This trend towards hyperactive moderation is getting ridiculous. Do you, SF, intend to upbraid people anytime you disagree with the tone or tenor of one of their remarks?! Please treat people like adults. This sort of heavy-handed moderation is a much greater threat to the integrity of the forum than the occasional pointed exchange.

By the way, I had a look at it for half an hour. Now I think 1.Nxf7 and 2.Nd8! wins too. And it is pretty easy. In every case of the 11 possibilities you proposed nearly the same manoeuvre wins for White! He will pick up the e6 pawn with his rook while avoiding pins, then he will put his knight on c6, maybe first his rook on f6 with ckeck, and then play one of the three possibilities a)put the rook on d6 and push the e-pawn or b) collect the black a-pawns or c) both a and b! Black has dozens of queen moves in every single move, but he can do absolutely nothing! And thats the reason why computers don't see it maybe. Too many black queen moves are possible to calculate them all, but the winning manoevre works in every case I think. (Meantime I ckecked your ...Qxg2 Fritz position with my computer and he says about +4 after 5 minutes and this is increasing with the time - seems far from equal!). Ask your IMs or GMs what they do against my winning manoevre. 

[quote author=Amann link=1226434702/120#134 date=1250897612]Hello,

you can belive me that i considered the possibility of 1.Nxf7!
This move was the reason why i added black an additional pawn on a6 ( i don`t like to add some pieces in a studies witout a reason) instead of a white pawn on a6 and black pawn on a7  to secure black enough chances of counterplay in this line. I think it´s enough, Fritz 11 thinks it´s enough and some strong players ( IM and GM) which i showed the 
study are also of the same opinion.

Ok, you say 1.Nxf7 is also a forced analytical win which would refute the whole study of course.
Please can you prove your opinion in the following lines:
1.Nxf7         Kf8

1.Nxf7         Qh4
2.Nd8          a)Qg5
                 b)Qg4
                 c)Qg3
                 d)Qb4
                 e)Qa4
                 f)Qe4
                 g)Qe1
                 h)Qh7
                 i)Qh5
                 j)Qc4

If you can show an analytical forced win  in these lines with clear variations and a clear winning positon for white (not white is better and  has good winning chances) the study is refuted.

congratulation

Fritz suggests 
5.Rf6 Kg7
6.Nc6 Qxg2 as equal.

But these Variations are by no means forced. Black has several other Queenmoves instead of 2... Qc4 or 3...Qd5 and maybe 1...Kf8 is also good enough. Generally i think that Balck has enough counterplay if he manages to bring out his queen but you are right that white can try to play for a win given it would be a tournamentgame. But i am sure that you can not prove a forced win for white in this variation. The stipulation of the study is white to move and win (forced variation with a clear result at the end)and not white to move and get some winning chances!

1.Rf5           Kh4!
2.Kd2          Rxd3!
3.Kxd3        Bg6
4.Ke4          Kg4 and black wins

Hello,

1.Nxf7           Qh4! ( maybe Kf8 is also good enough, but i think it´s
                              better to bring the queen in to the game at  
                              once)
2.Nd8!           Qc4! (according to Fritz 11 other moves are also 
                           possible to maintain the balance)
3.Rc6            Qd5
4.Rxe6           Kf8
5.Rxa6           Qxe5
6.Rxa7           Qc5 draw

Ok your beginning was naturual and correct:

1.Bc2                                                  cxd3
2.Bxd3                                                 Rd7! 
3.Bf6! (winning the last black pawn)        Kxf6
4.Rxf4                                                  Kg5

The problem now for white is not his material disadvantage but the bad placement of his pieces. How can he save the game?