what did i do wrong :(

this is so sad

help me i cant beat martin

Oof. The main mistake here is advancing the King's Bishop's Pawn so early. When I see an opponent do that I'm always looking to get my Queen to make exactly that Check because I know they've very likely overlooked it.

In this case you couldn't block the Check, so it was Checkmate, but even with a blocker the outcome is usually bad.

There's a case for a broader principal of not advancing any kingside pawns unless you need to in order to prevent Checkmate or a material disadvantage. It's not the best to stick to this 100% but using it, until you work out when it's not appropriate, will help your game.

L

thank u :3

I once played this game against Martin:

I'll analyze the game to find the principles I can that you can use to not only beat Martin yourself, but also others and raise your rating. e4 gains control of the center using a pawn, and opens your queen and bishop to attack in the future. Don't bring out your queen early, though; it is too valuable, and the opponent will kick it around while gaining a development advantage. This is why Qh5 is a bad opening move. Also, there is the chance that you may not see your opponent's attack and hang it. e5 does the same for black as e4 does for white, and is a common response to e4. Nf3 attacks the pawn on e5 while also solidifying your control over the center of the board. Nc6 defends the threat while also solidifying their center control. Bc4 attacks the weak f7 pawn and adds more center control while opening the path for the king to castle. Nf6 develops a knight, solidifying the center more for black and attacking the e4 pawn. However, this falls prey to the tactic shown in the game. Ng5 does not add defense to the e4 pawn, since d5, guarded by the queen, would fork the knight and bishop after recapturing the knight. This move is possible after Nf6 since it blocks the queen's view of the g5 square; otherwise you would have to play d3 to add defense from the bishop on c1 first. This strengthens the attack on the f7 pawn, and after the knight captures, it will fork the queen and rook. This requires the response of d5 to block the bishop's view of f7. exd5 captures the pawn on d5, and if it is not recaptured, black will simply be down a pawn after Nc3. Therefore, Nxd5 is played. This allows a brilliant move, Nxf7, sacrificing the knight for a strong position. Since the knight is forking the queen and rook, black must play Kxf7 to save their pieces. This is only effective due to the follow-up move Qf3+, forking the king and knight already under attack by the bishop, threatening to win the knight back. The knight cannot block the queen's check, since the bishop is pinning it to the king. Kg8 is one of the worst moves you can play in this position; you should play Kd6 instead to add another defender and hang onto the knight. Going anywhere else will allow Bxd5, simply winning back the knight, since it is now defended by the queen on f3, and cannot be recaptured without hanging the queen. Of course, your king will be in the center of the board, where it can eventually be made vulnerable and attacked. This is why there is still an advantage, despite being down a knight. The next move would be Nc3 to strengthen the attack on the knight further. Going back to the game, Kg8 traps the king along the a2-g1 diagonal, where you now have forced mate. After Bxd5+, black plays all they can to delay mate by hanging the queen via Qxd5. After Qxd5+, the only legal move is Be6. This could be played on the previous move, but it results in Bxe6#. With this move being played now instead, the response is the same move, except with the queen: Qxe6#.

Many of these tactics apply in many more situations, so scan for them whenever you can during your games!