Oh Dear, I Errr... Swindled My Opponent Tonight

In a totally losing position, I somehow managed to swindle a win out of my game tonight against Martin van Elmpt (1448). This game was played at G/75 time controls with 75 minutes for 30 moves and another 30 minutes to finish the remainder of the game.

When we reached move 30, I noticed that Martin just made it to time control with 2 minutes to spare. It was at this point ( I had earlier sac'ed a Knight for 2 pawns to get counterplay but it was not enough) that I decided to blitz out my remaining moves and put him under enormous time pressure.

On move 40 with 12 minutes left to complete the remainder of the game, Martin unfortunately blundered (in the diagram shown) by playing

40. Qd5??

leaving his Rook en prise. He resigned less than 10 moves later. When he resigned, I found that he had 10 minutes left while I had 1 hour 15 minutes to play(!). That meant that for 48 moves, I had spent just 30 minutes! Yikes!

Funny, this was one game I actually feel very guilty for winning.

Sorry Martin, I honestly didn't know what to say to you after the game. Hope you'll do better for the rest of the games. Best of luck.

Have you ever swindled your opponent before? If so, what do you say to your opponent, after the game? I feel very sorry for Martin for losing a won game tonight.