Thanks to Tradersean for providing this puzzle.
In this game, you are Yellow and Green (Yellow is dead), and are trying to win the end-game. Be aware that Blue and Red both still have moves that can be made, and you should try to have them make the best moves possible given your choices, so this puzzle requires some playing-around.
The pentobi file with the problem is here (link: http://dl.dropbox.com/u/27727822/Puzzles/IntermediateEndGame/IntermediateEndgame-Problem.blksgf)
The pentobi file with the solution is here (link: http://dl.dropbox.com/u/27727822/Puzzles/IntermediateEndGame/IntermediateEndgame-Solution.blksgf)
The image is below. As well are some links to the puzzle and two solutions (one the same as above) in an older format.
The problem .blk is here. (http://dl.dropbox.com/u/27727822/Puzzles/IntermediateEndGame/IntEndGameProblem.blk)
The original solution provided by Tradersean is here. (http://dl.dropbox.com/u/27727822/Puzzles/IntermediateEndGame/IntEndGameSolutionTSean.blk)
The solution I came up with is here. (http://dl.dropbox.com/u/27727822/Puzzles/IntermediateEndGame/IntEndGameSolutionIWK.blk)
Feel free to send me more solutions you come up with.