5. d3 was a mistake. The most common move in that position and the best move is c3 because it prevents the black knight from moving to d4 where it can not only threaten the queen, threaten a fork but stay in a good outpost until pushed away.
12. Qf3 was a mistake. The f3 square would have been a great place to develop your knight, and a general rule of thumb is to never move the same piece twice in the opening until both your knights and bishops have been developed.
17. d4 was a mistake. Your pawn structure was quite good and your opponent had doubled up pawns and a weak dark squared bishop. You traded a good knight for a bad bishop, got rid of his doubled up pawns and slightly ruined your own pawn structure by playing moves 17 and 18.
20. Qe2 was a mistake. This would have been a perfect opportunity to develop your knight to c3 and if he pushes it away with 20... b5 you could have played 21... Rd1, forcing him to move his queen away and then moving your own knight to safety.
By move 22 you had only just developed your knight, when you are supposed to develop both knights in the first 5 moves.
24. Bxc3 was a mistake. There is a thing called an "inbetween move" where, rather than recapturing immediately, you can make a threat, force your opponent to respond to that threat and then play what you would usually have played. In this case, 24. Qc6+ would have been best as it doesn't quite fork his rooks when his king moves and allows his rooks to double up, but it does check him, centralise your queen and defend your e4 pawn at the same time. It also allows you to play 25... Bxc3 if you want once he has responded to the check.
32. hxd5 was a mistake. When you are winning, you need to think simple. If you had just played Qxd5+, then he would have been forced to trade queens and you would be a rook ahead which would have been a very easily won endgame for you.
34. Re3 was a mistake. If you had simply played 34. Kh2, you could have protected the pawn without the cost of risking a perpetual check.
Moves 35 to 55 were mostly poorly played. I won't list all of them, but there were many cases where you could have ended the constant checks. For example on move 38, if you had only played Rf3, the game would be quickly over. Not only does your opponent miss out on a perpetual check, but you threaten checkmate by Qxf7#. Your opponent might have played Qd7 to prevent the checkmate and protect the pawn at the same time, of which case you could play 39. g6!, piling on the pressure. If your opponent instead played Ke8, you could just capture the pawn for check and he would be in a very dangerous position.
Move 66. Ra7+ was a mistake. Better would have been 66. Ra6 followed by 67. Rxf6. Considering how long the game was, there was no excuse for a stalemate in such an easily won position.
Very describing, but I am black! :D
Wow I'm so stupid! I wrote all that for nothing :(
Actually it wasn't written for nothing... I read and analized everything here to see what are you guys talking about in order to improve my chess since I'm a noob...
5. d3 was a mistake. The most common move in that position and the best move is c3 because it prevents the black knight from moving to d4 where it can not only threaten the queen, threaten a fork but stay in a good outpost until pushed away.
12. Qf3 was a mistake. The f3 square would have been a great place to develop your knight, and a general rule of thumb is to never move the same piece twice in the opening until both your knights and bishops have been developed.
17. d4 was a mistake. Your pawn structure was quite good and your opponent had doubled up pawns and a weak dark squared bishop. You traded a good knight for a bad bishop, got rid of his doubled up pawns and slightly ruined your own pawn structure by playing moves 17 and 18.
20. Qe2 was a mistake. This would have been a perfect opportunity to develop your knight to c3 and if he pushes it away with 20... b5 you could have played 21... Rd1, forcing him to move his queen away and then moving your own knight to safety.
By move 22 you had only just developed your knight, when you are supposed to develop both knights in the first 5 moves.
24. Bxc3 was a mistake. There is a thing called an "inbetween move" where, rather than recapturing immediately, you can make a threat, force your opponent to respond to that threat and then play what you would usually have played. In this case, 24. Qc6+ would have been best as it doesn't quite fork his rooks when his king moves and allows his rooks to double up, but it does check him, centralise your queen and defend your e4 pawn at the same time. It also allows you to play 25... Bxc3 if you want once he has responded to the check.
32. hxd5 was a mistake. When you are winning, you need to think simple. If you had just played Qxd5+, then he would have been forced to trade queens and you would be a rook ahead which would have been a very easily won endgame for you.
34. Re3 was a mistake. If you had simply played 34. Kh2, you could have protected the pawn without the cost of risking a perpetual check.
Moves 35 to 55 were mostly poorly played. I won't list all of them, but there were many cases where you could have ended the constant checks. For example on move 38, if you had only played Rf3, the game would be quickly over. Not only does your opponent miss out on a perpetual check, but you threaten checkmate by Qxf7#. Your opponent might have played Qd7 to prevent the checkmate and protect the pawn at the same time, of which case you could play 39. g6!, piling on the pressure. If your opponent instead played Ke8, you could just capture the pawn for check and he would be in a very dangerous position.
Move 66. Ra7+ was a mistake. Better would have been 66. Ra6 followed by 67. Rxf6. Considering how long the game was, there was no excuse for a stalemate in such an easily won position.
Very describing, but I am black! :D
Wow I'm so stupid! I wrote all that for nothing :(