I built a tool for training endgames. What do you think?

Here are some to practice:

blitztactics.com/positions

I finally decided to start learning endgames and found myself setting up positions on Lichess to practice against Stockfish. But I wanted an easy way to reset the position and drill it over and over (because I messed up a lot).

You can also set up any position you want to practice. For example, here's an endgame study Magnus posted on his Twitter a while back:

blitztactics.com/position?goal=draw&fen=4R3/3p4/8/p1k5/8/p3p3/2P1K3/8%20w%20-%20-

I appreciate all feedback, and suggestions for fun/valuable positions to learn :)

i did carlsen one on first try, its not that hard or i got lucky?

btw great site

This looks great—thanks! Endgame theory is a good example of the sort of content that is well suited to this style of drill.

Thats very nice. I was able to do most endgames in the first try except the Vancura position, i failed to do it right a few times. Good to refresh my endgame knowledge here :)

In some positions the computer sometimes moves just back and forth for a while. An avoid-threefold-repetition mechanism could be added here.

Here are some more interesting Pawn ending positions, from chapter 1 and 2 of 'Chess Endgame Training' by Bernd Rosen. If you are interested i post more.

4k3/8/4K3/4P3/8/8/8/8 w - - 0 1
White wins (opposition is irrelevant when the pawn is on the sixth rank already and king is in front of pawn)

8/4k3/4P3/3K4/8/8/8/8 b - - 0 1
Black draws (defending king has to stay on the file of the pawn)

8/2p5/8/1k1P4/8/K7/8/8 w - - 0 1
White draws (sacrifice pawn in order to reach drawn endgame using opposition)

6k1/8/5P2/8/5PK1/8/8/8 b - - 0 1
White wins (sacrifice pawn in order to win the opposition - not the only win)

4k3/8/8/8/8/1P6/8/2K5 w - - 0 1
White wins (key squares)

8/3p4/8/2P5/P3k3/8/8/7K w - - 0 1
White wins (Square rule: block the route of the black king with a pawn sac)

8/8/1p6/p1p5/P1P5/1P4k1/2K5/8 b - - 0 1
Black wins (Opposition)

8/2k5/8/8/6pP/6P1/5K2/8 b - - 0 1
Black draws (Opposition)

2k5/8/p1P5/P2K4/8/8/8/8 w - - 0 1
White wins (another triangulation example - more than one solution)

K7/8/p7/8/8/2k5/P7/8 w - - 0 1
White draws (another example of the reti motif)

8/8/8/5p1k/7P/6K1/6P1/8 w - - 0 1
White wins (win the pawn without letting the black king enter)

8/p4K2/P7/8/8/8/1k6/8 w - - 0 1
White wins (the bodycheck method)

8/8/k1p1K3/2P5/8/8/8/8 w - - 0 1
White wins (drive the black king away from his pawn)

8/8/8/4p1p1/8/5P2/3k2K1/8 w - - 0 1
White draws (another opposition example)

8/8/6p1/1k6/4K3/8/5P2/8 w - - 0 1
White wins (another bodycheck example)

8/8/8/8/8/P4p2/k6K/8 w - - 0 1
White wins (the anti-reti study)

8/8/8/8/k7/P1P2p1K/1P6/8 b - - 0 1
Black draws (another example of the reti motif)

6k1/8/3K2p1/8/6P1/8/8/8 w - - 0 1
White wins (the Zig Zag manoevre)

6K1/8/6k1/8/8/p7/P7/8 w - - 0 1
White draws (unusual King move)

8/8/7k/8/1p6/7K/2P5/8 w - - 0 1
White wins (another unusual king move)

2K5/k7/7p/8/8/8/6P1/8 w - - 0 1
White wins (the queen of bodycheck studies, very difficult)

You can check these endgames with http://www.shredderchess.com/online-chess/online-databases/endgame-database.html

Great!
Thank you for the link @flamehead

It's a nice tool, I'll try it.

In this post you have a link to a huge database of well organized endgame positions (each one with a link to play it within lichess):

es.lichess.org/forum/lichess-feedback/endgame-training-3?page=1

Inspirated in that database I started to develop an android app to practice the positions offline:

chess-endgame-trainer.firebaseapp.com/chessendgames.apk

Well, i'm lucky with the links this morning, thank you @supertorpe .

#1 : If you want more positions to train, you can use my work ( positions selection) here : github.com/ornicar/lila/issues/817

@Vinvin#9 , thank you for the endgame positions!, i've just dowladed your zip. Let's learn now :)