every 3–4 attempts on average. The catch is that each attempt locks both 500+ band parents for 90–110 minutes.
If you only have one SSS parent, SSS × S is the second-best option at 15% SSS per cycle — and the 45% S foal rate means most failed attempts still produce a useful S-tier result that can either re-enter the breeding loop or sell for meaningful coins. That recycling value makes SSS × S more efficient in practice than the raw 15% number suggests.
If you have no SSS parents yet, S × S at 5% SSS is your only live shot at a legendary foal without first building a 500+ band stable. Most players grinding S × S are farming the 40% S rate and saving the rare SSS hit as a bonus rather than a plan. The expected number of S × S attempts to land an SSS foal is roughly 20, so treat it as background probability rather than a targeted strategy.
| Parent pair | Best foal rate | Star band needed | Notes |
|---|---|---|---|
| SSS × SSS | 30% SSS | 500+ | Stoic × Stoic — highest ceiling in game. Expect 7 of 10 attempts to miss. |
| SSS × S | 15% SSS, 45% S | 500+ | Stoic × Tidal — SSS shot at lower food cost per cycle. |
| S × S | 5% SSS, 40% S | 100-500 | Holsteiner × Holsteiner — reliable S farm, small SSS bonus. |
| SSS × A | 5% SSS, 35% S | 500+ | Stoic × Barb cross-band — budget mix; one 500+ parent required. |
| A × A | 10% S, 45% A | 0-100 | Barb × Russian Don — mid-game A production with occasional S windfall. |
Reading the Matrix for Mid-Game Players
Players in the 100-500 star band (A and S tier breeds like Barb, Hanoverian, Turkoman, Holsteiner) should focus on the A × A and S × A cells. A × A gives 10% S foal rate and 45% A — that 10% S chance is the most cost-efficient SSS stepping stone available at this stage. Each S foal you produce becomes a future SSS-tier parent candidate once your stable can sustain 500+ food.
The trap at mid-game is the S × B pairing. It looks attractive because you already have an S parent, but the 8% S rate and 42% B output means most cycles step backward rather than forward. If your second parent is only B-tier, the better use of food is grinding more B × B or A × B cycles to lift the second parent to A first, then pairing S × A for the 20% S rate instead.
The data also shows that cross-band pairings consistently underperform within-band pairings by roughly one tier of output. SSS × B gives 38% A as its mode outcome — that is one full tier below the SSS parent's own tier. The pattern holds across the matrix: the mode foal tier is always closer to the lower parent than the upper parent, which is why band-matching matters more than chasing the highest-name parent you can find.
Watch: Horse RNG in action
I recorded this 12+ hour gameplay walkthrough alongside the notes on this page. The video shows the exact breeding, racing, and food decisions I describe — useful if you prefer watching a real session before reading the tables.
Methodology: How the 25-Cell Matrix Was Built
The 10 within-band and near-tier cells (SSS×SSS through B×B) come from direct community tracking data: fan wiki aggregates, Discord breeding-result channels, and my own 80-cycle log. Each of those cells has at least 15 community-reported outcomes backing it.
The remaining 15 cross-tier cells (SSS×B, SSS×C, S×C, A×C, B×C with symmetry removed) use a mathematical averaging model: the foal probability for a cross-tier pair is interpolated between the two nearest within-tier rows, weighted by the tier gap. This is the same method community analysts use when they post "cross-band rules of thumb" in the Horse RNG Discord.
The limitation is clear: interpolated cells are estimates, not measurements. If you notice a consistent pattern in your own cross-tier breeding that differs from the matrix, I want to hear it — data from real players is what improves this table. The source notes for each cell are in a companion spreadsheet; contact details are on the About page.
Now you know the complete matrix, what's next?
Community probability data
Cross-check the matrix numbers against community-sourced odds before planning a sustained breeding run.
Put the matrix to work
Take the best parent pair from the matrix and build a food-gated breeding plan around the sleep timer cost.
Value the target foal
Once the matrix shows your best SSS path, verify the foal tier actually earns back the food and wake cost.
Verify the underlying data
Check breed names and tier classifications against the source hub before committing to a multi-cycle chase.