Opening novelty
A50 · Mexican Defense
48th Arco Open 2026 · October 6, 2026
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Novelty metrics
- Eval Quality
- Mid64%
- Practical Difficulty
- Low9%
- Strategic Shift
- Low0%
- Plan Shift
- Low13%
- Imbalance
- Low0%
- Theory Impact
- Low12%
- Sharpness
- Low41%
How to read these metrics
High does not always mean better. Each metric describes a different aspect of the novelty; for example, high sharpness means a more double-edged position.
Eval Quality
How the engine grades the novelty's objective quality.
Practical Difficulty
How tough the response is for a human at the board, with no preparation.
Strategic Shift
How much the long-term character of the game is changed by the novelty.
Plan Shift
How much the opponent must abandon their habitual plans after the novelty.
Imbalance
Whether the novelty trades material for real compensation.
Theory Impact
How disruptive the novelty is to known opening theory.
Sharpness
How sharp the resulting position is, and how easily either side can go wrong.
Go beyond the position
Replay the full game, explore the lines with Stockfish, and save this novelty.
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