I believe the idea here is to get rid of d5 and d6 Knights.
D6 protects e8, d5 blocks Queen from getting rid of d6. Just move it away without disturbing the position on the king side, such as Nb4. The next move will be Qxd6 and depending on the black’s choice attack on Re8 or Rxg7, after which the mate is certain. E.g.: 1. Nb4, axb4; 2. Qxd6, Qd7; 3. Qd5, … king must move: Kf8, 4. the roock is ready to go: Rxg7, Qxd5; 5. Rg8+!, Kxg8; 6. Re8+, Rf8; 7. Rxf8X
Nc7
Rg7
1.Nb4 (with idea of Qd6 followed by Re8 and Rg7).
If 1.Nc7 Bc7 and now 2.Qd6 Bd6 followed by Bf8 if white plays 3.Re8.
Rg7
Thematic but premature. 19.Rxg7+ Rxg7 20.Bxg7 Kxg7 and White’s attack is out of gas.
1.Nb4 (With idea of Qd6 followed by Re8 and Rg7). If Qd6 is defended Na6, winning the exchange!
Bxg7 Rxg7
Re7 Rxg3 (if …Bxe7 Nxe7 Queen fork)
Nxf6 Kh8
Rh7 mate
Bxg7 Rxg7
Re7 Rxg3 (if …Bxe7 Nxe7 Queen fork)
Nxf6 Kh8
Rh7 mate
what about ..Kf8?
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Nf4 (to put pressure on Black’s weak point at G7)
Nf4 (to put pressure on Black’s weak point at G7)
19.Nf4 Qd7 might still win for White, but it’s not clear (to me, anyway). Korchmar’s actual choice looks like like a clear win.
I believe the idea here is to get rid of d5 and d6 Knights.
D6 protects e8, d5 blocks Queen from getting rid of d6. Just move it away without disturbing the position on the king side, such as Nb4. The next move will be Qxd6 and depending on the black’s choice attack on Re8 or Rxg7, after which the mate is certain. E.g.: 1. Nb4, axb4; 2. Qxd6, Qd7; 3. Qd5, … king must move: Kf8, 4. the roock is ready to go: Rxg7, Qxd5; 5. Rg8+!, Kxg8; 6. Re8+, Rf8; 7. Rxf8X
After
1. Nb4 .. axb4
2. Qxd6 .. Qd7
White seems to have gained anything, but… themes are still there!
anon 4:10 so it might seem but 3 Qd5!! wins on the spot.
This is a most ammazing tactic!!!!