Puzzles needed for tactics trainer

Check, double check, double check and mate

Previous computer move: c6

This is from a game of mine.  White didn't play d4 in the French Advance variation, and ended up paying to consequences.

This is also from a game.  I'm betting that since both knights can block, this will be considered unusable.  The first alternate could also be a computer move, meaning that Re1 still wins material.  I guess it'd have to stop there since capturing with the queen or letting the queen get captured still wins the queen for a rook.

Here is a third one from a game.  I think my opponent missed this wonderful opportunity.  I kicked myself for this, but luckily my opponent didn't see it.

This is from the same game, but a couple of turns later.  My opponent resigned because they thought they couldn't win the bishop back.  I told them they were crazy.

Thanks a bunch!

A nice rook sac here.

Yes, but in that case, the tactic should be (with my knight on d4 moved a square or two away to give way to the bishop),

Re1+ Ng1 Rxe1#

Either way it is a mate in two. I think that it is a good problem.

Rxe1#?  What piece is that rook taking?  Is it taking itself?  If you mean Rxg1#, then that's dead wrong.  Rxg1+ is perfectly fine!

I think Metaknight's line is wrong, though.  It's mate in 4!

Heck, I couldn't find the game I wanted to post!! 

(Dolmatov-Beliavsky)

(... Rxg7 Kxg7 Rg1+ Kh7 e6 (or f6, I don't remember) Nd5 Rg7+ Kxg7 Nf5+ ... and so on)

Nice Mate in 4 here:

Mate in 6

I think that this puzzle is ambiguous because of the possible rook-rook form on black using the night. One of the rooks should be moved.

Fritz says forking the rooks is -2.71

Why?  Rxg1+ still works.  Why settle for a mate in 2 when you have a nice mate in 4?

Another nice puzzle:

I'm betting they say no because blocking with the bishop is still mate in 2.

Oh, nevermind.  They can't.

28... Be2 is horrible!  It'll make a nice computer move.  It looks like the best choice is this, but it still looks like black is dead.  I hope I didn't miss anything.

Oh, and on your mate in 4, doesn't another white move save them?

I'm not arguing with these nice puzzles, just the other person's moves!

Ambiguous- 22... Qxh4+ Kxh4 23...Rh2#

Link to game: http://www.chess.com/livechess/game?id=350376347# 

http://www.chess.com/echess/game?id=57608028