Solutions to our studies and problems

Solutions to the puzzles from the

In our previous report Yochanan Afek provided us with two spectacular studies from the Corus Study Day. The were published in The Problemist and we had permission to reproduce them.

It looks as though White has an easy draw, but after the obvious key you must look for a spectacular black counter-attack. White has to set up a very clever positional draw in order to save the day. Peter Murdzia (Poland), a strong over-the-board IM, is the current world champion solver. He could not attend the event this time and sent this lovely study with greetings instead.

Solution: 1.Bb5! 1.Rh1? Nxf2 2.Rxh2+ Kg3 and Black wins. Now it looks like White will obtain an easy draw, however Black comes up with an astonishing counter-attack. 1...Ra1!! 2.Rxa1 Nc1! 3.Rxc1 Bg5+

Afek presenting the solution to the Murdzia/Andzey study in Wijk aan Zee

Game over? Not quite! 4.f4!! Closing for a moment one diagonal, thus gaining precious time to open the longest one for the final combination. 4...Bxf4+ 5.Ke2 Bxc1 6.Ne5! h1Q 7.Bc6 Qh3 8.Bd7! Qg2 9.Bc6.

Draw. The black lady can find no refuge. A surprising positional draw! [The queen has no squares: if she moves to g1, h2 or g5 she will fall to a knight fork; if she moves to h3 the bishop attacks from d7; and on any other square she is simply taken.] [Click to replay]

This study by the legendary over-the-board Dutch grandmaster contains an very beautiful pawn sacrifice, the purpose of which only becomes apparent at the end of the winning line.

Solution: 1.Rd1 a3! To create threats along the fourth rank. 2.bxa3 Ra4+

3.f4!! The significance of this sacrifice will become apparent only on the last move. If 3.Kg3? then 3...Rd4! saves Black. 3...Rxf4+ 4.Kg3 Rd4! 5.Rxd4! e2

6.Rd6+! Kh7. 6...cxd6 7.Ba5 wins for White. 7.Rh6+! Kxh6 8.Bg5+! Kxg5

After sacrificing the pawn on move three, and then all his pieces, White now provides us with the point of the entire magnificent combination: 9.f4+! There follows 10.Kf2 and White wins. 1-0. This was one of the two beautiful studies composed by Jan Timman especially for this event. [Click to replay]

There is one more beautiful Reti-Memorial study, composed by Yochanan Afek, that we are waiting to show you. But it needs to be published in a problem magazine and submitted for competition first.

Solutions to the problems from the
2009 British Problem Solving Championship

Solution: The main line runs 1.e7 Nh6+ 2.Kg6 Ng8 (In the British Problem Solving Championship Piotr Murdzia incorrectly gave 2...Bh5+ 3 Kxh5 Ng8, which loses trivially after 4 Be6+) 3.Be6+ Kd6 4.e8Q (4.e8R is equally good) 4...Bh5+ 5 Kxh5 Nf6+ 6 Kg6 Nxe8 7 Kf7 Nc7 8 Ne4#. [Click to replay]

In a helpmate, Black moves first and both sides cooperate to help White mate Black. In a helpmate in six, this mate takes place on White’s sixth move (thus both sides play six moves). In the second part of the problem, you have to move the black queen from a3 to e8 and again find a helpmate in six. The solvers found this problem one of the hardest in the competition and only the two over-the-board GMs managed to solve it completely.

Solution:

[Click to replay]

This was the most attractive problem used in the event. In order to get full marks the solvers had to give the key, the threat, and all variations in which Black can delay mate until White’s fourth move. All lines had to be given up to White’s third move. Five points were available for this problem, divided up as follows:

Black’s two main defences are 1...Nf3 and 1...Nd3, which are dealt with as follows:

These two defences were both refuted the same way. In each case, Black’s first move blocked a square which his king would need in the future. In both lines, White sacrificed a piece to create a second block for the king; these sacrificial moves involved the white piece crossing the square on which White would give a check on the third move.

There were two less important lines which, however, still had to be given for full marks:

[Click to replay]

Click for crop from original plate (well, actually from the original JPG)

For today's astronomy picture, we travel a bit further from home, eleven million light-years to be precise (or in fact imprecise, as the distance is not known to any great accuracy). This is the galaxy M82, sometimes known as the Cigar Galaxy. The irregular knots and dark lines visible in the photograph show that something is happening in M82, and a Hubble picture shows more clearly that there are great jets of dust and gas streaming out of the centre of M82. The reason for this is that in the recent past (which here means about 600 million years ago) M82 nearly collided with the massive spiral galaxy M81. The gravitational pull of M81 disrupted M82's structure and triggered a massive burst of star formation, the effects of which we can still see today. The above picture was made using my 10 inch Meade LX200 GPS telescope. – John Nunn.

Links

• Twan Burg wins Corus study competition
• Corus Study Day – solution and new puzzles
• British Chess Problem Solving Championship