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.
The start position is 6K1/5p2/5Pk1/6p1/3pP1P1/8/8/8 w - - 0 1 ; 8-men
White plays e5, e5, exf7. with this capture, it becomes a 7-men TB position. Instead of recognizing the move as correct (all the others draw), the website displays an error, an "unfeasible mate" message, and black plays a nonsensical Kh6 move allowing a trivial mate in 2;
https://chess-endgame-trainer.firebaseapp.com/position/1/5/0
The start position is 6K1/5p2/5Pk1/6p1/3pP1P1/8/8/8 w - - 0 1 ; 8-men
White plays e5, e5, exf7. with this capture, it becomes a 7-men TB position. Instead of recognizing the move as correct (all the others draw), the website displays an error, an "unfeasible mate" message, and black plays a nonsensical Kh6 move allowing a trivial mate in 2;