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I am playing with whites. Currently my queen is at c7 and it's my turn. If I move my queen to d8 and declare check on the king, is this also a check-mate?

sorry for the seemingly noobish question, but I am not sure and all resources that I looked up did not provide me with a definitive answer.

[Title "White to move"]
[fen "r1b1kb1r/ppQp1ppp/2n2n2/8/1q6/4P3/P1PP1PPP/RNB1KBNR w KQkq - 0 1"]
8

No, it is not checkmate, because your opponent can capture your queen with either the knight on c6 or the king on e8.

Checkmate occurs when you give a check to your opponent and your opponent cannot either move the king out of check or capture the piece that is giving the check or block the check my interposing another piece between the checking piece and the king.

So, in this case -

[FEN "r1b1kb1r/ppQp1ppp/2n2n2/8/1q6/4P3/P1PP1PPP/RNB1KBNR w KQkq - 0 1"]

1.Qd8+ Kxd8 (1...Nxd8)

There is no checkmate.

Consider this hypothetical position. In this case, it would be a checkmate -

[FEN "r1b1kb1r/1pQp1ppp/pB3n2n2/8/1q6/4P3/P1PP1PPP/RN2KBNR w KQkq - 0 1"]

1. Qd8#

Here, the enemy king cannot move out of check. The piece that is giving the check (i.e. the queen) cannot be captured by the black king, because it is supported by the bishop on b6. There is also no way to interpose a piece between the queen and the king because they are right next to each other.

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  • 3
    You forgot the third possible way to deal with a check: Place a defender between the king and the checking piece. – Dag Oskar Madsen Jul 21 '14 at 14:46
  • 1
    @DagOskarMadsen thanks! I will edit my post. – Wes Jul 21 '14 at 14:49

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