After my "wet dream" comment on DK Transformations post, I received form three sources the Chessbase files with all positions from Polgars "5334 problems, Combinations, and Games". The first one from someone who prefers to stay anonymous, the second from one of the knights and the third from Blue Devil Knight, who gave me a link to a source still available on the Internet. To all of them I want to express my gratitude and appreciation.
Both the anonymous sources also gave me chessbase files of Polgars Middlegame Brick. But these files are not complete. although I got several versions they all appear to come from the same source, because all of them contain only the first 1.000 positions.
Therefor I would like to make the following proposition to anyone who is interested and willing to put some time into creating a great file to practice your combinational skill. If we can find 10 people who are all willing to put in the effort of transferring 500 positions with solutions of the middlegame brick into chessbase, we can share these files and create a complete electronic version of the middlegame brick.
furthermore I propose to make files that help with training visualisation. I think a lot of us could benefit from training with positions in which the next 6 to 8 moves are given. These moves are not to be played however. You have to visualise them. As soon as the given notation stops there is a winning move. This move you have to find yourself. Again these positions will be made available in chessbase format.
A great source for games from which we could extract these positions, would be the under 12 section from a national youth champions tournament. These games are almost all decided by tactical means which are not very complicated. If we can form a group of ten, and everybody does 50 exercises, we again would create great training material for each other. I will provide the games. It will not be much work to make an exercise. You scan a game with an chessengine, and go to the last move before the decisive move (the move that has the changes the computers evaluation the most). This is the last move of the sequence given in the exercise. From that position you go back 6 to 8 moves, to get the starting position of the exercise. I would make exercises for myself this way, if making the exercises would not frustrate solving them (because I would have allready seen the solution). Therefor sharing is essential! Anyone who is interested can email me. I also would welcome other suggestions to make practice and trainingmaterial, by email, or in a comment.