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1.Rg3+ Kf8 2.Rh3 Wins immediately.
1. Rg3 Kf1
2. Nd7 Ke8
3. Rd8
— kiokups
I think white should win this.
1: Nd7, Qh1+
2: Kc2, f4
3: Rxe7+, Kg6
4: Bd3+, Kg5
5: Rg7+ and white wins…
The key move is 1:Nd7 and keep bishop on a2-g8 diagonal, and be careful not to block the possibility to switch to the b1-h7 diagonal.
The best move I have found for black is 1: -, Qh4
But white can still win.
Thanks Susan! Nice problem.
I guess I have figured it out:
1. Rg3+ Kf8
(if 1. … Kf6 2. Nd7++)
2. Rh3!! Qxh3
(if the Queen moves along the diagonal the Knight forks it with check)
3. Ne6+ Ke8
(any other, then 4. Ng5+)
4. Bb5+ Kf7
5. Ng5+ and Nxh3 +-
rg3+… watch out for nd7
h
1. Rg3+
If 1. Kh7 or Kh6, then 2. Rh3+ and 3. Rxh8.
If 1. Kf6, then 2. Nd7#.
If 1. Kf8, then
2. Rh3 Qxh3
3. Ne6+ Ke8
4. Bb5+ Kf7
5. Ng5+ and 6. Nxh3
1.Rg3 Kf8
2.Rh3!…
Wow, beutiful! Have to admit I used my engine to solve it, so I am not posting it… Do all GM’s see this at the table?
1. Rg3+ Kf6 2. Nd7#
1… Kf8
2. Rh3 Qxh3
3. Ne6+ Ke8
4. Bb5 Kf7
5. Ng5+
1 0
The only winning line.
Yes! even though I am not an FM, I saw this line.
I am amused at the first post. While that line does force the win of the Q, quite beautifully, winning with B+N vs. two pawns can’t possibly be “immediate.” In fact, I doubt more than a few hundred people in the world could do it at all.
In real life, I’d probably just play 1. Rg3+ Kf8 2. Rg8+ Q:g8 3. Nd7+ Ke8 4. B:g8 and offer a draw.
Just for fun, I set this up in my computer. It took 43 moves for white to mate. Very instructive to watch the machine mate with B+N vs. lone king.
I myself was amused at CraigB´s post –
according to fide.com
“December 2008 saw a record number of GMs (1,192) and IMs (2,916) …”
apud http://en.wikipedia.org/wiki/Grandmaster_(chess)
That means there are more than four thousand players to whom that ending (B+N vs 2 pawns – too far from their promotion squares to be considered a serious threat, by the way) would be a routine win.
I would estimate that if you add the number of players above 2000 (FIDE rating) plus the good amateurs that play at the ICC, yahoo and other sites, plus regular club players that don´t play on-line but are well-acquainted with chess, there are more than a hundred thousand players around the world who would win such an ending…