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1. Nd5 aiming for Ne7+.
No suitable reply for black though since the knight could not be captured. 🙂
I suppose 1 Cd5, so as to distract Cf6 from defending h7, and at the same time threating Ce7+, with double check to King and Queen.
Nd5 looks winning
1.Nd5! threatening both 2.Ne7+ winning the queen or 2.Nxf6+ Black takes either knight 3.Qh7 mate.
A)1….Kh8 2.Nxf6! g6 3.Nge4 +- and White is a piece up his advantage is therefore decisive .
B)1…Re8 2.Nxf6+ Qxf6 3.Qh7+ Kf8 4.Qh8+ Ke7 5.Re1 Qe6 6.Rxe6+! et caetera
1.Nd5! (if1… Re8 then 2.Nxf6+ and it doesn’t matter by which the black take the knight because it’s mate after both 2… Qxf6 or2… gxf6 3.Qh7#
and if 1… hxg5 then 2.Ne7+ bagging the queen.
Nd5, and black can’t cope with the threats of mate on h7 and forking the queen with Ne7.
1.Nd5 threatening Nxf6+ and Ne7+ (forking King and Queen), black must play Qxd5 2.Rxd5 or black plays 1…Nxd5, 2.Qh7 mate
From aeh690
Black’s Nf6 is covering the h7 square preventing Qh7#. Alas, White’s Ng5 is under attack. White’s two pawns down so retreating is not an attractive proposition.
1. Nd5! with two threats: 2. Nd7+ forking the black King and Queen, and 2. Nxf6 followed by 3. Qh7#.
Black can get two pieces for his Queen by 1. … Qxd5 2. Rxd5 hxg5, winding up with two pieces and two pawns for a queen.
1. Nd5 !
(with double threat:
2. Nxf6 and 3. Qh7 mate; or
2. Ne7 + and 3. Nxc6).
Erik Fokke
Amsterdam, Netherlands
1. Rd6 Qd6
2. Ne4 Q anywhere
3. Nxf6+ anything
4. Qh7#
Trouble is, what if black play cxd6 on the 1st move?
1.Nd5 looks strong (threating Nxf6 .. Qh7++ mate or Ne7+ forking black’s king and a queen)
1. Nd5, with the threat of Ne7+ winning the queen as well as Qh7++ if 1… Nxd5.
So 1… Re8,
2. Nxf6+ wins easily.
Has to be Nd5. The only other move that jumps out at me is Nf7, but that seems to lead no where good for white as his other knight and the rook at f1 are too many moves out of play to participate in any attack. The point of Nd5 is that it threatens Ne7+ forking the queen and king, and also threatens Nf6+ allowing white to play Qh7#. If there is a defense that doesn’t give up black’s queen, I am not seeing it. Best seems to be to just trade the queen for the two knights:
1. Nd5 Qd5 (alternatives below)
2. Rd5 hg5 (Nd5? 3.Qh7#)
3. Rg5 and white is up a queen for two knights and a pawn overall.
Or
1. …..hg5
2. Ne7 Kh8
3. Nc6 Nc6
4. hg5 Nh7 (best I find)
5. Qe4
with the twin threats of Qc6 and the combo of Kg2 and Rh1:
5. …..Na5 (Nb8 or d8 6.Qa8)
6. Kg2 Rae8 (Rfe8 same; Ng5 7.Rh1)
7. Qh4
And I don’t see how black prevents a mate here other than by throwing more material away and will only buy a move or three.
Or
1. …..Kh8
2. Nf6
And to prevent the mate with Qh7, black must play
2. …..g6
3. Nge4 and white is up a piece with threats like Qc3 coming to continue a strong attack.
Nd5!
1. Nd5 Qd5
2. Rd5 wins a queen for a knight
1 Nd5
This combines two threats: check at e7 which would win the Queen, and attacking the Knight at f6, which is protecting against Qh7#
1…. Kh8
The direct 1… Qxd5 is actually Black’s best move here, but it leaves him down a Queen for two Knights and a pawn after 2 Rxd5 hxg5, 4 Rxg5 with material superiority and a better position.
Moves such as 1… hxg5 and 1… g6 also leave Black down a Queen vs two minor and a pawn after 2 Ne7+
Nor does 1… Re8 do any good, due to 2 Nxf6+ Qxf6 (gxf6 is mate in two, and Ke1, 3 Ngh7+ Ke7, 4 Efe1+ wins the Queen and mates shortly after), 3 Qh7+ Kf8, 4 Qh8+ Ke7, 5 Rfe1+ winning the Queen and mating soon.
