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1. Nxd6 1-0
…with the continuation 1. … Nxd5 2. Rxc3 bxc3 3. Bxc3+ Re5 4. Bxe5+ Rf6 5. Bxf6#
If black responds 2. … h5 then 3. Rcg3+ Kh7 4. Rg7 Kh6 5. R2g6#
1. N:d6
if
1 … N:d6
2 R:c3 and if
2 … bc
3 B:c3+ and mate soon follows
so
1 … Re5
2 Nb5
and black has lost an important pawn and is still in trouble.
Note that if:
1. N:c3 bc
2. R:c3 Nf6
and black has still lost a pawn, but isn’t in as much trouble.
1. Nxd6 Nxd6
2. Rxc3 bxc3
3. Bxc3+ Re5
4. Bxe5+ Rf6
5. Bxf6#
This comment has been removed by the author.
Clearly, White would like to open up the long diagonal for his Bishop. The Bishop on b2 and the Rook on the open g-file would then be a killer combo. That suggests 1. Nxd6, and among other points, the protection of an interposing black Rook on e5 has been eliminated:
1. Nxd6 Nxd6 2. Rxc3 bxc3 3. Bxc3+
And if Black plays 2. .. Rf6 then 3. Re3 is poisonous.
1. Nd6: Nd6:
2. Rc3: and Black has no next move.
Nxc3 or Rxc3 look tempting. But the correct continuation is:
1. Nxd6!! Re7/Re5 (forced)
2. Nxe4! Rxe4 (forced)
3. Rxc3!! bxc3 (forced again)
4. Bxc3+ Rd4
5. Bxd4+ cxd4
6. Rf2 1-0 (Easy endgame for white)
1.Nxd6
1…Nxd6 2.Rxc3 Re4 3.Rd3+ Rd4 4.Rxd4 h6 5.Rg4+ Kh7 6.Rg7+ Kh8 7.Rg8+ Kh7 8.R1g7#
1…Re7 2.Nxe4 Rxe4 3.Rxc3 Rd4 4.Rd3 h6 5.Rxd4 cxd4 6.Bxd4+ Kh7 7.Rg7+ Kh8 8.Rf7+ Kg8 9.Rxf8+
4.Rd3 f3 5.Rxd4 fxg2 6.Rg4+ Rf6 7.Bxf6#
1. Nxd6! Nxd6 (alternative below)
2. Rxc3! h5
(2. … bxc3 4. Bxc3+ Re5 5. Bxe5 Rf6 6. Bxf6#)
3. Rg3+! Kh7
4. Rg7+ Kh8 (4. … Kh6 5. R2g6#)
5. Rf7+ Re5
6. Bxe5#
1. … Re5
2. Nxe4 Rxe4
3. Rxc3 h5
4. Rg3+ etc. looks like mate in 7.
1.Nxd6 Nxd6 2.Rxc3 Re4 3.Rd3+ Rd4 4.Rxd4 h6 5.Rxf4+ Kh7 6.Rg7+ Kh8 7.Rxf8#