Weekly Endgame Study (154)

10 Responses to “Weekly Endgame Study (154)”

1. Sergio on February 2nd, 2010 16:14
   

   What happens if black plays 13 … c3+ ? To free his knight

   Or is an ending knight vs bishop knight also lost?
2. Martas on February 2nd, 2010 18:18
   

   13..c3+ 14.Kxa3 with won K+N+B vs K ending
3. xtreemmasheen3k2 on February 3rd, 2010 02:29
   

   I got:

   1. Bf3

   And am unsure how to continue, but it does White to queen his Pawn and at worst trade it off for another Queened Pawn, and prevents the H pawn from Queening.

   These are continuations I can think of:

   1. Bf3 h1=Q+
   2. Bxh1

   Bishop can’t be taken due to:

   2. Bxh1 Kxh1
   3. Ra4

   And the Pawn can’t queen due to:

   2. Bxh1 a1=Q
   3. h8=Q

   The Black Queen can’t take the White Queen due to :

   3. h8=Q Qxh8
   4. Re1+ Kf2
   5. Bxh8

   With the G and H pawns undefended and on Light squares, no matter what the Black King does (probably Kxe1), White will do 6. Be4 7. Bxg6 and 8. Kxh5, easily being able to Queen his last pawn. So the main idea in this Endgame Study is the fact that White can trade off 2 pieces (in this case, the Queen and the Rook) for Black’s Queen due to the fact that the G and H pawns are on Light squares, making them easy targets for White’s Light Bishop.

   Essentially, after 3. h8=Q, Black is in a lost position. Black has no checks available due to the Rook defending e1. However, if the Black Queen doesn’t move, Qxa1 will occur, so it has to move, and, as the example proved, the White Queen can’t be taken.

   The Queen can’t move along the 1st Rank to b1 or c1 due to:

   3. h8=Q Qb1 (or c1)
   4. Re4+. Pxe4 isn’t possible due to Qg2++. This will be followed up by Kf1 or Kf2. Both of which can be responded with:

   4. Re4+ Kf1 (or Kf2)
   5. Qf3+ Ke1
   6. Rg1+ Kd2
   7. Rxc1 and the Black Queen is lost.

   Qd1 follows:
   3. h8=Q Qd1
   4. Bf3

   And Qxf3 isn’t possible due to Re1+ and then White’s Qxf3.

   After this, there are a bunch of combinations that I’d rather not go into but have the same general idea, and most can be responded with 5. Qa7+.

   Essentially, there are many possible combinations following this, too many that I don’t care to list ALL of, but if anyone asks, I will tell them the combinations that result. If Black queens the A pawn first, it’s essentially the same thing, but I’ll simply respond to any questions of combinations anyone asks.
4. RRB on February 3rd, 2010 02:57
   

   simple

   1.Bf3 a1(Q) 2.a8(Q) h1(Q)+!!

   [ 2...Qxa8? 3.Re1+ Kf2 4.Ba8 Ke1 5.Kg3+-]

   3.Bxh1 Qxa8 4.Re1+ Kh2 5.Be4!!

   5…Qa1 6.Rb1!!+-
5. Sergio on February 3rd, 2010 12:57
   

   RRB what should wihite play if black doesn’t play 3 Qxa8, but instead plays Qf1, with the thread Qf2+ .. Qh2 #?

   On most moves i looked at Kxh1 is possible. Black will be a rook behind, but i don’t see a good continuation for white.
6. xtreemmasheen3k2 on February 4th, 2010 23:25
   

   Sergio:

   3. Bxh1 Qf1
   4. Qb8 OR Qa3…
   5. Qg3(+?)

   The whole point is to get the White Queen to 3. This blocks and Checks and blocks the Black king from moving. ON TOP of that, in addition to keeping the King on the 1st rank, it also allows for Re1, forcing Black to lose his Queen.

   MAYBE there’s a way out of one of 4. Qb8 OR Qa3, but if one doesn’t work, most likely the other will.
7. xtreemmasheen3k2 on February 4th, 2010 23:31
   

   *Thew hole point is to get the White Queen to g3.
8. justin on February 5th, 2010 17:09
   

   Kg3 looks like a very good spot to threaten back row mates. looks like a pattern for a-file h-file queening endgames.
9. cak on February 5th, 2010 21:42
   

   With all the extra material, even (1. Bf3 a1Q 2.a8Q h1Q+ 3. Bxh1 Qf1) 4. Rg4+ hxg4 5.Qg2+ is winning.
10. tensor on February 8th, 2010 05:15
    

    There is a subtlety in the third white move, because a check in e1 maybe is not winning, but anyway, more complicated for white if finally so results.

    1.Bf3 a1=Q 2.a8=Q Qxa8 3.Rg4+ hxg4 4.Bxa8 Kf2 5.Kxg4 Ke3 6.Kg3 Kd4 7.Kf4 Kc5 8.Ke5 Kb6 9.Kf6 and it’s over

    Sidelines:
    2… Qf1 3.Qa2
    2… h1=Q+ 3.Bxa1 Qxa8 4.Rxe1+ Kf2 5.Bxa8 Kxe1 6.Kg3 Ke2 7.Kf4 Kd3 8.Ke5 etc
    3… Kf2 4.Bxa8 hxg4 5.Kxg4 Ke3 6.Bb7 Kd4 7.Kf4 Kc5 8.Ke5 Kb6 9.Bg2 Kc7 10.Kf6 Kd7 11.Kxg6 Ke7 12.Kg7

    About the check in e1:
    3.Re1+ Kf2 4.Bxa8 Kxe1 5.Kg3 Kf1 6.Kf4 Kf2 7.Be4 Kg1 8.Ke5 h4 9.Kf6 h1=Q 10.Bxh1 Kxh1 11.Kxg6 h3 12.Kf6 h2 13.g6 Kg1 14.g7 h1=Q 15.g8=Q+ Qg2 and draw

    In this line, the only alternative for white seems to be 6.Kxh2 Kf2 7.Bc6 Ke3 8.Kh3 Kf4 9.Kh4 (protecting the g5 pawn, white’s trump card) Ke5 10.Be8 Kf5 11.Bf7 and white should win. I couldn’t find a line for black to avoid this.

    Obviously the safer winning line is the first one.

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