quinta-feira, 20 de fevereiro de 2014

Xadrez - Mate em 2! (Fernando Teixeira)

 Problema composto por Fernando Teixeira (problem composed by Fernando Teixeira).Código FEN: k7/P2N1Np1/B2p1pP1/1P1PpK2/4P3/Q1P2PRP/6p1/6B1 w - e6 0 2.

As Brancas jogam e dão xeque-mate em 2 lances!

(White to play and give checkmate in 2 moves!)

PCFilho

5 comentários:

1. 1- Bh2 Kxa7 2- Bc8#

2. Rodrigo,

1. Bh2 g1=Q,

And checkmate is not possible...

3. 1 dxe6 ep!! d5 2 Qf8#

4. I think that this is the first puzzle you've posted here where the key move is a capture en passant.

5. Well done, Jake! The solution is:
1. dxe6 e.p.!! d5
2. Qf8#

The full explanation, in the composer's words:

Time to give the solution for the last puzzle: dxe6 e.p.
Taking the pawn en passant gives black a move, avoiding stalemate, and when black plays the forced d5 move, it opens the path for white's Queen to mate - Qf8#
What most of you probably don't know is a chess problem's composition rule: The solution can be pawn x pawn en passant ONLY if it can be proven that the last move was made by this pawn, from the second to the fourth rank!
Notice that it can be proven at the diagram:
- There is only one white piece missing, and it must've been taken by the g2-pawn - the only doubled one. More, it was taken before the last move, since the f3 and h3 squares are taken.
- The last move wasn't made by the pawns at g2, f6 or d6, since the squares behind them are taken. The pawn at g7 has never moved.
- The last move wasn't made by their King - there are no squares from it could've come from! If it was at b8, it was under attack from both the a7-pawn and the d7-knight - impossible. If it was at b7, it was under attack from the bishop, but this bishop had no way to get there to give this check -impossible!
- Finally, the e5-pawn - his was the last move, by exclusion of all other black pieces. And this move must've been e7-e5, since it could not be at e6 before - or it would've been attacking our King.
So, proven that the last move was e7-e5, it is allowed to solve the problem by dxe6 e.p.

Regras para postar comentários:

I. Os comentários devem se ater ao assunto do post, preferencialmente. Pense duas vezes antes de publicar um comentário fora do contexto.

II. Os comentários devem ser relevantes, isto é, devem acrescentar informação útil ao post ou ao debate em questão.

III. Os comentários devem ser sempre respeitosos. É terminantemente proibido debochar, ofender, insultar e/ou caluniar quaisquer pessoas e instituições.

IV. Os nomes dos clubes devem ser escritos sempre da maneira correta. Não serão tolerados apelidos pejorativos para as instituições, sejam quais forem.

V. Não é permitido pedir ou publicar números de telefone/Whatsapp, e-mails, redes sociais, etc.

VI. Respeitem a nossa bela Língua Portuguesa, e evitem escrever em CAIXA ALTA.

Os comentários que não respeitem as regras acima poderão ser excluídos ou não, a critério dos moderadores do blog.