I stumbled over a game with one pair of "3 bamboo" where I could not uncover the second tile of this pair. By playing it several times I was able to uncover all tiles but those under the one visible "3 bamboo". If I find a way to upload the saved game you can try this yourself. Reproducible: Didn't try
Created attachment 76848 [details] unsolvable kmahjongg game
*** Bug 156022 has been marked as a duplicate of this bug. ***
Actually, I managed to solve this game (or at least the game that appears when opening the file). You can get to 3 bamboo in the bottom row from the right with this sequence of pairs: 6 circle (lower right corner/top of stack) 8 character 2 bamboo 7 character 4 circle 3 circle (bottom row/the one left from 4 bamboo) 2 character 6 circle orchid & bamboo sparrow 8 bamboo 3 bamboo To finish the game: red dragon red dragon white dragon green dragon north wind west wind 1 character 5 bamboo 9 character 9 bamboo 2 bamboo summer & autumn 7 bamboo west wind north wind 4 character 5 character (not the one in the lower right) 8 circle 5 circle 5 circle 1 circle (not the one in the lower right) 9 circle (not the one in the upper left) 8 circle east wind south wind south wind 7 circle 4 bamboo 4 bamboo spring & winter 5 bamboo 3 circle 4 circle 2 character green dragon 8 bamboo 1 character 5 character 8 character 3 character plum & chrysanthemum 6 character 7 character east wind 9 bamboo 6 bamboo 9 circle 7 circle 1 circle 2 circle 2 circle white dragon 7 bamboo 9 character sparrow I guess this does not resolve bug #156022 which is marked as a duplicate of this bug.
Game is solvable on KDE 4.14.0 with the above solution. Maybe there was some other bug involved, which is now fixed. Or maybe it was caused by some subtle bug which can not be reproduced with the given information. Or maybe it was solvable in the first place (proving a game unsolvable is much harder than proving a game solvable, at least if not P=NP). However, it is not reproducible now. Therefore I close this bug (while reopening bug #156022, which I can reproduce). Feel free to reopen if you think you have found another unsolvable instance or a game setup that turns the above game unsolvable.