Solution
1. Nd8 Rd7 (or Rc7) 2. Nxb7 Rxb7 Rxd5
1. Nd8 “forks” the f7-rook and b7-bishop. This can be seen as a fork since the f7-rook has a higher value than the knight, whilst the b7-bishop is supposed to defend the d5-knight.
Exercise #124
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1. Nd8 Rd7 (or Rc7) 2. Nxb7 Rxb7 Rxd5
1. Nd8 “forks” the f7-rook and b7-bishop. This can be seen as a fork since the f7-rook has a higher value than the knight, whilst the b7-bishop is supposed to defend the d5-knight.