Opening Principles, by Win Rate
“Develop your pieces, fight for the center, get your king safe” is standard opening advice, usually stated as general wisdom rather than something anyone checks. This page checks a version of it this site’s own data can actually answer: among the real replies players make at 1600-1800 against the 10 openings this site tracks, do moves that match one of the three classic principle patterns score differently than moves that don’t?
How this page defines each principle
Every move below comes from real Lichess Opening Explorer data already fetched for this site’s own opening pages. Nothing here is a hand-typed statistic or an engine judgment about any specific position. Classification is by notation pattern alone, disclosed in full:
- King safety: the move is castling (O-O or O-O-O).
- Development: the move is a knight or bishop move (SAN starts with N or B) — develops a minor piece off the back rank.
- Center control: the move is a pawn push straight to a central file: c, d, or e (SAN is exactly a c/d/e file letter plus a rank, e.g. "d4" or "e5"; pawn captures and flank pawn moves like a3/h6/g6 don't count — see "What this doesn't classify" below).
What this doesn’t classify: queen moves, rook moves, king moves other than castling, piece captures, and flank pawn moves (a-file, b-file, f-file, g-file, h-file) all fall outside these three patterns and are left unclassified rather than guessed at. That’s a real limitation of a notation-only rule; it says nothing about whether those moves actually matter.
How principle-matching moves actually score
Across every classified reply move found in this build, aggregated by category (score is for the side making the move, weighted by games):
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| Category | Moves matched | Games | Avg. score for the mover |
|---|---|---|---|
| King safety | 0 | 0 | no data in this build |
| Development | 30 | 19,265 | 48.9% |
| Center control | 18 | 11,458 | 49.6% |
The moves themselves, best-scoring first
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| Opening | Move | Category | Played | Score |
|---|---|---|---|---|
| Scotch Game | Bd6 | Development | 1.3% | 60.0% |
| Scandinavian Defense | d4 | Center control | 2.0% | 57.5% |
| Caro-Kann Defense | d3 | Center control | 2.5% | 55.9% |
| King's Indian Defense | Nf3 | Development | 10.2% | 55.6% |
| King's Indian Defense | Bg5 | Development | 1.7% | 55.5% |
| London System | c5 | Center control | 7.3% | 54.2% |
| Italian Game | Be7 | Development | 5.3% | 54.1% |
| Caro-Kann Defense | Nc3 | Development | 6.9% | 53.4% |
| Scandinavian Defense | Nc3 | Development | 3.5% | 52.8% |
| Sicilian Defense | Nc3 | Development | 8.7% | 52.4% |
| Scandinavian Defense | Nf3 | Development | 5.8% | 51.6% |
| Caro-Kann Defense | d4 | Center control | 43.4% | 50.8% |
Does it show up across rating bands?
The per-move classification above only has this level of detail at 1600-1800. This build only fetches per-move reply data for that one band (the same limitation the common-mistakes page discloses). As a proxy for whether that matters by rating, here’s how much each opening’s own score for the featured side moves between its lowest- and highest-scoring tracked band, next to how many principle-pattern replies were found against it:
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| Opening | Principle-pattern replies found | Lowest band | Highest band | Range |
|---|---|---|---|---|
| London System | 6 | 1600-1800 (52.7%) | 1400-1600 (55.4%) | 2.7 pts |
| Ruy Lopez | 5 | 2000+ (51.8%) | 1400-1600 (54.3%) | 2.5 pts |
| Italian Game | 4 | 1800-2000 (50.7%) | 1400-1600 (53.0%) | 2.3 pts |
| Caro-Kann Defense | 5 | 1800-2000 (49.2%) | 1400-1600 (50.9%) | 1.7 pts |
| Scotch Game | 4 | 1400-1600 (53.9%) | 1800-2000 (55.2%) | 1.3 pts |
| Sicilian Defense | 5 | 2000+ (48.9%) | 1600-1800 (50.1%) | 1.2 pts |
| French Defense | 5 | 1400-1600 (49.3%) | 1600-1800 (50.2%) | 0.9 pts |
| Queen's Gambit | 5 | 1400-1600 (53.7%) | 1800-2000 (54.5%) | 0.8 pts |
| Scandinavian Defense | 4 | 1600-1800 (49.3%) | 1400-1600 (49.6%) | 0.3 pts |
What this doesn’t show
This measures whether a move’s notation shape correlates with its own score, and whether that shows up in how much an opening’s overall score varies by rating. It doesn’t measure whether a specific position is objectively sound, and it can’t tell you what a strong player would actually recommend in any one of these lines. A move matching “development” here is only classified by shape — whether it’s actually good in that specific position is a separate question this page doesn’t evaluate.
Go deeper
See the most common opening mistakes across all tracked openings →, or the full openings comparison → for every band at once.