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  3. Can someone explain why I started losing in this game?

I was playing this game - I was Black and I thought I was making all the correct moves. But towards the end, I just started losing. Can someone explain both why I started losing and what I should have done instead?

1. d4 Nc6 2. Nf3 d5 3. c4 e6 4. a3 dxc4 5. Nc3 Bd6 6. Qa4 Bd7 7. Be3 Nxd4 8. Qd1 Nxf3+ 9. gxf3 Qh4 10. Ne4 Be5 11. Nc5 O-O-O 12. Bg2 Bxb2 13. Rb1 Bc6 14. Qc2 c3 15. O-O Nf6 16. Na4 Bxa3 17. Qxc3 Bd6 18. f4 Nd5 19. Qa5 Nxf4 20. Bxc6 Nxe2+ 21. Kg2 Qg4+ 22. Kh1 bxc6 23. Qa6+ Kd7 24. Nc5+ Ke7 25. Nb7 { Black resigns. } 1-0

Sorry but I don't know a better way to share my game.

Here's the game and you were not losing at all but were winning and in the final position you had Qf3#!

Also aside from the mate you've got a lot of pawns!

why should the position be losing?just move the rook and he in not threating sorry if i am missing sth

It's common to see skilled chess players (especially online) complain about opponents who insist to play on in a clearly lost position.

@Ripplez, at your current skill level, even if you think a position is clearly lost, I recommend that you play on: for two reasons. Reason number one is that you aren't (yet) skilled enough to judge when a position is clearly lost. Like @solstice021 said, you were doing just fine in that game. The second reason I suggest you play on is because the opponents you'll be playing against will be around your skill level, and are just as prone to making mistakes (to be fair, any opponent is liable to make mistakes occasionally).

In short, you lost because you resigned. You resigned because you thought you were losing, because you didn't evaluate your position correctly. The first step in learning how to evaluate a position is learning about the "Point value" of the pieces. The rule isn't set in stone, but it's a perfect place to start.

The commonly-used "Reinfeld values" of pawn=1, bishop=knight=3, rook=5, and queen=9. In your ending position, white had "24 points" and black had "32 points". With an advantage that big, safely escorting a pawn to the final rank won't be too hard.

I hope everything I said made sense. If you'd like a clearer explanation, I'd be happy to try again.

I see a position where black is up 5 pawns with mate in 1 on the board. Clearly winning. Good game.

If white had found the defense move 25. f4, black is still up 5 pawns... The mistake was letting him kill your fighting spirit. Fearless optimism wins chess games.