lichess-org/chess-openings

Redundant and contradictory entries

berlix opened this issue · 2 comments

berlix commented

I noticed there are some contradictory entries with the same name, for example the Kadas Opening: Kadas Gambit:

A00	Kadas Opening: Kadas Gambit	1. h4 c5 2. b4
A00	Kadas Opening: Kadas Gambit	1. h4 d5 2. d4 c5 3. Nf3 cxd4 4. c3
A00	Kadas Opening: Kadas Gambit	1. h4 e5 2. d4 exd4 3. c3

Also, some entries seem redundant; for example, of the following, I suspect it would be sufficient to only include the final one:

A01	Nimzo-Larsen Attack: Modern Variation	1. b3 e5
A01	Nimzo-Larsen Attack: Modern Variation	1. b3 e5 2. Bb2
A01	Nimzo-Larsen Attack: Modern Variation	1. b3 e5 2. Bb2 Nc6
A01	Nimzo-Larsen Attack: Modern Variation	1. b3 e5 2. Bb2 Nc6 3. e3

Are these intentional? If so, what is the rationale behind them?

niklasf commented

Duplicate entries can be useful to correctly label common transpositions. However that doesn't appear to be the case for these examples, so the useless and/or incorrect (will require some investigation) entries should be removed.

niklasf commented

Ok, so I double checked and:

  • Other sites/sources agree with labeling all the distinct but related openings above "Kadas Gambit".
  • There are transpositions that justify each of the entries for the Modern Variation of the Nimzo-Larsen Attack, except the second. Removing that one.