I wonder if somebody can give epd file of positions

[Uri Blass]

oredered based on popularity.

Most popular is the opening position that appear in all games.

Later come the positions after 1.e4 and 1.d4 when everyone of them appear in more than 20% of the games appear in significant part of the games.

I think that it will be nice if for testing chess engines people have the list of chess positions based on popularity and it may be intersting what is the most popular not drawn chess position based on human games(maybe some positions that were popular before 2000 and only with the help of engines of today people discovered that they are losing for one side).

[Dann Corbit]

Code: Select all

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -
rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq -
rnbqkbnr/pppppppp/8/8/3P4/8/PPP1PPPP/RNBQKBNR b KQkq -
rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR w KQkq -
rnbqkb1r/pppppppp/5n2/8/2PP4/8/PP2PPPP/RNBQKBNR b KQkq -
rnbqkbnr/pp1ppppp/8/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R b KQkq -
rnbqkbnr/pppppppp/8/8/8/5N2/PPPPPPPP/RNBQKB1R b KQkq -
rnbqkb1r/pppppppp/5n2/8/3P4/8/PPP1PPPP/RNBQKBNR w KQkq -
rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPP1PPP/RNBQKBNR w KQkq -
rnbqkbnr/pppppppp/8/8/2P5/8/PP1PPPPP/RNBQKBNR b KQkq -
r1bqkbnr/pppp1ppp/2n5/4p3/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq -
rnbqkbnr/ppp1pppp/8/3p4/3P4/8/PPP1PPPP/RNBQKBNR w KQkq -
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rnbqkbnr/pp2pppp/3p4/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq -
rnbqkbnr/ppp1pppp/8/3p4/2PP4/8/PP2PPPP/RNBQKBNR b KQkq -
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rnbqkb1r/ppp2ppp/4pn2/8/2pP4/4PN2/PP3PPP/RNBQKB1R w KQkq -
rnbqkbnr/ppp2ppp/4p3/8/3PN3/8/PPP2PPP/R1BQKBNR b KQkq -
r1bqkbnr/pppn1ppp/4p3/8/3PN3/8/PPP2PPP/R1BQKBNR w KQkq -
rnbqkbnr/ppp2ppp/4p3/8/3Pp3/2N5/PPP2PPP/R1BQKBNR w KQkq -
rnbqkb1r/pp3ppp/4pn2/2p5/2BP4/4PN2/PP3PPP/RNBQK2R w KQkq -
rnbqkb1r/pp2pppp/5n2/3p4/3P4/2N2N2/PP2PPPP/R1BQKB1R b KQkq -

[Uri Blass]

Thanks
I wonder if the order of the openings is based on number of times that the position appeared in games and in this case what is the source of the games.

If I translate the first positions to games I get the following:
1)empty game
2)1.e4
3)1.d4
4)1.e4 c5
5)1.d4 Nf6 2.c4
6)1.e4 c5 2.Nf3
7)1.Nf3
8)1.d4 Nf6

I expected to see 1.d4 Nf6 as more popular than 1.d4 Nf6 2.c4 even if I include the different order of moves 1.c4 Nf6 2.d4(because 1.c4 is not common and white does not have to reply 1.d4 Nf6 with 2.c4)

[Dann Corbit]

The positions come from this view:
CREATE VIEW [dbo].[ContestGames] as
SELECT * FROM dbo.Catchall UNION ALL
SELECT * FROM dbo.Ccc3 UNION ALL
SELECT * FROM dbo.Graham UNION ALL
SELECT * FROM dbo.Grob UNION ALL
SELECT * FROM dbo.ICCF UNION ALL
SELECT * FROM dbo.Playchess UNION ALL
SELECT * FROM dbo.SSDF UNION ALL
SELECT * FROM dbo.Lichess UNION ALL
SELECT * FROM dbo.Scct UNION ALL
SELECT * FROM dbo.Tcec UNION ALL
SELECT * FROM dbo.Junkbase UNION ALL
SELECT * FROM dbo.Ylcet UNION ALL
SELECT * FROM dbo.ccrl4040 UNION ALL
SELECT * FROM dbo.cegt40120 UNION ALL
SELECT * FROM dbo.cegt4020 UNION ALL
SELECT * FROM dbo.cegt4020p UNION ALL
SELECT * FROM dbo.cegt5p3 UNION ALL
SELECT * FROM dbo.twic UNION ALL
select * from dbo.Ccls union all
select * from dbo.mig2004 union all
select * from dbo.Sedat union all
select * from dbo.OmCorr
GO
The tables are filtered for 2500 Elo, except correspondence which is filtered for 2400 Elo.
Catchall contains LiChess, among other things, and so the Lichess will probably dominate because it is huge.

[Dann Corbit]

An important distinction is that it is not a true count of games.
I have a unique index on the contest games tables of position + player.
This gradually becomes a true count of games as you move towards the leaves and very rarely played positions.
So it is an indication of popularity, but for players with a lot of games, there input is reduced in the early positions.