I know this isn't technically a replay, but even though I dreaded the idea of doing so, I played the original game's version of TSK20, and I won it in 42 minutes. It was VERY EASY in comparison to r5503, but it was more time consuming based on the approach I took. However, I have no doubt it can be finished several minutes earlier using my approach more efficiently than how I actually executed it. Since I can't show a replay, I will share my winning plan!
But first, here's the .sav file for proof of this time.
cmowla TSK20 TPR in 42m.zip
Was the 50m polish record with this version of the game?
Plan
The following steps will help you avoid the initial battle (except you will have to lose one group of 12 swordfighters) and keep the AI away from your storehouse and serfs.
[1] Move the left-most barb group to the left, and move the right barb group down. This saves all barbs from initial attack.
[2] Move your 2 pikemen groups and the swordfighter group next to them left (at least to the middle point of the iron mountain about your storehouse). Move your knights south, circle them around the bottom of the gold mountain, and send them up to the north drawbridge where your ally will go (if your ally decides to go to the right village instead, start over).
So, at this point, you should only have your group of 12 swordfighters (which were originally above the golden ore mountain) left there (DO NOT MOVE THEM, let them die).
[3] Move all of your troops (except for your knights) by your storehouse and feed all of them. Feed the pikemen first, and send them up north, south of the drawbridge...knights from the south will eventually come.
The following steps will be used to kill all serfs (in all villages) before the 20 minute mark.
[4] At the north village drawbridge, your ally will be entering on the right side of the bridge. Break your group of 12 knight into 2 groups of 6, have one group enter to the village between the first storehouse and the river. Kill the nearest serf, and leave one knight there to die. Send the remaining 5 to kill all serfs in this village.
[5] When I played this, I only had 1 surviving knight, not 5. In fact, I believe I sent my second group of 6 knights in to finish the job the first group should have done before they got killed. One is sufficient to kill all serfs in the left and right villages (at this point, I think there were only 5-6 serfs in both villages, and the schoolhouses are still training other units besides serfs). So this is step 5. Make sure that at least one knight survives so you can use him to dodge stones from watchtowers and kill xbowmen!
[6] Send the rest of your (now fed) troops where your pikemen were placed for step [3]. Serfs from the northern-most village will be coming south to feed the troops you dodged in the initial attack. Kill them all, and that's the end of the serfs!
The rest should be self-explanatory. Starvation, battle tactics, even distribution of troops to AI buildings to win in the optimal time. The AI is dumber than I thought. 
I do miss their swordfighters storm attacks (which doesn't happen in the remake).
You do not have the required permissions to view the files attached to this post.