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Doubled pawns: in 14 flavours

The position shown as an example of a double pawn after fxe6 does not indeed look well for black. But there is also another frequent case: after a bishop trade on e6 in Italian where the position does not look so bad. If black has already castled, the rook on f-file can become quite dangerous; also the e6 pawn can be used to support d5.
You're absolutely right mkubecek. It's not in the blog but I did include an example in chapter 18 of the study (see link below) with the Italian trade you mention, actually for White in this one. This structure usually has pluses and minuses and so is much closer to equal:
The Hidden Laws Of Chess (Nick Maatman) chapter 2 is all about doubled pawns.
As our resident comedian... what about tripled pawns? :-)

But seriously, by now enough chess games have been played that it's possible to do some research about positive effects of tripled pawns and how to use them effectively. It might not be worth doing the research, but it's possible if anyone wants to do it.
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Hi Climberek - I don't know of any way to do it in Lichess. If you have ChessBase then you can search with games with a position with pawns on h7 and h6 using the advanced filter. I just tried that and it gave me 35,000 or so games out of the 10 million or so games on the Mega database. It might also be possible with other database programs.