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If Kxa2,it's mate in two with white R to a file, I think it's Ra6,or Ra5,I do not have puzzle in front of me,but it's still a mate in two as long as R goes to a file#

This is from a game of mine and recreated from memory, so it might need editing to make it better. 

i did this too someone it is an easy one

mate in 3

oh never mind there are 2 solutions you could sac the rook and double check for mate

White to play and mate in 4:

The position comes from a game that I actually played; however, I didn't think of and analyze the winning combination until after the fact (in the real game I moved my rook away from f1).

White to mate in 6 moves, or else Black loses his queen.  I'd say that move order is very important here.  I'd appreciate if any of you could check whether the mate shown in the puzzle is forced, and whether there's a faster way (assuming black doesn't interpose and sacrifice his queen after your second move).

From a game of today ^^

Mate in 3

Lasker Trap:

um, white is in check

True, and two white bishop IS possible (after a dumb pawn trade). However there is no logic in the steps. For the first move almost all king moves are good. The Bishop move is completely illogical (it's giving itself for free). The Queen check is only a check but Qb8+ achieves a better position. Black has the possibility to go between the Bishops. But no black put's the bishop back where he started (and only THEN does he seal his fate). Conclusion: this isn't a real puzzle (where there is only 1 path and where opponent plays smart).

For one with an 1844 rating, you should've noticed that within 2 seconds.

This endgame can be easily won.

Opening game encounter: After mirrorring previous moves (1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4)  I decided to offer a white knight for the loss of the black kings castling freedom (4.Nxf7 Kxf7). Just a handy tool for 1min games? or did I not really just loose two points?

What if black takes with knight or pawn?