"It does this by running 2000 positions from random games and noting how often the moves agree and as output returns the percentage of moves that match."
https://komodochess.com/downloads.htm
https://komodochess.com/pub/sim03_win.zip
This is a simple test w/ default settings. Results should be easy to replicate. Basic questions are: which engine (or engines) is engineX most similar to? Out of 2000 positions, how often (what percentage?) do the two engines agree on best move?
NNUE engines w/ a high similarity to Stockfish (of engines tested):
NNUE engines w/ a very low similarity to Stockfish:
More: (click to view)
| Stockfish-14.1 | 64.70% | ShashChess-20.1 |
| ShashChess-20.1 | 64.70% | Stockfish-14.1 |
| Stockfish-15 | 64.31% | Stockfish-14.1 |
| Stockfish-13 | 63.91% | Eman-7.00 |
| Eman-7.00 | 63.91% | Stockfish-13 |
| Stockfish-10 | 62.96% | SugaR-1.6 |
| SugaR-1.6 | 62.96% | Stockfish-10 |
| Stockfish-9 | 60.55% | Stockfish-10 |
| Stockfish-11 | 60.39% | Stockfish-10 |
| Stockfish-12 | 59.97% | Stockfish-13 |
| Stockfish-8 | 59.55% | Stockfish-9 |
| Nemorino-6.00 | 56.60% | Stockfish-12 |
| Seer-2.5.0 | 56.42% | Koivisto-6.0 |
| rofChade-3.0 | 56.39% | Stockfish-13 |
| Fat-Fritz-(in-lc0) | 55.66% | Lc0-v0.28.0 |
| Lc0-v0.28.0 | 55.66% | Fat-Fritz-(in-lc0) |
| Clover-3.1 | 55.61% | Koivisto-6.0 |
| Koivisto-6.0 | 54.30% | Stockfish-13 |
| Berserk-4.6.0 | 53.68% | SugaR-1.6 |
| Rebel-15 | 53.57% | Koivisto-6.0 |
| RubiChess-2.2 | 53.12% | Eman-7.00 |
| Wasp-5.00 | 52.76% | Koivisto-6.0 |
| Ethereal-13.07 | 52.90% | Stockfish-10 |
| Uralochka-3.37c | 52.88% | Seer-2.5.0 |
| Ethereal-11.50 | 52.61% | Berserk-4.6.0 |
| Igel-3.0.5 | 52.20% | Stockfish-13 |
| Ethereal-10.55 | 52.05% | Stockfish-8 |
| Ethereal-12.75 | 51.65% | SugaR-1.6-64 |
| Minic-3.22 | 51.60% | Seer-2.5.0 |
| Komodo-13.02 | 51.18% | Stockfish-9 |
| Fire-8.2 | 45.01% | Stockfish-8 |
| SlowChess-Blitz-2.9 | 44.72% | Lc0-v0.28.0 |
| Fire-8.NN | 43.34% | Stockfish-12 |
| Tucano-8.00 | 32.34% | SlowChess-Blitz-2.9 |
| Fire-zero | 31.88% | Lc0-v0.28.0 |
| Mayhem-6.3 | 30.84% | Fat-Fritz-(in-lc0) |
