I was testing Scan's endgame technique in International draughts by comparing human approach and AI approach. There is a nice puzzle by Noome and Hortsman (I quote their names by cyrillic retransla…

Also, the moves 24-19 and 26-21 can be played in either order.

Though the proposed solution (1.27-21 2.28-23) is optimal, the suboptimal solution 1.28-23 is also clearly winning. Hence, I do not think this is a great puzzle.

1.25-20 24x15 and now the move order 2.33-29 3.27-21 is also winning.

1..16-21 2.27x16 18-22! is also winning

it's ok,thanks you the difference it's after 1. 21-27, and so on,he can take 16*27 instead of 23*32 because of 21-26. and I didn't see 13-18 and 08-13 while white take 5*37

https://lidraughts.org/training/840 after 21-27 scan consideres the position equal (-0.1). it takes a few moves, but the capture of the king seems inevitable, resulting in a 7 against 7.

After the 21-27 line you cant protect your king afterwards, resulting in an even position.

1 ... 21-27 is also good

after 27-21 and 33-39, the move sequence 30-34, 48-43 and 42-38 also lead to a winning position.