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Re7+ Kxe7, Nxc6+
1. Nxc6! Wins easily. Threatens Queen as well as mate. Black can prevent only one.
A- 1……Qxf3. 2. Re7+. Kf8/g8. 3. Rd8#
B- 1. ….Qxc6. 2. Qxc6. A Q up for a piece with more material gains to follow.
C- 1……Qxd1+. 2. Rxd1. A Queen up for R and more gains to follow.
D- 1……Qc5 covering e7. 2. Re7+. Qxe7 forced to prevent mate. 3. Nxe7. Kxe7. 4. Qxa8. Again winning the Q for a piece or R.
Harry
1. Nxc6 fails to Qxf5 allowing Kg6 later.
Rd7+ Kd7
Nxc6+ wins the Queen
1. Nxc6 fails to
1. ……… Qxf5 allowing Kg6.
Re7+ Ke7
Nc6+ wins the Queen (corrects my previous comment)
1. Nc6 is winning, too, since 1. …Qxf5 won’t save black. I am not sure 1.Re7 is a better move, though it wins, too quite clearly at least a queen for rook and knight, and likely just for the knight since the black king should end up back on the 8th rank separating the black rooks once more.
In any case, here is 1.Nc6 Qxf5:
1. Nc6!? Qf5
2. Re7 Kg6
3. Ne5
And black must lose decisive material or get mated:
3. ………….Kh6
If black tries 3. …fe5, 4.Rd6+ leads to mate, and 3. …Qe5 will ultimately lead to the loss of the queen for a knight since black can’t take retake the rook at e5 without again getting mated starting with 5.Rd6+. Continuing:
4. Nf7 and black must lose a rook at minimum since 5.Nxh8 occurs with check after 5. ….Kg7 or 5. …Kg6, and 5. ….Kh7 allows 6.Qxh5+ followed soon by mate.
And,
How about Qa3 or Qg3 ?