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supertorpe / chessendgametraining

Chess Endgame Traininng: app to practice a variety of well organized set of chess endgames. From elementary to the most complex endgames, you can practice until you learn how to face all of them.
https://chess-endgame-trainer.mooo.com
GNU General Public License v3.0
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Mistake for position/1/4/5 ? #28

Closed PiR43 closed 3 weeks ago

PiR43 commented 4 years ago

It seems this problem has no solution: https://chess-endgame-trainer.web.app/position/1/4/5 Perhaps not a checkmate but a draw ?

j-krl commented 4 years ago

There's quite a few problems where the hint gives unfeasible mate. Looks like the issue is bigger than just one problem.

supertorpe commented 4 years ago

The positions were obtained from a database with the target of each position (draw or mate). It appears that this database is not 100% reliable. Therefore, I started to develop a program to verify each and every one of the positions (against tablebases when possible, and with stockfish in all other cases) to check: 1) if the target should be draw or mate and 2) the minimum number of movements required to achieve the target.

supertorpe commented 3 weeks ago

Position updated as "draw"