I had the same situation several times. I could jump an opposite piece in two directions but the computer enforced only one. As if it had something to do with the opposite piece's previous move. (E…

Puzzle 1438: 33-29 39-33 30x50 38-32 48-43 also wins After being told 33-29 was not the correct move, I continued looking and found the intended solution, which is very nice. I didn't see that aft…

Puzzle 1366: after 38-32 the moves 35-30 and 26-21 can be played in either order, but only 35-30 first is accepted.

Puzzle 663: 38-33 without 37-31 is also winning.

Puzzle 646: 1. 26-21 is also winning. Puzzle 1435: 1. 43-38 is unfortunately also winning. Puzzle 1626: 2. ... 2-7 is also quite comfortably winning. Puzzle 1838: great tactic, would be even better…

Puzzle 1726: 3. 43-38 is also winning. It's not quite as good as 44-39, but it makes the final shot even better.

Puzzle 2155: 1. 38-32 27x47 2. 37-31 47x20 3. 26-21 is also winning.

Frisian puzzle #22: Alternative solution 1. .. 18-23 (natural idea which comes into mind because of many holes) 3. 24x4 (maximum capturing rule) 13-19 (free tempo) 3. 4x36 (king's primacy rule) …

There is an alternative solution, although it is a bit longer, but the tactical motif can be spotted easier: 1.48-42 37x48 2.17-12 7x18 3.15-10 5x14 4.44-39 48x34 5.35x4 18-22 6.4x27 36-41 7.27-31 …

Puzzle 1059: 7. 38-33 has been brought up before, but it's still marked as incorrect.