The key can be either 1...26-31 or 1...23-29. I was deducted 19 points because it's set to only allow one key. Fix it, please. Also, would love Frisian problems.

Author here. @Jeffrey Congratulations on the draw! Scan probably made mistakes when answering you, however. The version I'm using is slightly different, and plays those moves (even with only…

For some unknown reason Scan doesn't play the right moves. After 7. ... 27-31 ? the position is lost for Black (Dragon Draughts database). Maybe Scan doesn't use endgame database in lidraughts ? Anyw…

1. ... 37-31 is also good

@Tim I found this problem in puzzle 292 yesterday as well. We will disable it and put the same puzzle back in with all the correct solutions. (like for example puzzle 361, where now both 27-21 and 31-…

I have understood this: memorizing the first 10 positions (the squares from 1 to 10) it is easy to improve by counting, for example, from the square number 1, +10 to obtain the square number 11; + 20 …