In 6th game it is showing Bc4+ But It is actually a mate
Lesson No.3:6 Quick Mate Tricks

It's not mate as White has to deal with 3 interpolations
Black resigned in this move

Well, these chess tricks are quite simple.
Still, great tricks!
Keep studying tactics. They are very helpful.
https://www.chess.com/blog/leonquinplayz/crushing-a-2100-in-15-moves-classic-greek-gift-sacrifice (crushed @sexualvectors in 15 moves).
https://www.chess.com/blog/leonquinplayz/warning-this-is-what-happens-when-you-play-carelessly
(crushed @morgotibneru in 13 moves).
Really realistic traps.
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