Winning with the Kadas Opening: Beginner's Trap

White wins using the Kadas Opening: Beginner's Trap.

Can someone explain the reasoning behind 51... e4?  

The point behind 51. ... e4 is that it frees up black's position. It is a positional pawn sacrifice, quite a desperate one at that, designed to simply open black's rook and try to gain as much activity as possible. Looking at the position after 51. Bb4, black's bishop is hanging, he has two very passive rooks and a very weak bishop against 3 active and powerful minor pieces and a strong rook. e4 is probably the best move in the position, no other move is helpful and if he continues to play without this move black will simply get completely crushed positionally by any strong opponent. His bishop has no good retreat and therefore must be traded, he has no way to penetrate white's position, and no way to kick white's extremely powerful d5 knight (c6 at any point will fatally weaken the b6 pawn). e4 is a forcing move, as 52. Bxb4 exf3 black has some potentially unpleasant counterplay on the kingside. After Bxe4, while it is true black has dropped a pawn, the newly opened f-file for his rook allows some desperately needed activity along the second rank and f-file after Rf2+ which was previously not possible due to the presence of the bishop on f3. Black's e-pawn was also isolated and weak anyways, and the semi-opening of the e-file in that direction is only helpful to black and this actually somewhat puts black back in the game, although he did end up still getting crushed. Hope this was a helpful answer, another idea to keep in mind is that white's pawns are all weak and isolated anyways, but they cannot be exploited at all with black's rooks on such useless squares, therefore e4 was the best move and there was no other way for black to get activity and even to fight for a draw

What about the reasoning behind 44... Qxb4? It just loses a knight.

Where else can the queen go?

What was the time control because I did not think Houdini (Black) would be able to lose after the first 2 moves.

Am I missing something here? That is a horrible opening by white. 

And 2.Rh3 makes no sense, giving up the exchange with no compensation.  It looks as if Houdini was set to look only 1 ply ahead.

I always start with pawn to h4 and then rook to h3. Does anyone have any better openings? For beginners?

Absolutely baffling, doesn’t even look like chess. Definitely not 3k strength Houdini.

I need to know a counter for this opening. I'm studying this opening and I'm kind of hoping to learn how to play it correctly and how to counter it correctly

IMHO, the Kadas is not for beginners. It takes advanced skills to undo the damage of a bad opening. 

At the age of 14 as a complete novice playing intuitively (without study) I had my first competitve game at our local chess club; my opponent was a much older player and I assumed was a more experienced player so I decided that I should open with a move that he would not expect. I played 1h4 and as I recall used some form of pawn storm. I caught him by surprise and equally surprising I won my first game quite easily. Now in my retirement I have returned to chess with great pleasure, and I have today looked into my surprise attack ; I was pleased to read that one of the names given to this opening is Harry's opening . So I used this opening in 1962 !