why did I fail this puzzle

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Shututu
I'm only 1000 in rapid so I do a lot of puzzles to try improve but I came across this puzzle I just don't understand how I got it wrong. It's an endgame scenario. Black to move. The board is set up. white pawns on: a4 b5 and h4 white king : b4 white rook: c4 black pawns : h5 b6 and a7 black king : d5 black rook: g3 The puzzle wanted me to play: 43: .... , Rg4(black) 44: Rxg4 , hxg4 45: Kc3 , g3 46: Kd3 , g2 What I played: 43: a5+ to what I assume is checkmate. Am I incorrect in saying that's checkmate if so how am I wrong? If indeed that is checkmate why does the puzzle value a pawn push for promotion over checkmate?
nklristic

You forgot about en passant.

justbefair
Shututu wrote:
I'm only 1000 in rapid so I do a lot of puzzles to try improve but I came across this puzzle I just don't understand how I got it wrong. It's an endgame scenario. Black to move. The board is set up. white pawns on: a4 b5 and h4 white king : b4 white rook: c4 black pawns : h5 b6 and a7 black king : d5 black rook: g3 The puzzle wanted me to play: 43: .... , Rg4(black) 44: Rxg4 , hxg4 45: Kc3 , g3 46: Kd3 , g2 What I played: 43: a5+ to what I assume is checkmate. Am I incorrect in saying that's checkmate if so how am I wrong? If indeed that is checkmate why does the puzzle value a pawn push for promotion over checkmate?

 

Playing a5+ is a nice idea.  However, you evidently haven't learned about en passant captures.

Shututu

Oh I get it now . That was dumb of me .

Shututu

Thank you for the help!

eric0022
nklristic wrote:
 

You forgot about en passant.

 

I faced a very similar situation many years ago (a similar pawn push, which is "checkmate") in what would be one of two occurrences of me finding out about en passant, where the other occurrence is in a real-life tournament where I panicked upon seeing an en passant capture early in the opening.

nklristic
eric0022 wrote:
nklristic wrote:
 

You forgot about en passant.

 

I faced a very similar situation many years ago (a similar pawn push, which is "checkmate") in what would be one of two occurrences of me finding out about en passant, where the other occurrence is in a real-life tournament where I panicked upon seeing an en passant capture early in the opening.

I can understand that feeling. Even when you know about the rule, but you are lower rated it is possible to completely miss that move. happy.png