The dumb pawn

Once there was a white pawn who suddenly realized that he was the last piece remaining on the chess board. After a while, he realized that you need other pieces to play a game.

So, he just wanted to go home. But walking home would take a whole day. He checked his wallet to see if he had enough ducats left to buy a train ticket, but he didn't.

In this moment two knights came along, a ♘ and a ♞, and they saw the sad pawn sitting on the square of the white king.

The ♘ asked him why he would not leave for home. The pawn told the knights about his situation and asked them if they would carry him home for the ducats he had left.

The ♘and the ♞ looked at each other. Then the ♘ turned to the pawn and said: "Well, this is not enough money for us to take you home, but how about a business offer? I want you to run to the other side of the chess board and then back to us, as fast as you can. If you manage to do so, I will double up the money you have! And you can run up and down the board as often as you want to!" The pawn listened carefully while the ♘ added:  "But, after each run you have to give exactly 24 Ducats to the ♞!" The ♞ looked a bit surprised but the ♘ continued: "Do we have a deal, pawn?"

"Indeed, we have ♘! Thank you so much!" said the pawn, very happy about the generous offer.

The pawn ran as fast as he could to the other side of the board and then back to the ♘♞s. Maybe he could make a lot of ducats like this!

When the pawn came back to the knights, the ♘ doubled the amount of ducats the pawn had, and with a smile the pawn gave 24 ducats to the ♞.

Immediately after this exchange of ducats, the pawn started to run to the other side of the chess board and back to the ♘♞s again. The second time he was a bit more exhausted.

The ♘ again doubled the money the pawn had and the pawn again gave 24 ducats to the ♞. The pawn then stopped for a moment to catch his breath and to count his money. It still was not enough for a train ticket.

But after the pawn came back the third time, gasping desperately for air, the knights started to laugh.

As soon as the pawn received double the amount of the money he had and gave 24 ducats to the ♞, he also realized why they were laughing: he had exactly zero ducats left.

But then both knights apologized for letting him run all the time and gave him all his money back. Then they took him home on their backs and the story came to a happy end.

The question is:

How many ducats did the pawn have before he started to run the first time across the chess board?

Solution of the "Slowest Knight" riddle

This puzzle was a bit different but did not require too much mathematical knowledge.

Most of you got it correct and I have to thank  JoshuaVGreen  for always being very engaged in the puzzles and coming with new ideas.

The best solution would be to exchange the knights, then take the bishop on g3 and try to liquidate into an endgame with the isolated pawn, while the...sorry...

I meant a very good solution is to swap the horses of the brothers!

Links:

• Logic riddles for chess players part 1
• Logic riddles for chess players part 2
• Logic riddles for chess players part 3
• ChessBase tactic section