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Though this is not a high quality game (mistakes were made on both sides), I think it is a nice example of how to use the tactic known as
the double check.
I should mention that I haven't consulted Fritz or similar for this annotation - so the comments are only made by me. |
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1. e4 d5
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This opening is called the center counter defense or the scandinavian defense. The idea for black is to avoid White getting a strong center. The drawback for black is how to answear, when/if White simple takes the pawn. If black for instance tries to recapture with the queen, he will a lose a tempo, if white replies with Nc6. |
 
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2. exd5
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The most common answear for white. |
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2... Nf6
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So, Black avoids the problem with the exposed queen. However he is now down a pawn. At least for the time being. |
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3. d4
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White choses to develop instead of trying to keep the pawn. |
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3... Nxd5 4. c4
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Black is now equal again, however he loses a tempo now. |
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4... Nb6 5. Nf3
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Following the general principle(GP): Knights out before Bishops. |
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5... g6 6. Nc3 Bg7
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Black tries with a fianchetto. |
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7. Be3 Bg4
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Always nice, when you can develop with a pin. |
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8. Be2
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The GP: unpin ASAP!
As filippus kindly pointed out for me, after 8...Bxf6, 9. Bxf6, Black cant take the unprotected c-pawn with the Knight as White can play Qa4 or Bxb7 winning material...
Howevever, as we shall see, White overlooked this fact. |
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8... c6
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I think castling or Nc6 would have been stronger and more natural. Black must keep up in "the develop-race".
But the pupose of this move is clear: W. can no longer respond with Qa4 or Bxb7(as the c6-pawn is blocking), after 8....Bxf6, 9. Bxf6. So W is now forced to recapture with the g-pawn if he wants to keep his c-pawn... |
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9. O-O
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...Thats why castling on the Q-side should have been considered! |
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9... Bxf3
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Black takes advantage of whites blunder. White now has to choose between a exposed king or a pawn down. |
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10. gxf3
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Whites king is now exposed, but he has the bishop pair and dominance in the center. |
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10... O-O 11. Qd2 Re8 12. Rfe1 Nb8d7 13. f4
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The plan is to strengthen the center and eventually trade of the double pawn. |
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13... Nf6 14. Kh1
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Making room for the rook to fullfill a GP: Control open or half open files. |
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14... e6
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The idea is perhaps to dispute Whites center control |
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15. Reg1 Nbd7 16. Rg2
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Planning to double Rooks |
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16... Qc7 17. b4
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It looks like Black is preparing an attack at Whites center, however Whites response b4 is probably weak. |
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17... a5
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Capturing here would allow Blacks a-rook to enter the game. |
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18. b5 cxb5 19. Nxb5
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Nice outpost for the Knight - cant be attacked by pawns |
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