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Rg4 g4
Ng4

Please, whole move order:

  1. a7 Qc8
  2. e5 g5
  3. Rg1 g4+
  4. Nxg4 Bg6
  1. a7 Qc8
  2. e5 g5
  3. Rg1 g4+
  4. Nxg4 Bg6
  5. Nh6+ Kh7
  6. Nxf7 Rxf7
  7. Rxg6+ Kh7
  8. Rh6+ Kg8
  9. Qh8+ mate
  1. a7 Qc8
  2. e5 g5
  3. Rg1 g4+
  4. Nxg4 Bg6
  5. Nh6+ Kh7
  6. Nxf7 Bf5+
  7. Kh2 Rxf7 and black wins.
  1. a7 Qc8
  2. e5 g5
  3. Rg1 g4+
  4. Rg4 g4
  5. Ng4

Black king can't move and is one move away from mate Nh6+

g5 is dumb and didn't even consider it....

  1. a7 Qc8
  2. e5 g5
  3. Rg1 g4+
  4. Rxg4 hxg4+
  5. Nxg4 Bf5

Now the knight is pinned and cannot move.

It's late, I'm tired. I'll figure it out tommorrow.

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