I note that all these blunders appear to have taken place fairly late in the game, and in fairly aggressive or winning positions. That means that the cause likely lies in either time pressure or in overpressing. There are several ways to improve the time pressure problem, ranging from blitz practice to adjusting your pacing throughout long games. What's harder is playing patiently in a position where you appear to be able to push for a win. When you're presented with a position like this, the key is to ask yourself what your plan to win will be, and follow that. If a tactic presents itself, then great! But it is far better to have a plan than to push too hard trying to make a "killing blow" happen instantly. Sometimes all you get from a ferocious attack is a superior endgame. Follow the plan and let the tactics come naturally, and you're far less likely to mess up a won position by pushing too hard. Blunting this blind aggression and forcing yourself to think also helps you to move more slowly, and cuts down on blunders made in haste.
Chess blunders
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Blunder number two
In the last game I just thought the correct move "cxb5" and then a5 after which I win the opposition, it "too long". I wanted to win "elegantly" anf quickly.
I don't know what is going on. It remind my andy murray in the finals on grand slam, when he kept missing the big points and lost to Federeder and co.
Would be very thankful for any analysis, tips or hints.