With the given move, Black stops the Knight fork.
2 Nxf6 g6
All other roads lead to worse.
3 Ng34
White is up a piece with a strong attack, the immediate threats being Qd2 or Qc3.
3…. Qe6
Black tries to get his Queen into play.
4 Qd2! g5
Necessary to stop Qxh6+
5 hxg5 Qf6
6 g4! Qg6
7 f4 Nc6
Black can slow things down for a moment with 7 … c3, but the result will be the same.
8 f5! Rfe8
Desperation, but after 8… Qg7, 9 gxh6, the Queen is out of places to hide.
9 fxg6 Qxd2
10 gxh6! fxg6
Else 11 g7#
11 Rxd2
White is now up a Rook and Knight and should mate soon.
1.Nd5 looks winning, because it threatens both 2.Ne7+ and 2.Nxf6+. Phil
Nd5
I think Nd5 wins…
nd5
han
Nd5
1. Nd5
A 1…N:d5 2. Qh7#
B 1…hg 2. Ne7+ and 3. N:c6
C 1…Q moves 2. N:f6+ and 3. Qg7#
Nd5! threatens both Nxf6+ (followed by Qh7#) and Ne7+.
I think Nd5 is the best move…
Nd5 – and the Black queen has to capture the Knight or will lose the f6 Knight leading to mate in two.
This chess problem is a good example that it is very simplistic to limit yourself to assume a win after 1. Nd5!
When you try to win after 1. Nd5 against an unforgiven opponent (a chess engine), you discover very soon that 1. Nd5 does not guarantee any win at all UNLESS you play a very specific set of moves!
Here is the set of moves that I found wins. Yes, it starts by 1. Nd5 but to arrive to a win is a very convoluted matter that I would never ever have found myself at the first try and if I did not have such a tenacious opponent in the chess engine Rybka.
Here it is (FEN: rn3rk1/2p2pp1/p1q2n1p/1p4N1/2p4P/P1N3P1/1PQ2P2/3R1RK1 w – – 0 1):
(13) Michael – Deep Rybka 4 SSE42 x64
Blitz 25m, 01.12.2010
[Deep Rybka 4 SSE42 x64 (30s)]
1.Nc3-d5 Qc6xd5 2.Rd1xd5 h6xg5 3.Rd5xg5 Nb8-d7 4.Qc2-c3 g7-g6 5.f2-f3 c7-c6 6.Rf1–d1 Nf6-d5 7.Qc3-d4 Nd7-f6 8.Rd1–e1 Nf6-h7 9.Rg5-e5 Nh7-f6 10.g3-g4 Ra8-d8 11.Qd4-a7 Nd5-f4 12.Re5-e7 Rd8-d2 13.Qa7xa6 Nf6-d5 14.Qa6xc6 Nd5xe7 15.Re1xe7 Rd2xb2 16.Re7-e8 Rb2-b1+ 17.Kg1–f2 Rb1–b2+ 18.Kf2-g3 Nf4-e2+ 19.Kg3-h3 Kg8-h7 20.Re8xf8 Kh7-g7 21.Rf8-e8 Ne2-f4+ 22.Kh3-g3 Nf4-e2+ 23.Re8xe2 Rb2xe2 24.Qc6xb5 Re2-a2 25.Qb5-b4 Ra2-e2 26.a3-a4 Re2-e8 27.Qb4xc4 Re8-d8 28.g4-g5 Rd8-d7 29.Qc4-c6 Rd7-a7 30.Qc6-b5 Ra7-a8 31.a4-a5 Ra8-f8 32.a5-a6 Rf8-d8 33.Qb5-b7 Rd8-f8 34.a6-a7 Kg7-g8 35.a7-a8Q Kg8-g7 36.Qb7-b2+ Kg7-g8 37.Qa8xf8+ Kg8xf8 38.Qb2-e5 Kf8-g8 39.Qe5-f6 Kg8-f8 40.h4-h5 Kf8-e8 41.h5xg6 f7xg6 42.Qf6xg6+ Ke8-d7 43.Qg6-f6 Kd7-c8 44.g5-g6 Kc8-b8 45.Qf6-e7 Kb8-a8 46.g6-g7 Ka8-b8 47.g7-g8Q# 0–1