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Funny!
1.Rxe7 (attraction) Kxe7 (else, white wins with 2.Nb6)
2.Nb6! (Ahem, I said else, but it seems that here, 2.Nb6 is also winning. Why?) Rxa7
3.Nc8+ and the fork snares the rook, leaving White with a whole piece up and the black king is one square too far to capture him.
I wonder if the pawn ending is won for White with black king able to play now 3…Kc6. But I am neither Grigoriev nor Zinar…
Funny!
1.Rxe7 (attraction) Kxe7 (else, white wins with 2.Nb6)
2.Nb6! (Ahem, I said else, but it seems that here, 2.Nb6 is also winning. Why?) Rxa7
3.Nc8+ and the fork snares the rook, leaving White with a whole piece up and the black king is one square too far to capture him.
I wonder if the pawn ending is won for White with black king able to play now 3…Kc6. But I am neither Grigoriev nor Zinar…
1. Rxe7 Kxe7
2. Nb6 Rxa7
3. Nc8+ (gobbling up the rook on a7).
Leaves white a knight up.
Rd7+ 1-0
I looked at:
Nb6? Kxc7 Nxa8 Kb7 with equal position.
Equal is also Rd7+? Kxd7 Nb6+ Kc7 Nxa8 Kb7.
Worse is Rc8+?? Kxc8! Nb6+ Kb7 Nxa8 Kxa8 black wins.
But white is nicely up with a knight after the obvious:
1. Rb7!! Kc8 (enforced)
2. Rxe7
The alternative was to loose rook after:
1. … h5/f5
2. Rb8+ Kc7 (Rxb8 axb8=Q)
3. Rxa8
Surprisingly, white’s knight didn’t play a role in this attack, but black’s did…
Simple enough. Knight fork. And considering the hour I’m working on this: night trick.
1. Rxe7 Kxe7 2. Nb6
If 2. .. Rxa7 3. Nc8+
If 2. .. Rd8 3. a8=Q Rxa8 4. Nxa8 and the king cannot dominate the knight: 4. .. Kd6 5. Nb6 Kc5 6. Nd7+ Kd6 7. Nf6
If 2. .. Kd8 3. Nxa8 Kc8 4. Nb6+ and the king is one move too late to get to b7-square.
1. Rb7
Threatens Rb8+; now black king can’t move to c8, as he will lose his knight on e7.
1. … Nc6
…to guard the b8 square.
2. Ne5 Nxa7
If 2. … Nxe5 then 3. Rb8+ Rxb8 4. axb8Q+ Kd7 5. Qxe5 etc.
3. Rxa7 Rxa7
4. Nc6+ Kc7
5. Nxa7 1-0
This one is simple…once you see it. Rxe7, Kxe7 (what else), Nb6 and if Rxa7 Nc8+ fork, if Rd8 a8Q with the same effect: thr R is lost.
1rook takes knight 2N b6 3 fork
1rook takes knight 2N b6 3 fork
1. Rxe7, Kxe7
2. Nb6, Rxa7
3. Nc8+, Kd6
4. Nxa7, Kc6 (but the knight can escape)
There are three possible tries here-(1) 1.Nb6 which exchanges the rooks and the a-pawn in order to divert the black king to a7 and attack on the kingside with the knight and king, but that attack is far too slow to lead to more than a draw-(2) 1.Rb7 threatening 2Rb8+, and I will cover that line first- and (3) 1.Rxe7 which I will cover last:
1. Rb7 Nc6! (Nc8! 2.Ne5!+-)
2. Rf7 Ra7! (only move now)
3. Ra7 Na7
4. f4 and white has the edge of course, but this is very likely to be drawn.
However, white wins a piece with 1.Rxe7:
1. Re7! Ke7
2. Nb6!
And black must either take at a7 and allow the fork from c8, or he must move the rook and allow a8Q after which he still loses the rook, but on the a8 square instead. In latter case, the black king cannot trap the knight in the corner either:
2. …..Rf8
3. a8Q Ra8
4. Na8 Kd7
5. Nb6 and the knight gets away.
1. Rxe7 Kxe7 2. Nb6 Rxa7 3. Nc8+ wins
This comment has been removed by the author.
Oleg,
You missed a defense for black:
1. Rb7 Nc6
2. Ne5? Kc8! (only move, too)
And now how does white get an edge? The best move I see now is to take at f7 with the rook:
3. Rf7 Ne5
4. Rh7 Nc6
5. Rg7 Ra7
6. Rg6 Kd7
And black will have to defend correctly, but this should be drawn with best play.