1st game:
4. Nb5?! is not good. It moves a piece twice before you finish development, and puts it on a more vulnerable square it can be chased from when it was sitting fine on c3. Also note that black's e5-pawn is hanging; thus 4. Nxe5 is the better move here with a free pawn. 4. Nxe5 Qe7 5. d4 keeps the pawn.
As you see, immediately 4...c6 attacked your knight, and if 5. Nc3 d5 would give black a good position. Even so that may have been better than hanging your e4-pawn back.
8. 0-0 is preferable, getting your king safe. Re1 with tempo may be helpful too.
9. Bxd4? is a losing blunder. 9. Nxd4 is the safe recapture. In general, you should have alarm bells ringing in your head whenever your opponent can make a discovered check or attack, and always calculate if you can get away safely in allowing it to pass.
A piece for a queen is just about hopeless. It is quite fortunate you lasted long enough to have decent counterchances; on your opponent's side he failed to develop his queenside pieces and wasted time with moves like 12...c5, 14...f5, 16...f4 and especially 24...h5. On your part 16. b4 was good.
Then you missed a weak chance with 25. Reg1 threatening mate, e.g. 25. Reg1 bxc5? 26. Rxg7+ Kf8 (26...Kh8 27. Nf7#) 27. Rf7+ Ke8 28. Rg8#. Black's best response is 25. Reg1 Qxg1 26. Rxg1 bxc5, which leaves you just a piece and 2 pawns down which is still lost, but less lost.
Despite the amazing piece activity around black's king, I can only see one solid missed chance: 46. Bg5+ Kh7 47. Nf6#. Aside from black allowing that, he was in control most of the time.
Second game:
6...Nxe4? is a losing blunder already. 5...Nxc4 or 6...Nxc4 were good chances to get the bishop pair and put white's queen somewhere awkward. Instead you walked into 7. Bd5 where even 7. Bd5 Bb7 8. Bxe4 or 8. Bxb7 Nxb7 9. Qxd4 wins.
7...b5? just made things worse as 8. Qxa5 is resignable for black.
Then after that, no real chances for the rest of the game. White didn't defend the best way; 20. Bh6! or 24. g3! are strong for instance.
26...Nc4 wasn't a losing blunder, as the game had been lost much earlier. 23...Rh2?! was optimistic but I'm inclined to call that a mistake. Of course the fatal error was before move 10, as losing a piece (could have been two) is usually lethal.
Hi. I am not a good player and I would like to improve. I will show you two games that I lost. I chose these two because in both I made huge mistakes. Mistakes that made me much weaker than the opponent. In the future I will try to play better and avoid moves like that.
But after I made these mistakes I tried to win by attacking the opponent and leaving the king vulnerable. At that point I was convinced I would lose anyway, so I started to attack. And I lost even though I thought that I still had a chance.
This happened in both games.
In the first game I played with white pieces.
And this is the second game where I played with black pieces.
I wonder what do you think about the opportunities I had. Could I still have won?
What is your opinion about these two games?