White to move. Assess the position. Can you come up with any plan to penetrate Black?

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Qb4 leads to mate.

Ravi

Qb4+ leads to mate in all variations.

Ravi

1. Qb4+ c5 2. dxc5 leads to mate if Black recaptures on c5, but I’m not immediately seeing how to refute other defenses (such as 2. … Nc2)—after all, Black

isup two pieces and can afford to give back a little material to survive.Qb4+ c5

dxc5

1) … bxc5

Rd7+ Kf8

Qa5 with decisive threats, e.g.

1a) … Nd5

Rd8+ Ke7

Rxc8 Bxc8

Qxc5+Kd8

Qd6 and mate next move

1b) Re8 Qxc5+

2) … Rxc5

Qa4 Bb5

Qxa7+ and mate to follow.

Of course black can give the Queen for the Knight on f6 Qa5 or Qa4, but white picks up too much material.

After 1. Qb4+, c5 (Kd8? 2. Qd6#) 2.dxc5 I see four possible black moves.

2.-, dxc5 3. Qxc5+!, Rxc5 and then Rd7+/Rd8+/Re8#

2.-, Rxc5 same mate even faster.

2.-, Nd5 3. Rxd5, exd5 4. cxb6+, Ke6 (Rc5 won’t help because Kd8 leads to mate on c7) 5. Qd6+, Kf5 6. Qd7+, Kg5 and 7. h4#

Sp let’s look at joshuas proposal: 2.-, Nc2 but then 3. Qa4 seems to win.

What shell black do against Qxa6 AND Qd7+ (with mate in the next move on d6). After 3.-, b5 4. Qxa6 black’s rook has no good field to go to (e.g. Ra8? 5. Qb7+) and Qh8 is not good because of 5. Rd7+ and 6. Qxc8# (same after Rh8…).

Have I overseen anything?

Jochen

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1. Qb4+! c5

2. dxc5 Nc2

(2…Nd5 3. Rxd5 exd5 4.c6+ Ke6 5. Qd6+ Kf5 6.Qd7+ Kg5 7.h4++; 2…bc5 3. Qxc5!+ Rxc5 4. Rd7+ Kf8 5.Rd8+ Ke7 6.Rd8++; 2…Rxc5 3.Rd7+ leads to mate; 2… Qxf6+ 3.cxb6+! Ke8 4.exf6 Bf8 5.Qa4+ is the end.)

3.Qa4 b5

4.Qxa6 is conclusive

King.

This comment has been removed by the author.

This comment has been removed by the author.

joshua, I think Qa4 winds efficiently after either

2. … Nc2

3. Qa4 b5

4. Qxa6 and mate in two

2. … Nd5 puts up more resistance:

3. Qa4 and then either

A: 3. … Bb7, with mate to follow: 4Qd7+ Kf8 5 Qd6+ Ne7 6 Qd8+ Rxd8 7 Rxd8++;

B: 3 … Kf8 4 Qxa6 Ne7 (4 … Rd8 transposes to C) 5 Qxc8+ Nxc8 6 Rd8+ Ke7 7 Re8++

C: 3 … Rd8

4 Qxa6 Kf8 (4 … Nc7 5 Rxd8 forces mate)

5 cxb6 axb6

6 Rxd5 exd5 (6 … Rxd5 7 Qc8+ Rd8 8 Qxd8++)

7 Qxb6 Qh8 (The alternatives are: 7 … Ke7 8 Qc5+ Rd6 9 Qxd6++ ;7 … Re8 8 Qd6+ and mate to follow)

8 Qxd8+ Kg7

9 Qxh8+ Kxh8

10 Nxd5 with an easily won endgame

dear anonymous,

the Nd5 line doesn’t end happily in mate:

2…Nd5 3. Rxd5 exd5 4.c6+ Ke6 5. Qd6+ Kf5 6.Qd7+ and now Kxe5, and I don’t see a win for white.

so instead of 3. Rxd5, 3. Qa4 wins (see previous post)

Qb4+ b5

dxb5 Nd5

Nxd5+ exd5

cxb6+

im having to retry this problem. i would try something like this trying to get my rook on d7. i dont think theres a mate to this problem. at first i thought there was but now i think white merly can gain some material and equalize. this problem was more difficult than at first glance.

Greetings,

There was a slight error in my last calculations, here is an improvement.

1.Qb4+! c5

2.dxc5 Nd5!?

(2…Nc2 3.Qa4 b5 4.Qxa6 is conclusive

2…bc5 3. Qxc5!+ Rxc5 4. Rd7+ Kf8 5.Rd8+ Ke7 6.Rd8++; 2…Rxc5 3.Rd7+ leads to mate; 2… Qxf6+ 3.cxb6+! Ke8 4.exf6 Bf8 5.Qa4+ is the end.)

3.Rxd5!

(3.Nxd5!? may also be reasonable as well but I feel 3.Rxd5 is interesting and may have something in it; but not 3.Qa4? which allows 3…Nxf6!)

3…exd5

4.cxb6+! (better than the 4.c6?! I suggested before)

4…Ke6

5.Qd6+ Kf5

6. Qxd5! (With the 3 threats of g4 leading to mate, Nd7 and e6+ and finally the passed ‘a’ pawn).

6…Bc1 (vacating h6) (6…Be2 7.bxa7 Qh8 8. Nd7! [with the threat of Nb8 and e6 is strong]

7.bxa7 Qh8 ( The position here is very unclear but the exposed nature of black’s king as well as the White Queen and Knight tandem plus the passed ‘a’ pawn should be sufficient compensation) I’m tired now and need to go to bed, I will resort to thorough analysis tomorrow.

My Regards

King.

Following King’s moves but:

5 Kf5

6 g4+, hxg4 (forced)

7 hxg4+

K can go to g5, f4, xe5, h4, e3etc

if Kf4, Qd4+ Kg5 (forced)

Qd2+, Kh4

Qf2+ Kg5

Qe3+ Kh4

Qg3+ Kg5 (K is trapped)

Ne4#